size_t is the unsigned integer result of the
sizeof keyword.wchar_t is an integer type of the size of a
wide character constant.
div_t is the structure returned by the
div function.
ldiv_t is the structure returned by the
ldiv function.
NULL is the value of a null pointer constant.
EXIT_FAILURE and 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
MB_LEN_MAX .
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