Differences when using ** in C

Question

I started learning C recently, and I\'m having a problem understanding pointer syntax, for example when I write the following line:

int ** arr = NULL;
         


        

Answer 1

How can I know if :

arr is a pointer to a pointer of an integer

arr is a pointer to an array of pointers to integers

arr is a pointer to an array of pointers to arrays of integers

You cannot. It can be any of those. What it ends up being depends on how you allocate / use it.

So if you write code using these, document what you're doing with them, pass size parameters to the functions using them, and generally be sure about what you allocated before using it.