大一程序设计基础，救命啊

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#include <stdio.h>
void main()
{
  int x, y;
  printf("please enter a,b,c:");
  scanf("%d,%d",&x,&y);
  printf("\nx+y=%d\n",x+y);
  printf("x-y=%d\n",x-y);
  printf("x*y=%d\n",x*y);
  printf("x/y=%d\n",x/y);
  printf("x%%y=%d\n",x%y);
}

#include <stdio.h>
#include <math.h>

void main(){
int x,y;
printf("please enter two number\n");

  scanf("%d%d",&x,&y);
  printf("[x] + [y] = [%d]\n",x+y);
  printf("[x] - [y] = [%d]\n",x-y);
  printf("[x] * [y] = [%d]\n",x*y);
  if(x%y==0){
        printf("[x] / [y] = [%d]\n",x/y);
  }
  else{
        printf("[x] / [y] = [%.2f]\n", (double)(x)/(double)(y));
  }

}