Different Kinds of Loops

For

The syntax of for loop is:

for (initializationStatement; testCondition; updateStatement)

{

       // Execute Compound statement

}

The initialization statement is executed only once.

Then, the test expression is evaluated. If the test expression is false (0), for loop is terminated. But if the test expression is true (nonzero), codes inside the body of for loop is executed and the update expression is updated.

This process repeats until the test expression is false.

The for loop is commonly used when the number of iterations is known.

Do...While

do

{

   // Execute Compound Statement

}

while (TestCondition);

How do...while loop works?

The code block (loop body) inside the braces is executed once.

Then, the test expression is evaluated. If the test expression is true, the loop body is executed again. This process goes on until the test expression is evaluated to 0 (false).

When the test expression is false, the do...while loop is terminated.