Loops and Iteration in C# - Example You Can Run Online

Introduction

C# offers several loop forms so iteration can express either indexes, values, or a changing condition.

foreach avoids manual indexes when only values are needed. continue skips the current item without ending the loop.

See how it works

Press Step to run the loop one move at a time. Watch the condition being checked, the body running and the trace table growing row by row.

Runnable C# example

C#

Run code →

Program.cs

using System;

class Program
{
    static void Main()
    {
        int[] numbers = { 1, 2, 3, 4, 5, 6 };
        foreach (int number in numbers)
        {
            if (number % 2 != 0) continue;
            Console.WriteLine(number * number);
        }
    }
}

Result of running the code

4
16
36

Practice with the debugger

Set a breakpoint on an important assignment or condition, click Debug, and inspect the local values before stepping to the next line.

Practice with a challenge

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