C语言的abs()函数和div()函数你了解吗

  int __cdecl abs(int _X);
  long __cdecl labs(long _X);
  div_t __cdecl div(int _Numerator,int _Denominator);
  ldiv_t __cdecl ldiv(long _Numerator,long _Denominator);

#include <stdio.h>
#include <stdlib.h>
int main(int arGC, char** argv) {
	int x1 = 56,x2 = -89;
	int y1,y2;
	y1 = abs(x1);
	y2 = abs(x2);
	printf("%d %d",y1,y2);
	return 0;
}

  typedef struct _div_t {
    int quot;
    int rem;
  } div_t;
  typedef struct _ldiv_t {
    long quot;
    long rem;
  } ldiv_t;

#include <stdio.h>
#include <stdlib.h>
int main(int argc, char** argv) {
	int x1 = 10,x2 =3;
	div_t ret;
	ret = div(x1,x2);
	printf("%d %d",ret.quot,ret.rem);
	return 0;
}