C Pocket Reference

Name

do ... while

Synopsis

The do ... while statement is a “bottom-driven” loop: first the body of the loop is executed, then the controlling expression is evaluated. This is repeated until the controlling expression is “false”, or 0.

The key difference from a while statement is that a do ... while loop body is always executed at least once. A while loop may not execute at all, because its expression could be false to begin with.

Syntax:

do statement  while ( expression ) ;

Example:

i = 0;
do                      // Copy the string str1
    str2[i] = str1[i];  // to string str2 
while ( str1[i++] != '\0' );