<stdlib.h>

The <stdlib.h> include file declares the following functions:

Note: ¹ These functions are applicable to C++ only.

The <stdlib.h> include file also contains definitions for the following macros:

NULL: The NULL pointer value.
EXIT_SUCCESS: Expands to 0; used by the atexit function.
EXIT_FAILURE: Expands to 8; used by the atexit function.
RAND_MAX: Expands to an integer that represents the largest number that the rand function can return.
MB_CUR_MAX: Expands to an integral expression to represent the maximum number of bytes in a multibyte character for the current locale.

For more information about NULL and the types size_t and wchar_t, see <stddef.h>.