Need to code this in c++. Reverse polish notation using stacks. out put (1+2)*3

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 Need to code this in c++. Reverse polish notation using stacks. out put (1+2)*3 = 1 2+3* or 2* (1+2) 2 1 3 + * and do the arithmatic   #include <iostream> #include <string.h>  #include <stack> #include <sstream> #include <stdlib.h>  using namespace std ;  int main() {stack<float>stack; int i; float num,result,first,second;   char op,ch; string str,str1;  getline(cin,str); istringstream is(str);   for(;is>>str1;){  if(str1.compare("+")==0){      first=stack.top();     stack.pop();     second=stack.top();     stack.pop();       stack.push(first+second);      }else if(str1.compare("-")==0){      first=stack.top();     stack.pop();     second=stack.top();     stack.pop();     stack.push(first-second);     }else if(str1.compare("*")==0){      first=stack.top();     stack.pop();     second=stack.top();     stack.pop();     stack.push(first*second);     }else if(str1.compare("/")==0){      first=stack.top();     stack.pop();     second=stack.top();     stack.pop();     stack.push(first/second);     }else{      stack.push(strtof(str1.c_str(),NULL));                   } } cout<<"The result of the expression is:"<<stack.top(); }  

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