Changing pointer address via function

Question

I tried to pass a double pointer into a void function as an argument. The double pointer points to the first element of a matrix. How do I write a prototype of that function so that I can change the address of my pointer? I tried writing int &**p but I can't get it to work.

Answer 1

You need a int*** (or float*** etc)

That is, a pointer to your matrix.

It might help to typedef your matrix, all these stars can get mighty confusing:

typedef int** matrix;

And then all you need is a pointer to `matrix`, or `matrix*` :)