Thread: Implicit declaration HELP PLZ

Hey there i'm creating a linked list and I'm stuck here.
please look at the code below and explain what the problem is.
it tells me on

Code:

 if (loc > (length()+1) || loc <= 0)

"implicit declaration of function length is invalid in C99"

plz help

here's the code

Code:

void add_at(char info[100], int loc)
{
    int i;
    struct Node *temp, *prev_ptr, *cur_ptr;
    
    cur_ptr = Head;
    
    if (loc > (length()+1) || loc <= 0)
    {
        printf("\n Insertion at given location is invalid\n");
    }
    else
    {
        if (loc == 1)     // If the location is starting of the list
        {
            insert_beg(&info[100]);
        }
        else
        {
            for (i=1; i<loc; i++)
            {
                prev_ptr = cur_ptr;
                cur_ptr = cur_ptr->next;
            }
            temp = (struct Node *)malloc(sizeof(struct Node));
            temp->data = info[100];
            
            prev_ptr->next = temp;
            temp->next = cur_ptr;
        }
    }
}

hope i'm clear on this post.
please let me know
thanks

true my bad i\m an idiot i completely forgot about that!
wow not much sleep