C# While Loop Examples
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Questions and Answers

What is the condition for the while loop to continue executing in the basic example?

  • i is not equal to 5
  • i is greater than 5
  • i is less than 5 (correct)
  • i is equal to 5
  • What is the purpose of the while loop in the reading user input example?

  • To display a message to the user
  • To prompt the user to enter their name once
  • To prompt the user to enter their name until they enter a valid name (correct)
  • To exit the program
  • What happens to the variable seconds in each iteration of the while loop in the simulating a timer example?

  • It is assigned a value of 10
  • It is incremented by 1
  • It is decremented by 1 (correct)
  • It is reset to 0
  • What is the purpose of the System.Threading.Thread.Sleep(1000) line in the simulating a timer example?

    <p>To wait for 1 second</p> Signup and view all the answers

    What is the output of the basic example when i is equal to 4?

    <p>The value 4 will be displayed</p> Signup and view all the answers

    Study Notes

    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 &lt; 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 &gt; 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.

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    Description

    Examples of using while loops in C# programming language, including basic examples and reading user input.

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