Linked List

[andrenvq57]

hi all, I have a function that append node to a linked list like this:

struct ListNode{
int value;
struct ListNode* next;
};

void appendNode(struct ListNode* head, int num){
struct ListNode* nodePtr;
struct ListNode* newNode;
newNode = malloc(sizeof(struct ListNode));
newNode->value = num;
newNode->next = NULL;

if(!head)
head = newNode;
else{
nodePtr = head;
while(nodePtr->next)
nodePtr = nodePtr->next;
nodePtr->next = newNode;
}
}

int main(){
struct ListNode* head;
head = NULL;
appendNode(head, 5);
printf("%p", head);

return 0;
}

when I use it, the head in main() does not change its address and it's still pointing to NULL. Why??

[Script Coder]

Please use code tags.

Have not read your code (due to lack of code tags) but this should help:
http://www.cplusplus.com/articles/Lw6AC542/

[andrenvq57]

http://pastebin.com/uW9P7V5J

[gtm]

oh please, its not THAT hard to read without the code tags

[Script Coder]

@gtm its not, it is however common practice and decency, to make it easier for someone from whom you want help and in addition I do believe I gave the OP a resource from which they will more than likely get their answer.

[ne555]

> the head in main() does not change its address value and it's still pointing to NULL. Why??
The function is modifying a copy of the pointer.