C# While Loop Examples

While Loop Examples

The while loop is a fundamental control flow statement in C# that allows code to be executed repeatedly while a certain condition is true. Here are some examples of using while loops:

Basic Example

• Initialize a variable i with a value of 0.
• The loop continues to execute as long as i is less than 5.
• In each iteration, i is incremented by 1.

int i = 0;
while (i < 5)
{
    Console.WriteLine(i);
    i++;
}

Reading User Input

• Prompt the user to enter their name.
• Continue to prompt the user until they enter a non-empty string.

string name;
while (true)
{
    Console.Write("Enter your name: ");
    name = Console.ReadLine();
    if (!string.IsNullOrWhiteSpace(name))
    {
        break;
    }
    Console.WriteLine("Please enter a valid name.");
}

Simulating a Timer

• Initialize a variable seconds with a value of 10.
• The loop continues to execute as long as seconds is greater than 0.
• In each iteration, seconds is decremented by 1.

int seconds = 10;
while (seconds > 0)
{
    Console.WriteLine($"Time remaining: {seconds} seconds");
    seconds--;
    System.Threading.Thread.Sleep(1000); // wait for 1 second
}
Console.WriteLine("Time's up!");

While Loop Examples

Basic Example

• Initialize a variable i with a value of 0, and the loop continues to execute as long as i is less than 5.
• In each iteration, i is incremented by 1, and the current value of i is printed to the console.

Reading User Input

• Continuously prompt the user to enter their name until a non-empty string is entered.
• If an empty string is entered, the user is prompted again, and an error message is displayed.

Simulating a Timer

• Initialize a variable seconds with a value of 10, and the loop continues to execute as long as seconds is greater than 0.
• In each iteration, seconds is decremented by 1, and the remaining time is printed to the console.
• The program waits for 1 second between each iteration using System.Threading.Thread.Sleep(1000).
• When seconds reaches 0, a "Time's up!" message is displayed.