Re: Pointers == NULL upon function return?

•

What is DaniWeb IT Discussion Community?

You're currently browsing the C section within the Software Development category of DaniWeb, a massive community of 391,785 software developers, web developers, Internet marketers, and tech gurus who are all enthusiastic about making contacts, networking, and learning from each other. In fact, there are 3,558 IT professionals currently interacting right now! Registration is free, only takes a minute and lets you enjoy all of the interactive features of the site.

Join our community!

Please support our C advertiser:

Pointers == NULL upon function return?

•

Join Date: Apr 2006

Location: Canada

Posts: 4,446

Reputation: John A is a glorious beacon of light

Rep Power: 15

Solved Threads: 265

John A

Offline

Vampirical Moderator

Re: Pointers == NULL upon function return?

May 8th, 2008

That's because the memory address contained in the pointer is lost when the function is popped off the stack. In other words, you can modify the value that the pointer points to, but you can't modify the memory address that the pointer holds (well, you can, but the change won't have any effect on the pointer in the parent function).

The solution to this would be to use a pointer of a pointer.

Last edited by John A : May 8th, 2008 at 6:35 pm.

tuxation.com - Linux articles, tutorials, and discussions

Forum Highlights

Related Features

DANIWEB FEATURE INDEX

Statistics

Members: 391,785

Users Online Now: 3,558

Active IRC Users: 19

Forum Threads: 128,005

Forum Posts: 657,836

Code Snippets: 877

Blogs: 146

Blog Entries: 2,059

Directory Links: 562

DaniWeb Home > Forums > Software Development > C > Pointers == NULL upon...

Re: Pointers == NULL upon function return?

Pointers == NULL upon function return?

Re: Pointers == NULL upon function return?