The value after the delete pointer is null.

First, the C ++ standard stipulates that the delete NULL pointer is legal and has no side effects.
However, after the Delete P operation, only the memory space pointed to by the pointer is released. P is not automatically set to null, And the pointer is still pointing to the previous address.

The problem arises. After a non-null pointer is deleted, if null is not assigned and the delete operation is performed again, the problem may occur.
The following code

Int * P = new int (3); Delete P;

Problems may occur when compiled and run with VC.
Change it:

Int * P = new int (3); Delete P; P = NULL; Delete P;

No problem occurs (because the delete NULL pointer is legal)
Therefore, to avoid problems, the pointer should be assigned null after being deleted.

The value after the delete pointer is null.