C++ Program to convert a Decimal int to Hexadecimal

How to write a C++ Program to convert a Decimal int to Hexadecimal 

#include <iostream>
#include <fstream>
#include <string>
#include <sstream>
using namespace std;

template <class T>
string to_string(T t, ios_base & (*f)(ios_base&))
{
  ostringstream oss;
  oss << f << t;
  return oss.str();
}

int main () 
{
  int integer;
  cout << "Enter A Number To Conver Into Hex=" ;
   cin>>integer;
   cout << endl;
  cout<<"Hex Output="<<to_string<long>(integer, hex)<<endl;  
  
  return 0;
}

OUTPUT:

Enter A Number To Conver Into Hex=127

Hex Output=7f

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