Question

Actually this was another problem but it changed so I decided to open a new question.

My code is

typedef struct inner_list 
{
 int count;
 char word[100];
 inner_list*next;
} inner_list;
typedef struct outer_list
{
 char word [100];
 inner_list * head;
 int count;
 outer_list * next; 
} outer_list;
void delnode(outer_list **head,char num[100])//thanks to both Nir Levy and Jeremy P.
{
    outer_list *temp, *m;
    m=temp=*head; /*FIX #1*/
    while(temp!=NULL) {
        if(strcmp(temp->word,num)==0) {
            if(temp==*head) {
                delinner(temp->head); /* FIX#2 */
    *head=temp->next;

                free(temp);
                return;
            } else {
                delinner(temp->head); /* FIX#2 */ 
    m->next=temp->next;

                free(temp);
                return;
            }
        } else {
            m=temp;
            temp= temp->next;
        }
    }
    printf(" ELEMENT %s NOT FOUND ", num);
}
void delinner(inner_list *head) { /* FIX#2 */
    inner_list *temp;
    temp=head;
    while(temp!=NULL) {
        head=temp->next;
        free(temp);
        temp=head;
    }
}
void delnode2(outer_list *up,inner_list **head,char num[100])
{
    inner_list *temp2,*temp, *m;
 outer_list *p;
 p = up;

 while(p!=NULL){m=temp=temp2=p->head; 
    while(temp!=NULL) {
        if(strcmp(temp->word,num)==0) {
            if(temp==(*head)) {
                *head=temp->next;

                free(temp);
                return;
            } else {
                m->next=temp->next;
                free(temp);
                return;
            }
        } else {
            m=temp;
            temp= temp->next;
        }
    }
 p=p->next;
 }
    printf(" ELEMENT %s NOT FOUND ", num);
}
void print_node(outer_list *parent_node) 
{ 


 while(parent_node!=NULL){
 printf("%s\t%d\t", parent_node->word, parent_node->count);

    inner_list *child_node = parent_node->head;
 printf("list: ");
 if(child_node ==NULL){printf("BUARADA");}

 while (child_node != NULL) {
  printf("%s-%d", child_node->word,child_node->count);

        child_node = child_node->next;

        if (child_node != NULL) {
            printf("->");
        }
 }
    printf("\n");
 parent_node = parent_node->next;
 }
}

While deleting an element from outer list I am also trying the delete the same element from inner_list too.

For example: – Let’s say aaa is an element of outer_list linked list and let’s point it with outer_list *p – This aaa can also be in an inner_list linked list too. (it can be in p->head or another innerlist.) Now, the tricky part again. I tried to apply the same rules with outer_list deletion but whenever i delete the head element of inner_list it gives an error. Where is the wrong thing in print_node or delnode2?

Edit:
actually if it a outer_list node deleted the linked list of inner_list inside of it should be removed too. This is why delinner method used.

For example:

outer     inner
aaa       bb->cc
bb        aaa->cc

when i wanted to delete "aaa" The result should be:
outer     inner
bb         cc 

Answer 1

What is the inner_list **head parameter of delnode() ? I assume that up is the outer list node, from whose inner list you want to remove the node containing the string given in num. head just doesn’t fit into this picture. And you don’t seem to be using it properly anyway. I rewrote the function a bit, omitting the parameter, changing the commented lines, and giving more meaningful names:

void del_inner_node(outer_list *up, char num[100])
{
  inner_list *temp, *m;
  outer_list *p;
  p = up;

  while (p != NULL) {
    m = temp = p->head;
    while(temp!=NULL) {
      if(strcmp(temp->word,num)==0) {
        if(temp==p->head) {   // refer to p->head
          p->head=temp->next; // refer to p->head
          free(temp);
          return;
        } else {
          m->next=temp->next;
          free(temp);
          return;
        }
      } else {
        m=temp;
        temp= temp->next;
      }
    }
    p=p->next;
  }
  printf(" ELEMENT %s NOT FOUND ", num);
}

Note that temp2 is not used, so I removed it.

Now, in your code there is no call to delnode2 (del_inner_node). You could actually call it within delnode, in case the searched string was not found in the current outer node:

void del_all_nodes(outer_list **head,char num[100])//thanks to both Nir Levy and Jeremy P.
{
    ...
    while(temp!=NULL) {
        if(strcmp(temp->word,num)==0) {
            ...
        } else {
            del_inner_node(temp,num);
            m=temp;
            temp= temp->next;
        }
    }
    ...
}

This way you can remove all nodes containing “aaa” with a single call:

outer_list *head;
// set up the lists
del_all_nodes(&head, "aaa");