<div>
  <h2>Addition</h2>
  <p>
    Addition is a fundamental arithmetic operation that combines two or more values to produce a sum. In programming, addition is commonly used to add numerical values together.
  </p>
  <h3>Syntax</h3>
  <p>
    The syntax for addition in most programming languages is straightforward. It typically involves using the plus symbol (+) between the values you want to add.
  </p>
  <pre>
    <code>
      value1 + value2
    </code>
  </pre>
  <h3>Examples</h3>
  <p>
    Here are some examples of addition in different programming languages:
  </p>
  <ul>
    <li>Python: <code>3 + 5</code> evaluates to <code>8</code></li>
    <li>JavaScript: <code>10 + 2</code> evaluates to <code>12</code></li>
    <li>C++: <code>7 + 4</code> evaluates to <code>11</code></li>
  </ul>
  <h3>Properties</h3>
  <p>
    Addition has several properties that make it a useful operation in programming:
  </p>
  <ul>
    <li><strong>Commutative Property:</strong> The order of the values being added does not affect the result. For example, <code>2 + 3</code> is the same as <code>3 + 2</code>.</li>
    <li><strong>Associative Property:</strong> The grouping of values being added does not affect the result. For example, <code>(2 + 3) + 4</code> is the same as <code>2 + (3 + 4)</code>.</li>
    <li><strong>Identity Element:</strong> Adding zero to any value does not change the value. For example, <code>5 + 0</code> is <code>5</code>.</li>
  </ul>
</div>

Addition in programming refers to the process of combining two or more values together. This operation is commonly used to perform calculations or concatenate strings. In programming languages, addition is represented by the plus sign (+) and can be applied to numerical values, variables, or even arrays. Understanding how addition works is essential for writing efficient and accurate code in various programming tasks.

<div>
  <h2>Subtraction</h2>
  <p>Subtraction is a binary arithmetic operation that finds the difference between two numbers. In programming, subtraction is commonly used to subtract one number from another.</p>
  
  <h3>Syntax</h3>
  <p>The syntax for subtraction in most programming languages is:</p>
  <pre>
    <code>result = number1 - number2;</code>
  </pre>
  
  <h3>Example</h3>
  <p>For example, if we have two variables <code>num1 = 10</code> and <code>num2 = 5</code>, then <code>result = num1 - num2</code> will result in <code>5</code>.</p>
  
  <h3>Properties</h3>
  <ul>
    <li>Subtraction is not commutative, meaning that changing the order of the numbers will result in a different outcome.</li>
    <li>Subtraction can result in negative numbers if the second number is greater than the first number.</li>
  </ul>
</div>

Subtraction is a mathematical operation commonly used in programming to subtract one value from another. In programming languages, subtraction can be performed on numerical data types such as integers and floating-point numbers. The result of a subtraction operation is typically a new value that represents the difference between the two operands. Subtraction can also be used in more complex expressions and algorithms to manipulate data and perform calculations.

<div>
  <h2>Multiplication</h2>
  <p>Multiplication is a basic arithmetic operation that involves combining two or more numbers to find their product. In programming, multiplication is denoted by the asterisk (*) symbol.</p>
  
  <h3>Example:</h3>
  <p>If we want to multiply two numbers, say 5 and 3, the expression would look like this:</p>
  <pre>5 * 3</pre>
  
  <h3>Properties of Multiplication:</h3>
  <ul>
    <li><strong>Commutative Property:</strong> The order of the numbers does not affect the result of multiplication. For example, 5 * 3 is the same as 3 * 5.</li>
    <li><strong>Associative Property:</strong> The grouping of numbers does not affect the result of multiplication. For example, (2 * 3) * 4 is the same as 2 * (3 * 4).</li>
    <li><strong>Distributive Property:</strong> Multiplication distributes over addition. For example, 2 * (3 + 4) is the same as (2 * 3) + (2 * 4).</li>
  </ul>
  
  <h3>Usage in Programming:</h3>
  <p>Multiplication is commonly used in programming for various tasks such as calculating areas, volumes, and scaling values. It is an essential operation in mathematical computations and algorithms.</p>
</div>

In programming, multiplication is a mathematical operation that involves multiplying two numbers together. This operation is commonly used in expressions to calculate the product of two values. Multiplication can be performed using the asterisk (*) symbol in most programming languages, such as Python, Java, and C++. It is an essential operation in programming for performing calculations and manipulating numerical data.

<div>
  <h2>Division</h2>
  <p>Division is a mathematical operation that involves splitting a number into equal parts. In programming, division is used to divide one number by another to get the quotient.</p>
  
  <h3>Integer Division</h3>
  <p>Integer division is when the result of the division operation is an integer. Any decimal part of the result is truncated, meaning it is not rounded up or down, but simply removed.</p>
  
  <h3>Floating-Point Division</h3>
  <p>Floating-point division is when the result of the division operation includes decimal points. This type of division is more precise and is commonly used when dealing with non-integer numbers.</p>
  
  <h3>Division by Zero</h3>
  <p>Dividing by zero is not allowed in mathematics and programming. It results in an error called division by zero error, which can crash the program or produce unexpected results.</p>
  
  <h3>Example:</h3>
  <p>If we divide 10 by 3:</p>
  <p>Integer division: 10 / 3 = 3</p>
  <p>Floating-point division: 10.0 / 3.0 = 3.3333333333333335</p>
</div>

Division is a mathematical operation commonly used in programming to divide one number by another. In programming languages, division can be performed using the "/" symbol. It is important to note that division in programming may result in different outcomes depending on the data types of the numbers being divided. For example, dividing two integers may result in a different value compared to dividing two floating-point numbers.

<div>
  <h2>Modulus</h2>
  <p>The modulus operator, denoted by %, returns the remainder of a division operation. It is used in arithmetic expressions to find the remainder when one number is divided by another.</p>
  
  <h3>Syntax</h3>
  <p>The syntax for the modulus operator is:</p>
  <pre>
    <code>result = dividend % divisor;</code>
  </pre>
  
  <h3>Example</h3>
  <p>For example, if we have:</p>
  <pre>
    <code>int dividend = 10;</code>
    <code>int divisor = 3;</code>
    <code>int result = dividend % divisor;</code>
  </pre>
  <p>The value of result will be 1, as 10 divided by 3 leaves a remainder of 1.</p>
  
  <h3>Usage</h3>
  <p>The modulus operator is commonly used in programming for tasks such as checking if a number is even or odd, generating random numbers within a specific range, and implementing cyclic patterns.</p>
</div>

The modulus operator in programming is used to find the remainder of a division operation. It is denoted by the percentage symbol (%) and is commonly used in mathematical calculations. The modulus operator is particularly useful when working with loops or conditions that require checking for even or odd numbers. It can also be used to determine if a number is divisible by another number.

