What is a dangling pointer?

Question

I know this is pretty common question, but still new for me!

I don\'t understand concept of dangling pointer, was googling around, and writing test methods to find o

Answer 1

//Declaring two pointer variables to int
int * ptr1;
int * ptr2;
// Allocating dynamic memory in the heap
ptr1 = new int;
ptr2 = ptr1; // Having both pointers to point same dynamic memory location
//deleting the dynamic memory location 
delete ptr1;
ptr1 = nullptr; 
//ptr2 is still pointing the already deleted memory location 
//We call ptr2 is a dangling pointer