Memory allocation is done in 3 places

1. Static memory area

2. Stack - memory released when the var goes out of scope , no overhead

3. Heap - requires memory management , and overhead

    eg. MyClass * mObj = new MyClass;

         delete mObj;

     Note : does automatic check for memory space existence before passing pointer to constructor.

New    -  creates memory space for object ANDD calls constructor         malloc - creates only the mem space AND returns VOID*

Delete  - frees the mem space AND calls the destrucctor                         free     - only frees the mem space

int  _tmain(int  argc,  _TCHAR*  argv[])
{
  Test*  t1  =  new  Test();
  t1->Hello();
  delete  t1;

  Test*  t2  =  (Test*)  malloc(sizeof  Test);
  t2->Hello();
  free(t2);

  return  0;
}

Tip : After using delete its a good practise to set the poiinter obj to 0 since deleting a pointer second time

             by mistake will not cause damage if the pointer points to 0..

Tip ( What happens when new does not allocate memory )

Beginning in Visual C++ .NET 2002, the CRT's new function (in libc.lib, libcd.lib, libcmt.lib, libcmtd.lib, msvcrt.lib, and msvcrtd.lib) will continue to return NULL if memory allocation fails. However, the new function in the Standard C++ Library (in libcp.lib, libcpd.lib, libcpmt.lib, libcpmtd.lib, msvcprt.lib, and msvcprtd.lib) will support the behavior specified in the C++ standard, which is to throw a std::bad_alloc exception if the memory allocation fails.

Memory Leaks