C# Tutorial 4.3: Control Flow Statements - Loops (for, while, do-while)

 In C#, loops are used to repeatedly execute a block of code. There are three primary types of loops in C#: for, while, and do-while. Let's explore each one with examples.

1. The for Loop:

The for loop is often used when the number of iterations is known beforehand.

using System;

class Program

{

    static void Main()

    {

        // Example of a while loop

        int count = 1;

        while (count <= 5)

        {

            Console.WriteLine($"Iteration {count}");

            count++;

        }

    }

}

• The loop initializes i to 1.
• It continues as long as i is less than or equal to 5.
• After each iteration, i is incremented by 1.

2. The while Loop:

The while loop is used when the number of iterations is not known beforehand, and the loop continues as long as a specified condition is true.

using System;

class Program

{

    static void Main()

    {

        // Example of a do-while loop

        int number = 1;

        do

        {

            Console.WriteLine($"Iteration {number}");

            number++;

        } while (number <= 5);

    }

}

• The count variable is incremented within the loop.

3. The do-while Loop:

The do-while loop is similar to the while loop, but it always executes the block of code at least once, even if the condition is initially false.

using System;
class Program
{
    static void Main()
    {
        // Example of a do-while loop
        int number = 1;
        do {
            Console.WriteLine($"Iteration {number}");
            number++; 
        } 
        while (number <= 5);
    }
}

• The block of code is executed at least once.
• The loop continues as long as number is less than or equal to 5.

4. Experiment:

• Try changing the loop conditions and see how it affects the output.
• Combine loops with other control flow statements.

5. Run the Program:

Press F5 or click the "Start Debugging" button to build and run your program. You should see the output with iterations from each loop.