<div>
  <h2>Increment</h2>
  <p>
    In programming, an increment operation is used to increase the value of a variable by a specified amount. The most common increment operation is the unary increment operator (++), which adds 1 to the current value of the variable.
  </p>
  <p>
    The increment operator can be used in two ways: pre-increment and post-increment. In pre-increment, the value of the variable is incremented before it is used in an expression. In post-increment, the value of the variable is used in an expression before it is incremented.
  </p>
  <p>
    Here is an example of pre-increment and post-increment:
  </p>
  <pre>
    int x = 5;
    int y = ++x; // pre-increment, x is incremented to 6 before assigning to y
    int z = x++; // post-increment, x is assigned to z (5) before being incremented to 6
  </pre>
  <p>
    It is important to note that the increment operator can only be used with variables, not with constants or expressions. Additionally, the increment operation can be combined with other arithmetic operations to perform more complex calculations.
  </p>
</div>

Increment is a type of expression in programming that is used to increase the value of a variable by a specified amount. It is commonly denoted by the '++' operator and is often used in loops and other situations where a variable needs to be incremented by one. Increment can be used both as a prefix (++i) or postfix (i++) operation, with the main difference being when the increment actually takes place in the code execution.

<div>
  <h2>Decrement</h2>
  <p>In programming, decrement is an operation that decreases the value of a variable by 1. It is the opposite of increment, which increases the value by 1.</p>
  
  <h3>Syntax</h3>
  <p>The syntax for decrement varies depending on the programming language. In most languages, the decrement operator is represented by '--' placed before or after the variable.</p>
  
  <h3>Examples</h3>
  <p>Here are some examples of decrement in different programming languages:</p>
  <ul>
    <li>C/C++: <code>int x = 5; x--;</code></li>
    <li>Java: <code>int y = 10; y--;</code></li>
    <li>Python: <code>z = 15; z -= 1</code></li>
  </ul>
  
  <h3>Usage</h3>
  <p>Decrement is commonly used in loops and other situations where you need to decrease the value of a variable by 1. It can also be used to simplify code and make it more readable.</p>
</div>

Decrement is an operation in programming that involves decreasing the value of a variable by a specified amount. This is commonly done using the decrement operator (--), which subtracts 1 from the variable's current value. Decrementing a variable is useful in situations where you need to decrease a value by a fixed amount, such as in loops or calculations. It is the opposite of incrementing, which involves increasing the value of a variable.

<div>
  <h2>Arithmetic Expressions</h2>
  <p>Arithmetic expressions are used in programming to perform mathematical calculations. These expressions can involve various arithmetic operators such as addition, subtraction, multiplication, and division.</p>
  
  <h3>Addition</h3>
  <p>The addition operator (+) is used to add two or more values together. For example, <code>5 + 3</code> will result in <code>8</code>.</p>
  
  <h3>Subtraction</h3>
  <p>The subtraction operator (-) is used to subtract one value from another. For example, <code>10 - 4</code> will result in <code>6</code>.</p>
  
  <h3>Multiplication</h3>
  <p>The multiplication operator (*) is used to multiply two values together. For example, <code>2 * 6</code> will result in <code>12</code>.</p>
  
  <h3>Division</h3>
  <p>The division operator (/) is used to divide one value by another. For example, <code>8 / 2</code> will result in <code>4</code>.</p>
  
  <h3>Order of Operations</h3>
  <p>Arithmetic expressions follow the standard order of operations, which dictates the sequence in which operations are performed. The order is as follows:</p>
  <ol>
    <li>Parentheses</li>
    <li>Exponents</li>
    <li>Multiplication and Division (from left to right)</li>
    <li>Addition and Subtraction (from left to right)</li>
  </ol>
</div>

Arithmetic expressions in programming are used to perform mathematical calculations. These expressions consist of operands (variables or values) and operators (such as addition, subtraction, multiplication, and division) that dictate how the operands are combined. The result of an arithmetic expression is a single value that represents the outcome of the calculation. Understanding how to construct and evaluate arithmetic expressions is essential for writing efficient and accurate code in programming languages.

<div>
  <h2>AND Operator</h2>
  <p>The AND operator is a logical operator that combines two Boolean expressions and returns true only if both expressions are true. In programming, the AND operator is represented by the symbol <code>&amp;&amp;</code>.</p>
  
  <h3>Syntax</h3>
  <p>The syntax for the AND operator is as follows:</p>
  <pre><code>expression1 && expression2</code></pre>
  
  <h3>Truth Table</h3>
  <table>
    <tr>
      <th>Expression 1</th>
      <th>Expression 2</th>
      <th>Result</th>
    </tr>
    <tr>
      <td>true</td>
      <td>true</td>
      <td>true</td>
    </tr>
    <tr>
      <td>true</td>
      <td>false</td>
      <td>false</td>
    </tr>
    <tr>
      <td>false</td>
      <td>true</td>
      <td>false</td>
    </tr>
    <tr>
      <td>false</td>
      <td>false</td>
      <td>false</td>
    </tr>
  </table>
  
  <h3>Example</h3>
  <p>Consider the following example:</p>
  <pre><code>var x = true;
var y = false;
var result = x && y; // result is false</code></pre>
  
  <p>In this example, the result of the AND operation between <code>x</code> and <code>y</code> is <code>false</code> because one of the expressions is false.</p>
</div>

The 'AND' operator is a logical operator used in programming to combine two conditions. It returns true only if both conditions are true. In many programming languages, the 'AND' operator is represented by symbols such as '&&' or 'and'. Using the 'AND' operator allows for more complex conditional statements to be created, helping to control the flow of a program based on multiple conditions.

