C Primer Plus®, Third Edition

Summary: The while Statement

Keyword

The keyword for the while statement is while.

General Comments

The while statement creates a loop that repeats until the test expression becomes false, or zero. The while statement is an entry-condition loop; the decision to go through one more pass of the loop is made before the loop has been traversed. Therefore, it is possible that the loop is never traversed. The statement part of the form can be a simple statement or a compound statement.

Form

while (expression)
        statement
					

The statement portion is repeated until the expression becomes false or zero.

Examples

while (n++ < 100)
      printf(" %d %d\n",n, 2*n+1);
while (fargo < 1000)
{
      fargo = fargo + step;
      step = 2 * step;
}