Deleting a pointer in C++

Question

Context: I\'m trying to wrap my head around pointers, we just saw them a couple of weeks ago in school and while practicing today I ran into a silly? issue, it can be super

Answer 1

int value, *ptr;

value = 8;
ptr = &value;
// ptr points to value, which lives on a stack frame.
// you are not responsible for managing its lifetime.

ptr = new int;
delete ptr;
// yes this is the normal way to manage the lifetime of
// dynamically allocated memory, you new'ed it, you delete it.

ptr = nullptr;
delete ptr;
// this is illogical, essentially you are saying delete nothing.