# 代码：
```cpp
#include<bits/stdc++.h>
using namespace std;
long long stk[1000];
int main(){
long long i=0,now=0;
char op;
while((op=getchar())!='@'){
if(op>='0'&&op<='9') now*=10,now+=op-'0';
else if(op=='.'){
stk[++i]=now;
now=0;
}
else if(op=='+'){
stk[i-1]=stk[i-1]+stk[i];
stk[i]=0;
i--;
}
else if(op=='-'){
stk[i-1]=stk[i-1]-stk[i];
stk[i]=0;
i--;
}
else if(op=='*'){
stk[i-1]=stk[i-1]*stk[i];
stk[i]=0;
i--;
}
else if(op=='/'){
stk[i-1]=stk[i-1]/stk[i];
stk[i]=0;
i--;
}
}
cout<<stk[1];
return 0;
}
```
by lihaoyu68 @ 2024-03-28 18:16:57