Переименование и удаление файла

#include <stdio.h>
#include <io.h>
#include <stdlib.h>
#include <iostream>
 
using namespace std;
 
void main ()
{ 
  int num_act;
 
  cout << "1 - CONCLUSION OF THE CONTAINED CURRENT CATALOGUE\n";
  cout << "2 - DELIVERY OF THE INFORMATION ON CHARACTERISTICS OF THE SPECIFIED FILE\n";
  cout << "3 - FILE REMOVAL\n";
  cout << "4 - FILE RENAMING\n";
  cout << "5 - LIBRARY UNLOADING\n";
 
  cout << "Choose action: ";
  cin >> num_act;
 
 
  while (num_act != 5)
  {
    switch(num_act)
    {
    case 4:
      cout << "FILE RENAMING\n";
 
      char oldn[_MAX_PATH], newn[_MAX_PATH];
      int result4; 
 
      printf ("Enter the old filename: ");
      cin >> oldn; 
 
      printf ("Enter the new filename: ");
      cin >> newn; 
 
      result4 = rename (oldn, newn); 
 
      if (result4 == 0)
        printf ("File successfully renamed.\n"); 
      else
        perror("Unable to rename file"); 
      
      break;
      // FILE RENAMING   //END
      
    // FILE REMOVAL      //BEGIN
    case 3:
      int value; 
      char rem_name[_MAX_PATH]; 
 
      printf ("Enter file to remove: "); 
 
      cin >> rem_name;
 
      value = _unlink (rem_name); 
      
      if (value == 0) 
        printf ("Erased \"%s\" from disk\n", rem_name); 
      else 
      { 
        perror("Unable to erase file"); 
        //       exit (EXIT_FAILURE); 
      }
    
      break;
      //FILE REMOVAL     //END
 
    default:
      break;
    }
 
    cout << "Choose action: ";
    cin >> num_act;
  }
}