a problem with pointers

carter88 · 12-02-2009, 05:59 AM

I have a doublylinked-list which i already inserted some values, but when i try to make search&update this loop does not terminate

Code:

if(head!=NULL)
    {
        temp = head;
        while(temp!=NULL)
        {
            if(temp->row==i)
                temp->data = 100;
            else
                 temp=temp->next;
        }
    }

although i get 0 when i check tail->next, temp never becomes NULL. How can i solve this problem?

Dino · 12-02-2009, 06:36 AM

If temp never becomes null, then your list must be self referencing and you are going into a loop.

12-02-2009, 05:59 AM	#1
carter88 Registered User Join Date: Dec 2009 Posts: 5	a problem with pointers I have a doublylinked-list which i already inserted some values, but when i try to make search&update this loop does not terminate Code: if(head!=NULL) { temp = head; while(temp!=NULL) { if(temp->row==i) temp->data = 100; else temp=temp->next; } } although i get 0 when i check tail->next, temp never becomes NULL. How can i solve this problem?
carter88 is offline

12-02-2009, 06:36 AM	#2
Dino Jack of many languages Join Date: Nov 2007 Location: Katy, Texas Posts: 2,131	If temp never becomes null, then your list must be self referencing and you are going into a loop. __________________ Mac and Windows cross platform programmer. Ruby lover.
Dino is offline

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