how to delete pointer c 2b 2b

1
2int* ptr;			// pointer declaration
3
4ptr = new int;	 	// dynamically allocate an integer on heap
5delete ptr;			// deletes integer from heap & frees memory
6ptr = nullptr;		// always good to reset pointer
7
8ptr = new int[5];	// dynamically allocate integer array on heap with size 5
9delete[] ptr;		// deletes integer array from heap & frees memory
10ptr = nullptr;		// always good to reset pointer