why and when is a double-pointer required?

Question

I have been a sysadmin most of my life, but recently decided to practice some my dev knowledge and attempt a devops position. I have as such been practicing some C and Pytho

Answer 1

h is actually a copy of the original pointer, so your original pointer doesnot get modified. That is why you should use a double pointer.

There are numerous questions related to that on SO. for example Using single versus double pointers in Linked lists implemented in C