<cstdlib>
Defines the macros traditionally defined in the Standard C library header <stdlib.h>.
#if <TRADITIONAL C HEADERS>
#include <stdlib.h>
namespace std {
using ::abort;
using ::abs;
using ::atexit;
using ::atof;
using ::atoi;
using ::atol;
using ::bsearch;
using ::calloc;
using ::div;
using ::div_t;
using ::exit;
using ::free;
using ::getenv;
using ::labs;
using ::ldiv;
using ::ldiv_t;
using ::malloc;
using ::mblen;
using ::mbstowcs;
using ::mbtowc;
using ::qsort;
using ::rand;
using ::realloc;
using ::size_t;
using ::srand;
using ::strtod;
using ::strtol;
using ::strtoul;
using ::system;
using ::wcstombs;
using ::wctomb;
}
#endif
Remarks
Including this header also ensures that the names declared with external linkage in the Standard C library header are declared in the std namespace. In this implementation, the names may or may not also be declared in the global namespace, depending on the specific translation environment.