@[C112345565_](/user/1073331)
The ans:
```cpp
#include <bits/stdc++.h>
using namespace std;
stack<long long> sta;
char a[1001];
int main() {
cin.getline(a, 1001);
long long temp = 0, x = 0, y = 0;
for (int i = 0; a[i] != '@'; i++)
{
x = 0, y = 0;
if (a[i] >= '0' && a[i] <= '9')
temp = temp * 10 + (a[i] - '0');
else if (a[i] == ' ' || a[i] == '.')
sta.push(temp), temp = 0;
else
{
y = sta.top();
sta.pop();
x = sta.top();
sta.pop();
switch (a[i])
{
case '+': {sta.push(x + y); break;}
case '-': {sta.push(x - y); break;}
case '*': {sta.push(x * y); break;}
case '/': {sta.push(x / y); break;}
}
}
}
cout << sta.top();
return 0;
}
```
by Enoch2013 @ 2024-04-13 15:37:22
@[C112345565_](/user/1073331) 你要用栈，读入有用$cin.getline()$
by Enoch2013 @ 2024-04-13 15:38:41
@[Enoch2013](/user/1069719) 感谢感谢，已关
by C112345565_ @ 2024-04-13 15:40:23