Usage _Complex type: as the declaration of the type

When an expression is used in the context where a value of a different type is expected, conversion may occur:

Defined in header <threads.h>

Functions Time manipulation

Defined in header <stdatomic.h>

Defined in header <math.h>

Defined in header <wchar.h>

Defined in header <stdlib.h>

Defined in header <stdio.h>

Usage conditionally-supported type specifier for Fortran language linkage. May be used with