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infixtoPostfix
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#include <iostream>
#include <bits/stdc++.h>
using namespace std;
int prec(char c){
if(c == '^'){
return 3;
}
else if(c == '*' || c == '/'){
return 2;
}
else if(c == '+' || c == '-'){
return 1;
}
else{
return -1;
}
}
string infixtoPostfix(string s){
stack<char> st;
string res;
for(int i=0;i<s.length();i++){
if(s[i]>='a' && s[i]<='z' || s[i]>='A' && s[i] <='Z'){
res+=s[i];
}
else if(s[i]=='('){
st.push(s[i]);
}
else if(s[i]==')'){
while(!st.empty() && st.top() !='('){
res+=st.top();
st.pop();
}
if(!st.empty()){
st.pop();
}
}
else{
while(!st.empty() && prec(st.top())>prec(s[i])){
res+=st.top();
st.pop();
}
st.push(s[i]);
}
}
while(!st.empty()){
res+=st.top();
st.pop();
}
return res;
}
int main(){
cout<<infixtoPostfix("(a-b/c)*(a/k-l)")<<endl;
return 0;
}
//"(a-b/c)*(a/k-l)"