Defined in header <math.h>

Error numbers Defined in header <errno.h>

Defined in header <complex.h>

Defined in header <stdlib.h>

Defined in header <fenv.h>

Defined in header <stdlib.h>

Usage signed

Defined in header <wchar.h>

Defined in header <wchar.h>

Variadic functions are functions that may be called with different number of arguments. Only new-style (prototyped)