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@@ -0,0 +1,31 @@
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+#include <bits/stdc++.h>
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+using namespace std;
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+int main() {
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+ stack<double> S;
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+ string x;
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+ while (cin >> x) {
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+ istringstream iss(x);
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+ double r;
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+ if (iss >> r) {
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+ S.push(r);
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+ } else {
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+ double second = S.top();
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+ S.pop();
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+ double first = S.top();
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+ S.pop();
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+ double res = first;
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+ if (x[0] == '+') {
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+ res += second;
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+ } else if (x[0] == '-') {
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+ res -= second;
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+ } else if (x[0] == '*') {
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+ res *= second;
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+ } else {
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+ res /= second;
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+ }
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+ S.push(res);
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+ }
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+ }
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+ cout << fixed << setprecision(2) << S.top() << endl;
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+ return 0;
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+}
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