Why isn't my pointer NULL?

Question

I have a linked list of families. I delete one of the childs siblings like so.

p->myWife->myChildren=p->myWife->myChildren->mySibling; //makes the sibling the child so the list is not broken when deleting delete p->myWife->myChildren->mySibling;

and later i print the child/siblings attributes based upon this

if(p->myWife->myChildren->mySibling!=NULL){ print the childs attributes }

Whenever I print though, it prints a weird number for the sibling (im assuming its a memory address) What do I need to do to make that pointer null?

See: stackoverflow.com/questions/704466/…

Bill Lynch
– Bill Lynch

2011-05-11 04:02:35 +00:00
Commented May 11, 2011 at 4:02 — Bill Lynch
– Bill Lynch, Commented May 11, 2011 at 4:02

Aater Suleman · Accepted Answer · 2011-05-11 04:01:20Z

Deleting a pointer doesn't set it to zero. It just deallocates the memory being pointed to by the pointer. To set it to NULL you will have to set it to NULL yourself.

p->myWife->myChildren->mySibling = NULL /*defined to be zero */;

dlev · Accepted Answer · 2011-05-11 04:02:05Z

deleting frees the memory referenced by the pointer. To make the pointer be NULL, assign it NULL!

p->myWife->myChildren->mySibling = NULL;

Prince John Wesley · Accepted Answer · 2011-05-11 04:02:42Z

2

After deleting, set the pointer as NULL

p->myWife->myChildren->mySibling = NULL;

answered May 11, 2011 at 4:02

Prince John Wesley

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