RT, 3蛙3重可还行，失败记录

$Code$ ：

#include <bits/stdc++.h>
using namespace std;
long simstk[1024];
int main(void) {
    int i=0,num=0,ch;
    while((ch = getchar())!=64) {
        if(ch >= 48 && ch <= 57) num*=10,num+=ch^48;
        else if(ch == 49) simstk[++i]=num,num=0;
        else {
            if(ch == 43) simstk[i-1]+=simstk[i];
            else if(ch == 45) simstk[i-1]-=simstk[i];
            else if(ch == 42) simstk[i-1]*=simstk[i];
            else if(ch == 47) simstk[i-1]/=simstk[i];
            simstk[i]=0,i--;
        }
    }
    printf("%ld",simstk[1]);
    return 0;
}