<div>
  <h2>OR Operator</h2>
  <p>The OR operator is a logical operator that returns true if at least one of the operands is true. It is denoted by the symbol ||.</p>
  
  <h3>Syntax</h3>
  <p>operand1 || operand2</p>
  
  <h3>Truth Table</h3>
  <table>
    <tr>
      <th>operand1</th>
      <th>operand2</th>
      <th>Result</th>
    </tr>
    <tr>
      <td>true</td>
      <td>true</td>
      <td>true</td>
    </tr>
    <tr>
      <td>true</td>
      <td>false</td>
      <td>true</td>
    </tr>
    <tr>
      <td>false</td>
      <td>true</td>
      <td>true</td>
    </tr>
    <tr>
      <td>false</td>
      <td>false</td>
      <td>false</td>
    </tr>
  </table>
  
  <h3>Example</h3>
  <p>if (x > 5 || y < 10) {<br>
    &nbsp;&nbsp;// code block to be executed if x is greater than 5 or y is less than 10<br>
  }</p>
</div>

The OR operator is a logical operator used in programming to combine two conditions. It returns true if at least one of the conditions is true, otherwise it returns false. This operator is commonly used in conditional statements and loops to create more complex logic. In many programming languages, the OR operator is represented by the symbol ||.

<div>
  <h2>NOT Operator</h2>
  <p>The NOT operator is a logical operator that negates the value of a boolean expression. It is denoted by the exclamation mark (!) symbol.</p>
  
  <h3>Syntax</h3>
  <p>The syntax for the NOT operator is:</p>
  <pre>
    <code>!expression</code>
  </pre>
  
  <h3>Behavior</h3>
  <p>When the NOT operator is applied to a boolean expression, it returns the opposite boolean value. If the expression is true, the NOT operator will return false. If the expression is false, the NOT operator will return true.</p>
  
  <h3>Example</h3>
  <p>Consider the following example:</p>
  <pre>
    <code>boolean isSunny = true;
boolean isRainy = !isSunny; // isRainy will be false</code>
  </pre>
</div>

The 'NOT' operator in programming is a logical operator that negates the value of a boolean expression. It is used to reverse the logical state of its operand, making true expressions false and false expressions true. This operator is commonly used in conjunction with other logical operators to create complex conditions and control flow in programs. The 'NOT' operator is essential for implementing decision-making processes and ensuring the correct execution of code based on specific conditions.

<div>
  <h1>Logical (Boolean) Expressions</h1>
  <p>Logical expressions in programming are used to evaluate conditions and make decisions based on the result. These expressions typically return a boolean value, which is either true or false.</p>
  
  <h2>Types of Logical Operators</h2>
  <ul>
    <li><strong>AND Operator (&&):</strong> Returns true if both operands are true.</li>
    <li><strong>OR Operator (||):</strong> Returns true if at least one of the operands is true.</li>
    <li><strong>NOT Operator (!):</strong> Returns the opposite boolean value of the operand.</li>
  </ul>
  
  <h2>Examples of Logical Expressions</h2>
  <p>Here are some examples of logical expressions:</p>
  <ul>
    <li><code>(x > 5) && (y < 10)</code></li>
    <li><code>(a == b) || (c != d)</code></li>
    <li><code>!(isTrue)</code></li>
  </ul>
  
  <h2>Combining Logical Expressions</h2>
  <p>Logical expressions can be combined using parentheses to create more complex conditions. For example:</p>
  <ul>
    <li><code>((x > 5) && (y < 10)) || (z == 0)</code></li>
  </ul>
</div>

Logical (Boolean) expressions are used in programming to evaluate conditions as either true or false. These expressions typically involve logical operators such as AND, OR, and NOT to combine multiple conditions. They are essential for controlling the flow of a program by making decisions based on the outcome of these evaluations. Understanding how to construct and use logical expressions is fundamental for writing efficient and effective code.

<div>
  <h2>Equal to</h2>
  <p>
    The equal to operator (==) is used to compare two values to see if they are equal. If the values are equal, the expression evaluates to true; otherwise, it evaluates to false.
  </p>
  <p>
    In most programming languages, the equal to operator is used for comparing values of the same data type. For example, in JavaScript, the expression 5 == 5 would evaluate to true, while the expression '5' == 5 would evaluate to false because the values are of different data types.
  </p>
  <p>
    It is important to note that the equal to operator only checks for equality of values, not data types. If you need to check for both value and data type equality, you can use the strict equal to operator (===).
  </p>
</div>

The 'Equal to' operator in programming is used to compare two values to see if they are equal. It is denoted by the double equals sign (==). When the 'Equal to' operator is used, it returns a boolean value of true if the values are equal, and false if they are not. This operator is commonly used in conditional statements and loops to control the flow of a program based on the comparison of values.

<div>
  <h2>Not Equal To</h2>
  <p>The not equal to operator (!=) is used to compare two values and return true if they are not equal, and false if they are equal.</p>
  <p>For example, in the expression 5 != 3, the result would be true because 5 is not equal to 3.</p>
  <p>The not equal to operator can be used with different data types, such as numbers, strings, and booleans.</p>
  <p>When using the not equal to operator with strings, it compares the actual values of the strings, not their memory locations.</p>
  <p>It is important to note that the not equal to operator is different from the strict not equal to operator (!==), which also checks for data type equality.</p>
</div>

In programming, the 'not equal to' operator is used to compare two values and determine if they are not equal. This operator is denoted by '!=' in most programming languages. When the 'not equal to' operator is used, it returns a boolean value of true if the two values being compared are not equal, and false if they are equal. This operator is commonly used in conditional statements and loops to make decisions based on whether two values are not equal.

<div>
  <h2>Greater than</h2>
  <p>In programming, the greater than operator (<code>&gt;</code>) is used to compare two values. It returns <code>true</code> if the value on the left is greater than the value on the right, otherwise it returns <code>false</code>.</p>
  
  <h3>Examples:</h3>
  <ul>
    <li><code>5 &gt; 3</code> is <code>true</code></li>
    <li><code>10 &gt; 20</code> is <code>false</code></li>
  </ul>
  
  <p>The greater than operator can be used with numbers, strings, and other data types depending on the programming language.</p>
</div>

In programming, 'greater than' is a comparison operator used to evaluate if one value is larger than another. It is commonly used in conditional statements and loops to make decisions based on the comparison result. The symbol for 'greater than' is '>'. When the expression on the left side of the operator is greater than the expression on the right side, the result is true.

