强制转换怎么答案不对！我刚刚学函数！！！

昏暗___杜鹃鸟

#include <stdio.h>
int pin(int x, int y)
{
if(x>y)printf("%d>%d\n",x,y);
else printf("%d<%d\n",x,y);
}
int pba(int i,char c,int j)
{
switch(c)
{
case '+':
  printf("%d%c%d=%lf\n",i,c,j,(double)(i+j));
  break;
case '-':
  printf("%d%c%d=%lf\n",i,c,j,(double)(i-j));
  break;
case '*':
  printf("%d%c%d=%lf\n",i,c,j,(double)(i*j));
  break;
case '/':
  printf("%d%c%d=%lf\n",i,c,j,(double)(i/j));
  break;
}
}
void main()
{
int a, b;
char l;
for(;;)
{
printf("put:\n");
scanf("%d%c%d",&a,&l,&b);
pba(a,l,b);
pin(a,b);
printf("__________B________O_________O________S_______________\n");
}
}