C# - The If Statement

 If Statement in C#

Use the if statement to specify a block of C# code to be executed if a condition is True.

Syntax

if (condition)

{

// block of code to be executed if the condition is True

}

Note that if is in lowercase letters. Uppercase letters (If or IF) will generate an error.

How to Use  If Statement in C#

Let's have a code below

using System;

class Program
{
    static void Main()
    {
        int number = 10;

        if (number > 0)
        {
            Console.WriteLine("The number is positive.");
        }
        else if (number < 0)
        {
            Console.WriteLine("The number is negative.");
        }
        else
        {
            Console.WriteLine("The number is zero.");
        }
    }
}

Explanation:

Condition: The condition inside the if statement is evaluated. If it returns true, the code block inside the if is executed.

Else if: This is optional and can be used to check multiple conditions. If the if condition is false, the else if condition is checked.

Else: If all previous conditions are false, the code block inside the else is executed.

Nested if-else

You can also nest if-else statements within each other to check multiple conditions:

using System;

class Program
{
    static void Main()
    {
        int number = 10;
        int anotherNumber = 5;

        if (number > 0)
        {
            if (anotherNumber > 0)
            {
                Console.WriteLine("Both numbers are positive.");
            }
            else
            {
                Console.WriteLine("The first number is positive, but the second is not.");
            }
        }
        else
        {
            Console.WriteLine("The first number is not positive.");
        }
    }
}