#include "stdio.h"
int mymod(int,int)
main()
{  int s,a,b;
   printf("input a and b :\n");
   scanf("%d%d",&a,&b);
   s=mymod(int,int);
   
}
  int mymod(inta,intb)
  {int c;
     c=a%b;
     return c;
      }

#include "stdio.h"
int mymod(int,int);
main()
{
    int s,a,b;
    printf("input a and b :\n");
    scanf("%d%d",&a,&b);
    s=mymod(a,b);
    printf("s = %d\n", s);
   
}
int mymod(int a,int b)
{
    int c;
    c=a%b;
    return c;
}

.....

谢谢，你真是我的良师益友。

调用