#Tutorial8#
While loops
While loops are similar to for loops, but have less functionality. A while loop continues executing the while block as long as the condition in the while remains true. For example, the following code will execute exactly ten times:
int n = 0;
while (n < 10) {
n++;
}
Execute Code
While loops can also execute infinitely if a condition is given which always evaluates as true (non-zero):while (1) {
/* do something */
}
Loop directives
There are two important loop directives that are used in conjunction with all loop types in C - thebreak
and continue
directives.The
break
directive halts a loop after ten loops, even though the while loop never finishes:int n = 0;
while (1) {
n++;
if (n == 10) {
break;
}
}
Execute Code
In the following code, the continue
directive causes the printf
command to be skipped, so that only even numbers are printed out:int n = 0;
while (n < 10) {
n++;
/* check that n is odd */
if (n % 2 == 1) {
/* go back to the start of the while block */
continue;
}
/* we reach this code only if n is even */
printf("The number %d is even.\n", n);
}
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