<div>
  <h2>Less Than</h2>
  <p>In programming, the less than operator (<) is used to compare two values. It returns true if the value on the left is less than the value on the right, otherwise it returns false.</p>
  <p>For example, in the expression 5 < 10, the result would be true because 5 is less than 10.</p>
  <p>The less than operator can be used with various data types such as numbers, strings, and even objects.</p>
  <p>When comparing strings, the comparison is done based on the Unicode values of the characters in the strings.</p>
  <p>It is important to note that the less than operator is a binary operator, meaning it requires two operands to perform the comparison.</p>
</div>

In programming, 'Less than' is a comparison operator used to check if the value on the left side of the operator is smaller than the value on the right side. It is commonly used in conditional statements and loops to make decisions based on the comparison result. For example, in an if statement, the 'Less than' operator can be used to execute a block of code only if a certain condition is met. It is represented by the symbol '<' in most programming languages.

<div>
  <h2>Greater than or equal to (>=)</h2>
  <p>
    The greater than or equal to operator (>=) is a relational operator used to compare two values. It returns true if the left operand is greater than or equal to the right operand, otherwise it returns false.
  </p>
  <p>
    In programming, the greater than or equal to operator is commonly used in conditional statements and loops to make decisions based on the comparison of two values.
  </p>
  <p>
    Example:
  </p>
  <pre>
    <code>
      int a = 5;
      int b = 3;
      if (a >= b) {
        System.out.println("a is greater than or equal to b");
      } else {
        System.out.println("a is less than b");
      }
    </code>
  </pre>
</div>

In programming, 'greater than or equal to' is a comparison operator used to evaluate if one value is greater than or equal to another value. This operator is commonly used in conditional statements to make decisions based on the comparison result. For example, in an if statement, the 'greater than or equal to' operator can be used to determine if a certain condition is met before executing a block of code. It is represented by the symbol '>='.

<div>
  <h2>Less than or equal to (<=)</h2>
  <p>The less than or equal to operator (<=) is a relational operator used to compare two values. It returns true if the left operand is less than or equal to the right operand, otherwise it returns false.</p>
  
  <h3>Syntax:</h3>
  <p><code>value1 <= value2</code></p>
  
  <h3>Examples:</h3>
  <p><code>5 <= 10</code> // true</p>
  <p><code>10 <= 5</code> // false</p>
  <p><code>5 <= 5</code> // true</p>
  
  <h3>Usage:</h3>
  <p>The less than or equal to operator is commonly used in conditional statements and loops to compare values and make decisions based on the result of the comparison.</p>
</div>

In programming, 'less than or equal to' is a comparison operator used to evaluate if one value is less than or equal to another value. It is commonly represented as '<=' in most programming languages. This operator is useful for making decisions in conditional statements and loops based on the relationship between two values. By using 'less than or equal to', programmers can create more dynamic and flexible code that can handle a variety of scenarios.

<div>
  <h1>Relational Expressions</h1>
  <p>Relational expressions are used in programming to compare two values and determine the relationship between them. These expressions typically return a boolean value (true or false) based on the comparison result.</p>
  
  <h2>Common Relational Operators</h2>
  <ul>
    <li>Equal to (==): Compares if two values are equal.</li>
    <li>Not equal to (!=): Compares if two values are not equal.</li>
    <li>Greater than (>): Checks if one value is greater than the other.</li>
    <li>Less than (<): Checks if one value is less than the other.</li>
    <li>Greater than or equal to (>=): Checks if one value is greater than or equal to the other.</li>
    <li>Less than or equal to (<=): Checks if one value is less than or equal to the other.</li>
  </ul>
  
  <h2>Examples of Relational Expressions</h2>
  <p>Here are some examples of relational expressions in different programming languages:</p>
  
  <h3>JavaScript</h3>
  <pre>
    <code>
      let a = 5;
      let b = 10;
      console.log(a < b); // Output: true
    </code>
  </pre>
  
  <h3>Python</h3>
  <pre>
    <code>
      a = 5
      b = 10
      print(a == b) # Output: false
    </code>
  </pre>
  
  <h3>C++</h3>
  <pre>
    <code>
      int a = 5;
      int b = 10;
      cout << (a >= b); // Output: false
    </code>
  </pre>
</div>

Relational expressions are used in programming to compare two values and determine their relationship, such as equality, inequality, greater than, less than, etc. These expressions typically return a boolean value of true or false based on the comparison result. Relational expressions are commonly used in conditional statements and loops to control the flow of a program based on certain conditions. Understanding how to use relational expressions effectively is essential for writing efficient and logical code.

<div>
  <h2>Simple Assignment</h2>
  <p>In programming, a simple assignment is the basic operation of storing a value in a variable. It involves using the assignment operator (=) to assign a value to a variable.</p>
  <p>For example, in Python:</p>
  <pre>
    <code>
      x = 10
      name = "John"
    </code>
  </pre>
  <p>In the above examples, the value 10 is assigned to the variable x, and the string "John" is assigned to the variable name.</p>
  <p>Simple assignments can also involve expressions on the right-hand side:</p>
  <pre>
    <code>
      y = x + 5
      total = count * price
    </code>
  </pre>
  <p>Here, the value of x plus 5 is assigned to y, and the result of count multiplied by price is assigned to total.</p>
</div>

A simple assignment in programming involves assigning a value to a variable using the equal sign (=) operator. This type of expression is used to store data in a variable for later use in the program. Simple assignments are fundamental in programming and are used to manipulate data and perform calculations. Understanding how to properly use simple assignments is essential for writing efficient and effective code.

<div>
  <h2>Add AND</h2>
  <p>
    The Add AND assignment expression is used to add the value of the right operand to the value of the left operand and assign the result to the left operand. It is represented by the operator <code>+=</code>.
  </p>
  <p>
    For example, if we have a variable <code>x</code> with a value of 5, the expression <code>x += 3</code> will add 3 to the value of <code>x</code> and assign the result (8) back to <code>x</code>.
  </p>
  <p>
    This is a shorthand way of writing <code>x = x + 3</code> and is commonly used to increment the value of a variable by a specific amount.
  </p>
</div>

The 'Add AND' operator is used in programming to combine two expressions together. It is commonly used in conditional statements to check if both expressions are true. The 'Add AND' operator requires both expressions to be true in order for the overall expression to be true. This allows for more complex logic to be implemented in programs by requiring multiple conditions to be met simultaneously.

