Pointer to Pointer

[rafael_josem]

Hi, I'd like to know when I have to use pointer to pointers. I mean, how do I know when to use a single pointer and a pointer to pointer.

Thanks...

[itsme86]

One example is if you need to change the value of a pointer via a separate function, you'll need to pass a pointer to the pointer to your function.

[divineleft]

Hi, I'd like to know when I have to use pointer to pointers. I mean, how do I know when to use a single pointer and a pointer to pointer.

Thanks...

if you need to use multidimensional arrays, or like itsme86 said when you need to change a pointer's value in a function. typically the pointer to a pointer would be in the function itself and you would just pass the reference (&) of the pointer to the function.

[zacs7]

Techincally its not a reference in C, rather the address.

http://www.hermetic.ch/cfunlib/ast_amp.htm