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postfix_evaluation
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#include <iostream>
#include <bits/stdc++.h>
using namespace std;
int postfixEvaluation(string s){
stack<int> st;
for(int i=0;i<s.length();i++){
if(s[i]>='0' && s[i]<='9'){
st.push(s[i]-'0');
}
else{
int op2 = st.top();
st.pop();
int op1 = st.top();
st.pop();
switch (s[i])
{
case '+':
st.push(op1+op2);
break;
case '-':
st.push(op1-op2);
break;
case '*':
st.push(op1*op2);
break;
case '/':
st.push(op1/op2);
break;
case '^':
st.push(pow(op1,op2));
break;
default:
break;
}
}
}
return st.top();
}
int main(){
cout<<postfixEvaluation("46+2/5*7+");
return 0;
}
//"46+2/5*7+"
//Answer is 32