<div>
  <h2>Subtract AND</h2>
  <p>The subtract AND assignment operator (-=) subtracts the value of the right operand from a variable and assigns the result to the variable.</p>
  <p>For example:</p>
  <pre>
    <code>
      int x = 10;
      x -= 5; // x is now 5
    </code>
  </pre>
  <p>This is equivalent to writing:</p>
  <pre>
    <code>
      int x = 10;
      x = x - 5; // x is now 5
    </code>
  </pre>
</div>

The Subtract AND operator in programming is used to subtract the value of the right operand from the value of the left operand and then assign the result to the left operand. This operator is commonly used in bitwise operations to perform subtraction and assignment in a single step. It is represented by the symbol "-=" in most programming languages. Using the Subtract AND operator can help streamline code and make it more concise and efficient.

<div>
  <h2>Multiply AND</h2>
  <p>The multiply AND assignment operator (*=) multiplies the value of the left operand with the value of the right operand and assigns the result to the left operand.</p>
  <p>For example:</p>
  <pre>
    <code>
      let x = 5;
      x *= 2; // equivalent to x = x * 2;
      // Now x is 10
    </code>
  </pre>
  <p>The multiply AND operator can be used with any numeric data type, such as integers, floats, and doubles.</p>
</div>

The 'Multiply AND' operator in programming is used to perform a bitwise multiplication operation on two expressions. It multiplies each bit of the first expression with the corresponding bit of the second expression. If both bits are 1, the result is 1; otherwise, it is 0. This operator is commonly used in bitwise operations to manipulate individual bits within binary numbers.

<div>
  <h2>Divide AND</h2>
  <p>The divide AND assignment operator (/=) divides the value of the left operand by the value of the right operand and assigns the result to the left operand.</p>
  <p>For example:</p>
  <pre>
    <code>
      int x = 10;
      int y = 2;
      x /= y; // x is now 5
    </code>
  </pre>
  <p>This is equivalent to:</p>
  <pre>
    <code>
      int x = 10;
      int y = 2;
      x = x / y; // x is now 5
    </code>
  </pre>
</div>

The 'Divide AND' expression in programming is used to divide two values and return the result only if both conditions are true. This means that both operands must be non-zero for the expression to evaluate to true. If either operand is zero, the expression will return false. This type of expression is commonly used in conditional statements and logical operations to ensure that both conditions are met before proceeding with the code execution.

<div>
  <h2>Modulus AND</h2>
  <p>The modulus AND operator (%) returns the remainder of a division operation. It is used to find the remainder when one number is divided by another.</p>
  <p>For example, 10 % 3 will return 1 because 10 divided by 3 is 3 with a remainder of 1.</p>
  <p>The modulus AND operator is often used in programming to perform tasks such as checking if a number is even or odd, or to cycle through a set of values.</p>
</div>

The Modulus AND operator in programming is used to calculate the remainder of a division operation and then perform a bitwise AND operation. This operator is commonly used in bitwise operations to check if a number is divisible by another number and to perform specific tasks based on the result. The Modulus AND operator can be useful in scenarios where you need to perform calculations involving both division and bitwise operations simultaneously.

<div>
  <h2>Assignment Expressions</h2>
  <p>An assignment expression is a statement in programming that assigns a value to a variable. It is used to store data in memory for later use. In most programming languages, the assignment operator is denoted by the equals sign (=).</p>
  
  <h3>Syntax</h3>
  <p>The syntax for an assignment expression is as follows:</p>
  <pre>
    <code>variable = value;</code>
  </pre>
  
  <h3>Examples</h3>
  <p>Here are some examples of assignment expressions in different programming languages:</p>
  <ul>
    <li>Python: <code>x = 10</code></li>
    <li>Java: <code>int y = 5;</code></li>
    <li>C++: <code>float z = 3.14;</code></li>
  </ul>
  
  <h3>Rules</h3>
  <p>There are a few rules to keep in mind when using assignment expressions:</p>
  <ul>
    <li>The variable being assigned must be declared before it can be assigned a value.</li>
    <li>The value being assigned must be of the same data type as the variable.</li>
    <li>Assignment expressions can be chained together, such as <code>x = y = z = 0;</code></li>
  </ul>
  
  <h3>Conclusion</h3>
  <p>Assignment expressions are a fundamental concept in programming that allow developers to store and manipulate data efficiently. Understanding how to use assignment expressions is crucial for writing effective and efficient code.</p>
</div>

Assignment expressions are a type of expression in programming that allows for the assignment of a value to a variable within an expression. This can help streamline code by combining the assignment and evaluation of a value in a single step. Assignment expressions are commonly used in languages like Python, where they are denoted by the ":=" operator. This feature can make code more concise and readable, especially in situations where a variable needs to be assigned a value based on a condition.

<div>
  <h2>Concatenation</h2>
  <p>Concatenation is the process of combining two or more strings into a single string. In programming, concatenation is often used to join strings together to create a new string.</p>
  
  <h3>Concatenation Operator</h3>
  <p>In most programming languages, the concatenation operator is represented by the plus sign (+). For example, in JavaScript:</p>
  <pre>
    <code>
      var str1 = "Hello";
      var str2 = "World";
      var result = str1 + " " + str2; // result will be "Hello World"
    </code>
  </pre>
  
  <h3>Concatenating Variables and Constants</h3>
  <p>Strings can be concatenated with variables, constants, or even other expressions. For example:</p>
  <pre>
    <code>
      var name = "Alice";
      var greeting = "Hello, " + name + "!";
    </code>
  </pre>
  
  <h3>Concatenating with Functions</h3>
  <p>Strings can also be concatenated with the result of functions. For example:</p>
  <pre>
    <code>
      function getGreeting(name) {
        return "Hello, " + name + "!";
      }
      
      var greeting = getGreeting("Bob");
    </code>
  </pre>
</div>

Concatenation is a process in programming where two or more strings are combined to form a single string. This operation is commonly used to join text or data together. In many programming languages, concatenation is achieved using the plus (+) operator. It allows for dynamic creation of strings by combining different pieces of information.

