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30 lines
741 B
30 lines
741 B
#include <bits/stdc++.h>
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using namespace std;
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bool isOp(string c){
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return c == "+" || c == "-" || c == "*" || c == "/";
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}
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int eval(string s){
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stack<int> stk;
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stringstream s1(s);
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string c;
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while (s1>>c){
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if(isOp(c)){
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int a = stk.top();
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stk.pop();
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int b = stk.top();
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stk.pop();
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if (c == "+") stk.push(b + a);
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if (c == "-") stk.push(b - a);
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if (c == "*") stk.push(b * a);
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if (c == "/") stk.push(b / a);
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}else
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stk.push(stoi(c));
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}
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return stk.top();
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}
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int main() {
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string s = "24 9 6 3 / + 5 - * 4 +";
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cout << "answer:" << eval(s) << endl;
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return 0;
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} |