The for loop executes a statement or a block of statements repeatedly until a specified expression evaluates to false. The for loop is useful 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 every time through the loop by 1.
class ForLoopTest
{
static void Main()
{
for (int i = 1; i <= 5; i++)
{
Console.WriteLine(i);
}
}
}
/*
Output:
1
2
3
4
5
*/
The for statement executes the enclosed statement or statements repeatedly as follows:
First, the initial value of the variable i is evaluated.
Then, as long as 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 a conditional expression occurs before the execution of the loop, 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:
C# Language Specification
For more information, see the following sections in the C# Language Specification:
5.3.3.9 For statements
8.8.3 The for statement
Concepts
Reference
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