<div>
  <h2>Substring</h2>
  <p>A substring is a contiguous sequence of characters within a string. It is a common operation in programming to extract a substring from a larger string based on a specified starting index and length.</p>
  
  <h3>Syntax</h3>
  <p>The syntax for extracting a substring varies depending on the programming language, but it generally involves specifying the starting index and optionally the length of the substring. For example:</p>
  <ul>
    <li><code>substring(startIndex, length)</code> in Java</li>
    <li><code>substr(startIndex, length)</code> in JavaScript</li>
    <li><code>slice(startIndex, endIndex)</code> in Python</li>
  </ul>
  
  <h3>Example</h3>
  <p>Consider the string <code>"Hello, World!"</code>. If we want to extract the substring <code>"World"</code> starting from index 7, we can use the following code:</p>
  <pre>
    <code>
      String str = "Hello, World!";
      String sub = str.substring(7, 5);
      System.out.println(sub); // Output: World
    </code>
  </pre>
  
  <h3>Use Cases</h3>
  <p>Substrings are commonly used in tasks such as parsing data, manipulating text, and extracting specific information from strings. They provide a flexible way to work with text data in programming.</p>
</div>

A substring is a sequence of characters within a larger string. In programming, substrings are commonly used to extract specific portions of text from a string. This can be useful for tasks such as parsing data or manipulating strings. Substrings are typically specified by providing the starting index and the length of characters to extract.

<div>
  <h2>String Comparison</h2>
  <p>String comparison is a common operation in programming where two strings are compared to determine if they are equal or not. There are several ways to compare strings in programming languages:</p>
  
  <h3>1. Equality Comparison</h3>
  <p>One of the most common ways to compare strings is to check if they are equal. This is done by comparing each character in the strings to see if they match exactly.</p>
  
  <h3>2. Case Insensitive Comparison</h3>
  <p>Some programming languages provide functions or methods to compare strings in a case-insensitive manner. This means that the comparison will ignore the case of the characters in the strings.</p>
  
  <h3>3. Lexicographical Comparison</h3>
  <p>Strings can also be compared lexicographically, which means comparing them based on their alphabetical order. This type of comparison is useful for sorting strings.</p>
  
  <h3>4. Substring Comparison</h3>
  <p>Another type of comparison is to check if one string is a substring of another. This can be useful for searching for specific patterns within strings.</p>
</div>

String comparison in programming involves comparing two strings to determine if they are equal or not. This is commonly done using operators such as == or !=. String comparison is important for tasks such as sorting, searching, and filtering data in programs. It is crucial to understand how string comparison works in order to effectively manipulate and analyze text data in programming.

<div>
  <h2>String Length</h2>
  <p>In programming, the length of a string refers to the number of characters in the string. It is a common operation to determine the length of a string in order to perform various tasks such as validation, manipulation, or formatting.</p>
  
  <h3>Methods to Get String Length</h3>
  <ul>
    <li><code>length()</code> method: Most programming languages provide a built-in method to get the length of a string. For example, in JavaScript, you can use the <code>length</code> property of a string to get its length.</li>
    <li><code>strlen()</code> function: In languages like PHP, you can use the <code>strlen()</code> function to get the length of a string.</li>
  </ul>
  
  <h3>Example</h3>
  <p>Consider the following example in JavaScript:</p>
  <pre>
    <code>
      const str = "Hello, World!";
      const length = str.length;
      console.log(length); // Output: 13
    </code>
  </pre>
  
  <h3>Importance of String Length</h3>
  <p>Understanding the length of a string is crucial for tasks such as input validation, truncating long strings, or formatting output. It helps in ensuring that the string data is within the expected limits and can be processed efficiently.</p>
</div>

String length refers to the number of characters in a string variable in programming. It is a common operation used to determine the size of a string and can be useful for various tasks such as validation, formatting, and manipulation of text data. The length of a string can be easily obtained using built-in functions or methods provided by programming languages, allowing developers to efficiently work with strings in their code. Understanding string length is essential for handling text-based data effectively in programming.

<div>
  <h1>String Expressions</h1>
  <p>String expressions in programming refer to sequences of characters enclosed within quotation marks. These characters can include letters, numbers, symbols, and whitespace.</p>
  
  <h2>Concatenation</h2>
  <p>String concatenation is the process of combining two or more strings into a single string. This can be done using the concatenation operator (+) or specific string concatenation functions provided by the programming language.</p>
  
  <h2>String Interpolation</h2>
  <p>String interpolation allows for the embedding of variables or expressions within a string. This makes it easier to create dynamic strings that include variable values or the results of expressions.</p>
  
  <h2>String Methods</h2>
  <p>Many programming languages provide built-in methods for manipulating strings, such as converting case, finding substrings, replacing characters, and more. These methods can be used to perform various operations on strings.</p>
  
  <h2>Escape Characters</h2>
  <p>Escape characters are special characters that are used to represent non-printable characters or to include characters that have special meanings within a string. Common escape characters include newline (\n), tab (\t), and backslash (\\).</p>
  
  <h2>String Comparison</h2>
  <p>String comparison is the process of comparing two strings to determine if they are equal or if one comes before the other in lexicographical order. This is often done using comparison operators such as ==, !=, <, and >.</p>
</div>

String expressions in programming refer to any combination of characters, such as letters, numbers, and symbols, that are enclosed in quotation marks. These expressions are commonly used to represent text data in a program. String expressions can be manipulated using various string functions and operations to perform tasks like concatenation, comparison, and manipulation of text data. In programming languages, string expressions are a fundamental part of working with textual information and are essential for building applications that involve processing and displaying text.

<div>
  <h2>Basic Ternary</h2>
  <p>A basic ternary expression in programming is a concise way to write conditional statements. It consists of three parts: a condition, a value to return if the condition is true, and a value to return if the condition is false.</p>
  
  <h3>Syntax:</h3>
  <p><code>condition ? value_if_true : value_if_false</code></p>
  
  <h3>Example:</h3>
  <p><code>int x = (a > b) ? a : b;</code></p>
  
  <p>In this example, if the condition <code>a > b</code> is true, the value of <code>a</code> is assigned to <code>x</code>. Otherwise, the value of <code>b</code> is assigned to <code>x</code>.</p>
  
  <p>Basic ternary expressions are commonly used for simple conditional assignments and can make code more readable and concise.</p>
</div>

A basic ternary expression in programming consists of three parts: a condition, a value to return if the condition is true, and a value to return if the condition is false. It is a shorthand way of writing an if-else statement in a single line of code. Ternary expressions are commonly used for simple conditional assignments or to make code more concise and readable.

