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

int main()
{
    int N;

    while(scanf("%d",&N)!=EOF)
    {
        int i,a;
        long long int b,c;
        for(i=0;i<N;i++)
        {
            scanf("%d %d %d",&a,&b,&c);
            switch(a)
            {
                case 1:
                    printf("%d\n",b+c);
                    break;
                case 2:
                    printf("%d\n",b-c);
                    break;
                case 3:
                    printf("%d\n",b*c);
                    break;
                case 4:
                    printf("%d\n",b/c);
                    break;
            }
        }
    }
    return 0;
}

=========================================

一開始用int時沒有錯 但是會overflow

改用long long int 後，b/c卻會錯誤

會甚麼會這樣哩??