do while Examples

do while loops are similar to the while loop. However, this loop will execute a least once before checking on the status of the condition. This loop will run again as long as the condition is true.

do
{
   //code block to be executed
}
while (condition);

Example

1
2
3
4
5
6
7
int i = 0;
do
{
   Console.WriteLine(i);
   i++;
}
while(i < 5);

Output

0
1
2
3
4

  • In Line 4 the do codeblock starts the loop by printing i.

  • Line 5 then updates i with i++.

  • In Line 7 the newly updated i is compared to the while statement.

As long as the while statement is true, the do block will be executed again.

In this example, i is incremented up to 4. We print 4 and then update i to 5 thanks to Line 5, but now i is no longer less than 5, it’s actually equal to 5, so the while statement is now false and the loop ends.