Defined in header <stdio.h>

Defined in header <wctype.h>

Defined in header <complex.h>

Defined in header <string.h>

Defined in header <math.h>

Defined in header <threads.h>

Executes a statement repeatedly until the value of condition becomes false. The test takes place after each iteration

Defined in header <stddef.h>

Defined in header <complex.h>

Defined in header <math.h>