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: