f: abort abs atexit atof atoi atol bsearch calloc div ecvt exit free getenv labs ldiv malloc mblen mbtowc mbstowcs qsort rand realloc srand strtod strtol strtoul system wctomb wcstombs v: EXIT_FAILURE EXIT_SUCCESS MB_CUR_MAX NULL RAND_MAX t: div_t ldiv_t wchar_t