Why doesn't deleting my pointer delete my pointer?

Question

So to understand new/delete better (really to prove to myself with small examples why virtual destructors are needed for interfaces), I want to understand memory leaks, so that

Answer 1

// Reserve some memory for an int and set that memory to the value 43.
int* P1 = new int(43);

// Print the address of the reserved memory.
cout<<"P1 = "<