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for (C# Reference)

The for loop executes a statement or a block of statements repeatedly until a specified expression evaluates to false. The for loop is handy for iterating over arrays and for sequential processing. In the following example, the value of int i is written to the console and i is incremented each time through the loop by 1.

// statements_for.cs
// for loop
using System;
class ForLoopTest 
{
    static void Main() 
    {
        for (int i = 1; i <= 5; i++)
        {
            Console.WriteLine(i);
        }
    }
}

 
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The for statement executes the enclosed statement or statements repeatedly as follows:

  • First, the initial value of the variable i is evaluated.

  • Then, while the value of i is less than or equal to 5, the condition evaluates to true, the Console.WriteLine statement is executed and i is reevaluated.

  • When i is greater than 5, the condition becomes false and control is transferred outside the loop.

Because the test of conditional expression takes place before the execution of the loop, therefore, a for statement executes zero or more times.

All of the expressions of the for statement are optional; for example, the following statement is used to write an infinite loop:


        for (;;)
{
    // ...
}

For more information, see the following sections in the C# Language Specification:

  • 5.3.3.9 For statements

  • 8.8.3 The for statement

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