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calculator.cpp
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calculator.cpp
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#include <iostream>
#include <stack>
#include <string>
#include <sstream>
using namespace std;
int main(){
stack<double> da_stack;
while(true){
string in;
cin >> in;
if(in == "+"){
double a = da_stack.top();
da_stack.pop();
double b = da_stack.top();
da_stack.pop();
da_stack.push(a + b);
}
else if(in == "-"){
double a = da_stack.top();
da_stack.pop();
double b = da_stack.top();
da_stack.pop();
da_stack.push(a - b);
}
else if(in == "*"){
double a = da_stack.top();
da_stack.pop();
double b = da_stack.top();
da_stack.pop();
da_stack.push(a * b);
}
else if(in == "/"){
double a = da_stack.top();
da_stack.pop();
double b = da_stack.top();
da_stack.pop();
da_stack.push(a / b);
}
else if(in == "="){
if(da_stack.size() != 1){
cout << "Bad expression" << endl;
}
else{
cout << da_stack.top() << endl;
da_stack.pop();
}
}
else{
double d;
stringstream ss(in);
ss >> d;
da_stack.push(d);
}
}
}