2个WA#2#6错了

https://www.luogu.com.cn/record/130993845

#include <bits/stdc++.h>
using namespace std;
stack<int>n;
char c;
int s=0,x,y;
int main(){
    while(c!='@'){
        c=getchar();
        if(c=='@')break;
        else if('0'<=c&&c<='9')
          s=s*10+c-'0';
        else if(c=='.'){
          n.push(s);s=0;
        }
        else{
            x=n.top(); n.pop(); 
            y=n.top(); n.pop();
            if(c=='+')n.push(x+y);
            if(c=='-')n.push(y-x);
            if(c=='*')n.push(x*y);
            if(c=='/')n.push(x/y);
        }
    }
    cout<<n.top();
    return 0;
}