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OI-codes/Luogu/P1449/P1449.cpp

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#include <bits/stdc++.h>
using namespace std;
int main() {
stack<int> st;
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char ch;
int a, b, t = 0;
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while (cin >> ch, ch != '@') {
if (ch == '.') {
st.push(t);
t = 0;
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} else if ('0' <= ch && ch <= '9') {
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t *= 10;
t += ch - '0';
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} else {
b = st.top();
st.pop();
a = st.top();
st.pop();
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if (ch == '+') {
st.push(a + b);
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} else if (ch == '-') {
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st.push(a - b);
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} else if (ch == '*') {
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st.push(a * b);
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} else if (ch == '/') {
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st.push(a / b);
}
}
}
cout << st.top() << endl;
return 0;
}