C Primer Plus®, Third Edition

General Utilities: stdlib.h

The ANSI C standard library includes a variety of utility functions defined in stdlib.h. The header file defines the types shown in Table F.13.

Table F.13. Types defined in stdlib.h.

Type	Description
size_t	The integer type returned by the sizeof operator.
wchar_t	The integer type used to represent wide characters.
div_t	The structure type returned by div(); it has a quot and a rem member, both of type int.
ldiv_t	The structure type returned by ldiv(); it has a quot and a rem member, both of type long.

The header file defines the constants listed in Table F.14.

Table F.14. Constants defined in stdlib.h.

Type	Description
NULL	The null pointer (equivalent to 0).
EXIT_FAILURE	Can be used as an argument to exit() to indicate unsuccessful ...