2.13.1 Variables and Definitions
size_t is the unsigned integer result of the
wchar_t is an integer type of the size of a wide character constant.
div_t is the structure returned by the
ldiv_t is the structure returned by the
NULL is the value of a null pointer constant.
EXIT_SUCCESS are values for the exit function to return termination status.
RAND_MAX is the maximum value returned by the rand function.
MB_CUR_MAX is the maximum number of bytes in a multibyte character set which cannot be larger than