Defined in header <threads.h>

Defined in header <math.h>

Defined in header <signal.h>

Defined in header <stdlib.h>

A collection of operators that do not fit into any of the other major categories.

Defined in header <time.h>

Defined in header <stdatomic.h>

Defined in header <stdlib.h>

Defined in header <stdio.h>

At the top level of a translation unit (that is, a