<div>
  <h2>Conditional (Ternary) Expressions</h2>
  <p>Conditional expressions, also known as ternary expressions, provide a concise way to evaluate a condition and return a value based on that condition. The syntax for a ternary expression is:</p>
  <pre>
    condition ? value_if_true : value_if_false;
  </pre>
  <p>The condition is evaluated first. If the condition is true, the expression returns the value after the '?' symbol. If the condition is false, the expression returns the value after the ':' symbol.</p>
  <p>Conditional expressions are commonly used in programming languages to assign values based on a condition without the need for an if-else statement. They are particularly useful when you want to assign a value to a variable based on a simple condition.</p>
  <p>Here is an example of a conditional expression in JavaScript:</p>
  <pre>
    const age = 20;
    const message = age >= 18 ? 'You are an adult' : 'You are a minor';
    console.log(message);
  </pre>
  <p>In this example, if the age is greater than or equal to 18, the message variable will be assigned the value 'You are an adult'. Otherwise, it will be assigned the value 'You are a minor'.</p>
</div>

Conditional (Ternary) Expressions are a type of expression in programming that allows for a concise way to write conditional statements. They consist of three parts: a condition, a value to return if the condition is true, and a value to return if the condition is false. Ternary expressions are often used to assign a value to a variable based on a condition without the need for an if-else statement. They can help make code more readable and efficient by reducing the number of lines needed for simple conditional logic.

<div>
  <h2>With No Arguments</h2>
  <p>When a function or method is called without any arguments, it means that the function or method does not require any input parameters to perform its task. The function or method will execute with its default behavior or with predefined values.</p>
  <p>For example, consider a function <code>printHello()</code> that simply prints "Hello" to the console. When called without any arguments like <code>printHello()</code>, it will output "Hello" without needing any additional information.</p>
  <p>Functions or methods with no arguments are useful for tasks that do not require external input or for cases where default values are sufficient.</p>
</div>

Expressions that do not require any arguments are known as expressions with no arguments. These types of expressions are self-contained and do not rely on any external input to produce a result. Examples of expressions with no arguments include simple arithmetic operations like addition or multiplication, as well as function calls that do not take any parameters. These expressions are commonly used in programming to perform specific tasks or calculations without the need for additional information.

<div>
  <h2>With Arguments</h2>
  <p>When calling a function or method, you can pass arguments to provide input values for the function to work with. Arguments are enclosed within parentheses and separated by commas.</p>
  <p>For example, in the function call <code>printMessage("Hello, World!")</code>, the argument <code>"Hello, World!"</code> is passed to the <code>printMessage</code> function.</p>
  <p>Arguments can be of any data type, including strings, numbers, arrays, objects, or even other functions.</p>
  <p>When passing arguments, you need to make sure that the number and types of arguments match the function's parameter requirements. Otherwise, you may encounter errors or unexpected behavior.</p>
</div>

Expressions in programming can also include arguments, which are values or variables that are passed to a function or method. These arguments provide additional information for the expression to work with, allowing for more dynamic and flexible code. By using arguments in expressions, programmers can create more powerful and customizable functions that can perform a wide range of tasks.

<div>
  <h2>With Return Value</h2>
  <p>When a function or method is called and it returns a value, it is known as a function/method call expression with return value. The return value is the result of the function or method's execution and can be used in further computations or assignments.</p>
  <p>For example, in the following code snippet:</p>
  <pre>
    <code>
      int sum = add(3, 5);
    </code>
  </pre>
  <p>The function <code>add</code> is called with arguments <code>3</code> and <code>5</code>, and the return value is stored in the variable <code>sum</code>.</p>
</div>

An expression with return value is one that evaluates to a specific value when executed in a programming language. This value can be a number, string, boolean, or any other data type depending on the operation performed by the expression. Return values are often used to pass information between different parts of a program or to store the result of a calculation for later use. In many programming languages, functions and methods are examples of expressions that return a value when called.

<div>
  <h2>Without Return Value</h2>
  <p>When a function or method is called without returning a value, it means that the function or method performs some actions or operations without producing a result that needs to be captured or used by the caller.</p>
  
  <h3>Example:</h3>
  <pre>
    <code>
      void printMessage(String message) {
          System.out.println(message);
      }
      
      // Calling the function without return value
      printMessage("Hello, World!");
    </code>
  </pre>
  
  <p>In the above example, the <code>printMessage</code> function prints the message to the console without returning any value.</p>
</div>

Expressions in programming can be categorized into different types based on their return value. One such type is expressions without return value, also known as void expressions. These expressions do not produce any value when evaluated and are commonly used for their side effects, such as printing output or modifying variables. In languages like C++ and Java, functions with a void return type are examples of expressions without return value.

<div>
  <h2>Function/Method Call Expressions</h2>
  <p>A function/method call expression is used to invoke a function or method in a programming language. It consists of the function/method name followed by parentheses containing any arguments that need to be passed to the function/method.</p>
  
  <h3>Components of a Function/Method Call Expression:</h3>
  <ul>
    <li><strong>Function/Method Name:</strong> The name of the function or method being called.</li>
    <li><strong>Arguments:</strong> Any values or variables that are passed to the function/method for processing.</li>
  </ul>
  
  <h3>Example:</h3>
  <p>In JavaScript, calling a function named <code>calculateSum</code> with two arguments <code>5</code> and <code>10</code> would look like this:</p>
  <pre><code>calculateSum(5, 10);</code></pre>
  
  <h3>Function/Method Call Expression in Different Languages:</h3>
  <p>Function/method call expressions may vary slightly in syntax across different programming languages, but the basic concept remains the same.</p>
  
  <h4>Python:</h4>
  <pre><code>result = add_numbers(3, 4)</code></pre>
  
  <h4>Java:</h4>
  <pre><code>int sum = calculateSum(10, 20);</code></pre>
  
  <h4>C++:</h4>
  <pre><code>int total = calculateTotal(100, 200);</code></pre>
</div>

Function/method call expressions are used in programming to execute a specific set of instructions defined within a function or method. These expressions typically include the name of the function or method followed by parentheses containing any necessary arguments. When a function/method call expression is evaluated, the corresponding function or method is executed, and the result is returned to the caller. This allows for modular and reusable code, as functions and methods can be called multiple times throughout a program.

<div>
  <h2>Single Parameter</h2>
  <p>In lambda expressions, a single parameter is a variable that represents the input to the function. It is used to define the behavior of the function without explicitly naming the parameter.</p>
  <p>When using a single parameter in a lambda expression, you can specify the parameter type explicitly or let the compiler infer the type based on the context.</p>
  <p>For example, a lambda expression with a single parameter can be written as follows:</p>
  <pre><code>(x) -&gt; x * x</code></pre>
  <p>In this example, <code>x</code> is the single parameter that represents the input to the function, and the expression <code>x * x</code> defines the behavior of the function.</p>
</div>

A single parameter in programming refers to a function or method that accepts only one input value. This input value can be of any data type, such as integer, string, or boolean. Single parameter functions are commonly used to perform specific tasks or calculations based on the provided input. By defining a single parameter, programmers can create more modular and reusable code.

