各位大大, 

小弟也是初學，請大大幫忙看看程式哪裡有問題。

#include <stdio.h>
#include <stdlib.h>

int main()
{
int i;
int a, b, c;
int sum = 0;
double sum1=0;

while (scanf("%d%d%d", &a, &b, &c)==3)
{
switch (a)
{
case 1:
sum = b+c;
printf("%d\n", sum);
break;

case 2:
sum = b-c;
printf("%d\n", sum);
break;

case 3:
sum = b*c;
printf("%d\n", sum);
break;

case 4:
sum1 = b/c;
printf("%.f\n", sum1);
break;
}
}
system ("pause");
return 0;
};

感恩