C & C++ Programming - Exception Handling

#include "stdafx.h"

#include < stdio.h >
#include < stdlib.h >

enum ERROR
{
 FILENOTFOUND = 1,
 MEMORYNOTALOCATED,
 UNDEFINED
};

//////////////////////////////////////////////////////////////////////////////////////////////////
// I Method - Catch should be define in constructor itself
class A
{
public:

 A(char *FileName, int cnt)
 {
  try
  {
   fp = fopen( FileName, "r" );
   if(!fp) throw FILENOTFOUND;

   str = (char *) malloc(cnt*sizeof(cnt));
   if(!str) throw MEMORYNOTALOCATED;
  }
  catch(ERROR e)
  {
   switch(e)
   {
    case FILENOTFOUND:
     printf("File not found\n");
     break;
    case MEMORYNOTALOCATED:
     printf("File not found\n");
     break;
    default:
      printf("Undefined Error\n");
      break;
   }
  }
 }

 ~A()
 {
  cout << "DTOR\n";
 }

private:
 FILE *fp;
 char *str;
};

main()
{
 A obj("Vector.hxx", 20);
}


//////////////////////////////////////////////////////////////////////////////////////////////////
// II Methodlogy - evil destructor will not call.
class A
{
public:
 A(char *FileName, int cnt)
 {

  fp = fopen( FileName, "r" );
  if(!fp) throw FILENOTFOUND;

  str = (char *) malloc(cnt*sizeof(cnt));
  if(!str) throw MEMORYNOTALOCATED;
 }

  ~A()
 {
  cout << "DTOR\n";
 }

private:
 FILE *fp;
 char *str;
};

//////////////////////////////////////////////////////////////////////////////////////////////////
void TestException()
{
 try
 {
  A obj("Vector.hxx", 20);
 }
 catch(ERROR e)
 {
  switch(e)
  {
  case FILENOTFOUND:
   printf("File not found");
   break;
  case MEMORYNOTALOCATED:
   printf("File not found");
   break;
  default:
   printf("Undefined Error");
   break;
  }
 }
}