reanme a file from use iinput

gistfile1.hpp

//re-name-file-usr-input.cpp

#include<iostream>
#include<fstream>
#include<cstring>

using namespace std;

int main()
{
  ofstream button_E;
  ofstream button_I;
  button_E.open("e");
  button_I.open("i");
  string subject;
  int result;  

  cout << "subject number: ";  
  cin >> subject;
  cin.ignore(80,'\n');
  cout << "Word Up. It looks like you entered: ";
  
  //FIRST copy for button e      
  char *e_new=new char[subject.size()+1];
  // assign the value of zero to the array
  e_new[subject.size()]=0;
  // copy data from temp string into char array
  memcpy(e_new,subject.c_str(),subject.size());


  for (int i=0; i < 3; i++)
    cout << e_new[i];
    
  cout << endl;        
        
  e_new[3]='_';
  e_new[4]='e';
  e_new[5]='.';
  e_new[6]='t';
  e_new[7]='x';
  e_new[8]='t';
    
  char e_old[2];
  
  e_old[0]='e';


  button_E.close();

  result=rename(e_old , e_new);
  if (result ==0)
    cout << "cool could renam e\n";
  else
    cout << "fuck, could not rename e\n";

  //NEXT COPY FOR i
  char *i_new=new char[subject.size()+1];
  // assign the value of zero to the array
  i_new[subject.size()]=0;
  // copy data from temp string into char array
  memcpy(i_new,subject.c_str(),subject.size());


  for (int i=0; i < 3; i++)
    cout << i_new[i];
    
  cout << endl;        
        
  i_new[3]='_';
  i_new[4]='i';
  i_new[5]='.';
  i_new[6]='t';
  i_new[7]='x';
  i_new[8]='t';
    
  char i_old[2];
  
  i_old[0]='i';


  button_I.close();

  result=rename(i_old , i_new);

  
  
  if (result ==0)
    cout << "cool, renamed i\n";
  else
    cout << "fuck, could not rename i\n";    
      
  return 0;    
}//closes program