C language compiler

Iteration statements

while

   while (expression)
        statement

This sequence is followed repetitively:

expression is evaluated.
If expression is non-zero, statement is executed.
If expression is zero, statement is not executed, and the repetition stops.

expression must have scalar type.

   do
        statement
   while (expression);

This sequence is followed repetitively:

(do-while tests loop at the bottom; while tests loop at the top.)

   for (expression1; expression2; expression3)
        statement

expression1 initializes the loop.
expression2 is tested before each iteration.
If expression2 is true:
- statement is executed.
- expression3 is evaluated.
- Loop until expression2 is false (zero).
Any of expression1, expression2, or expression3 may be omitted, but not the semicolons.
expression1 and expression3 may have any type; expression2 must have scalar type.