Reference C Library IOstream Library Strings library STL Containers STL Algorithms Miscellaneous C Library cassert (assert.h) cctype (ctype.h) cerrno (errno.h) cfloat (float.h) ciso646 (iso646.h) climits (limits.h) clocale (locale.h) cmath (math.h) csetjmp (setjmp.h) csignal (signal.h) cstdarg (stdarg.h) cstddef (stddef.h) cstdio (stdio.h) cstdlib (stdlib.h) cstring (string.h) ctime (time.h) ctime (time.h) functions: asctime clock ctime difftime gmtime localtime mktime strftime time macros: CLOCKS_PER_SEC NULL types: clock_t size_t time_t struct tm

NULL macro <ctime> Null pointer This macro expands to a null pointer constant. A null pointer is generally used to signify that a pointer does not point to any object. In C++, NULL expands either to 0 or 0L.

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