Thread: Linked list problem adding nodes

Hi all, I wrote function to add to elements in the list, but when I call printList function it returns me empty list ! I'm new with linked list in C so I need help and advices ...Thx

Output:

Empty list
List is empty add element at the begining
New node with packet num 245
List is not empty add element at the end
New node with packet num 486

Linked list: Empty




Main:

Code:

int main(){

struct node * start ;
start = NULL;
int i;

/*Check if list is empty*/
if(start == NULL){
    printf("Empty list\n");
}else{
    printf("List is not empty!\n");
}

start = add_node(start,245);
printf("New node with number %ld\n",start->num);

start = add_node(start,486);
printf("New node with  number %ld\n",start->num);

printList(start);

return 0;

}

add_node and printList functions:

Code:

struct node * add_node(struct node * start, int num) {

    struct node * temp, *p;
    int i;
    temp = (struct node *) malloc(sizeof (struct node));

    //Enter new value
    temp->info = num;

    if (start == NULL) {
        printf("List is empty add element at the begining\n");
        temp->next = NULL; // start = NULL, new element is the last and must point at NULL
        start = temp; // start now points not to NULL but to new added element
        return start;

    } 
     // Add element to the end of the list
     else {
        printf("List is not empty add element at the end\n");
        p = start;
     
        while (p->next != NULL) {
            p = p->next;
        }
        temp->next = NULL;
        p->next = temp;
        return temp;
      
     }
}


void printList(struct node *start) {

    struct node *tmp = start->next;
    printf("Linked list: ");

    if (start->next == NULL) {
        printf("Empty");
    } else {

        while (tmp != NULL) {
            printf("%d ", tmp->info);
            tmp = tmp->next;
        }
    }
    printf("\n");
}

I changed 1. and 2. and it works now, thanks !