<div>
  <h2>Multiple Parameters</h2>
  <p>When using lambda expressions in programming, it is common to have functions that take multiple parameters. Lambda expressions can also handle multiple parameters by specifying them within the parentheses.</p>
  
  <h3>Syntax</h3>
  <p>The syntax for a lambda expression with multiple parameters is as follows:</p>
  <pre>(parameter1, parameter2) -> expression</pre>
  
  <h3>Example</h3>
  <p>Here is an example of a lambda expression with multiple parameters:</p>
  <pre>(int a, int b) -> a + b</pre>
  
  <h3>Usage</h3>
  <p>Multiple parameters in lambda expressions can be used in various programming scenarios, such as sorting algorithms, filtering data, and mapping functions.</p>
</div>

In programming, multiple parameters refer to the ability to pass more than one value to a function or method. This allows for greater flexibility and customization in how functions are executed. By specifying multiple parameters, developers can create more dynamic and versatile code that can handle a wider range of inputs and produce more varied outputs. Additionally, multiple parameters can help improve code readability and organization by clearly defining the different inputs required for a particular function.

<div>
  <h2>No Parameters</h2>
  <p>When using lambda expressions in programming, it is possible to create expressions that do not take any parameters. This can be useful in situations where the expression does not require any input values to perform its operation.</p>
  <p>Here is an example of a lambda expression with no parameters:</p>
  <pre><code> () -> System.out.println("Hello, World!");</code></pre>
  <p>In this example, the lambda expression <code>() -> System.out.println("Hello, World!");</code> does not take any parameters and simply prints out the message "Hello, World!" when executed.</p>
  <p>When defining a lambda expression with no parameters, the empty parentheses <code>()</code> are used to indicate that no parameters are expected.</p>
</div>

When a function or method does not require any input values to be passed to it, it is said to have no parameters. This means that the function will perform its task without needing any additional information from the caller. Functions with no parameters are useful for tasks that do not rely on external data or variables to operate. They are simple and straightforward to use, making them a convenient option in programming.

<div>
  <h1>Lambda Expressions</h1>
  <p>A lambda expression is a concise way to represent an anonymous function in programming. It allows you to define a function inline without having to give it a name. Lambda expressions are commonly used in functional programming languages and are supported in many modern programming languages.</p>
  
  <h2>Syntax</h2>
  <p>The syntax of a lambda expression typically consists of the following elements:</p>
  <ul>
    <li>The lambda operator (often represented as =>)</li>
    <li>A list of parameters</li>
    <li>An arrow (=>) separating the parameters from the body of the function</li>
    <li>The body of the function, which can be a single expression or a block of statements</li>
  </ul>
  
  <h2>Usage</h2>
  <p>Lambda expressions are commonly used in scenarios where a short, one-off function is needed. They are often used in higher-order functions, such as map, filter, and reduce, to define the behavior of these functions without explicitly defining a separate named function.</p>
  
  <h2>Benefits</h2>
  <p>Some of the benefits of using lambda expressions include:</p>
  <ul>
    <li>Conciseness: Lambda expressions allow you to write functions in a more compact and readable way.</li>
    <li>Flexibility: They can be passed as arguments to other functions, making it easier to write higher-order functions.</li>
    <li>Improved code readability: Lambda expressions can make code more readable by keeping the function definition close to where it is used.</li>
  </ul>
  
  <h2>Examples</h2>
  <p>Here is an example of a lambda expression in Python that squares a number:</p>
  <pre><code>square = lambda x: x ** 2
print(square(5))  # Output: 25</code></pre>
  
  <p>And here is an example of a lambda expression in JavaScript that doubles an array of numbers:</p>
  <pre><code>const numbers = [1, 2, 3, 4, 5];
const doubled = numbers.map(x => x * 2);
console.log(doubled);  // Output: [2, 4, 6, 8, 10]</code></pre>
</div>

Lambda expressions are a concise way to represent anonymous functions in programming languages. They allow for the creation of functions without the need to explicitly define a name or return type. Lambda expressions are commonly used in functional programming languages to pass functions as arguments to higher-order functions. They provide a more compact and readable way to write code by reducing the need for boilerplate code.

<div>
  <h2>Types of Expressions in Programming</h2>
  <p>Expressions in programming are combinations of values, variables, operators, and function calls that are evaluated to produce a result. There are several types of expressions in programming:</p>
  
  <h3>1. Arithmetic Expressions</h3>
  <p>Arithmetic expressions involve mathematical operations such as addition, subtraction, multiplication, and division. For example: <code>5 + 3 * 2</code></p>
  
  <h3>2. Relational Expressions</h3>
  <p>Relational expressions compare two values and return a boolean result (true or false). Examples include: <code>5 > 3</code> or <code>'hello' == 'world'</code></p>
  
  <h3>3. Logical Expressions</h3>
  <p>Logical expressions combine multiple conditions using logical operators such as AND, OR, and NOT. For example: <code>(x > 5) && (y < 10)</code></p>
  
  <h3>4. String Expressions</h3>
  <p>String expressions involve operations on strings such as concatenation or substring extraction. Example: <code>'Hello' + 'World'</code></p>
  
  <h3>5. Assignment Expressions</h3>
  <p>Assignment expressions assign a value to a variable. Example: <code>x = 10</code></p>
  
  <h3>6. Conditional Expressions</h3>
  <p>Conditional expressions evaluate a condition and return one of two values based on the result. Example: <code>(x > 5) ? 'Yes' : 'No'</code></p>
</div>

Expressions in programming can be categorized into different types based on their functionality. Some common types of expressions include arithmetic expressions, logical expressions, relational expressions, and conditional expressions. Arithmetic expressions involve mathematical operations, logical expressions evaluate to true or false, relational expressions compare values, and conditional expressions determine the flow of a program based on certain conditions. Understanding the different types of expressions is essential for writing efficient and effective code in programming.

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Types of expressions (programming)

Types of expressions
(programming)

Chart Type

Types of expressions (programming)

Types of expressions (programming)

Types of expressions(programming)

Chart Type

Types of expressions (programming)

Types of expressions
(programming)