Defined in header <wchar.h>

Defined in header <stdio.h>

A function declaration introduces an identifier that designates a function

Defined in header <time.h>

Usage for loop: as the

Defined in header <math.h>

Constructs an unnamed object of specified type in-place, used when a variable of array, struct, or union type would be needed only once.

Usage typedef

Defined in header <stdio.h>

Defined in header <complex.h>