Thread: need help about structure..Thanks

hi..i am very beginner with c structure and i don't how to deal with complex struct as follow

Code:

typedef struct saleStruct
{
   struct tm date;
   int quantity;
   float price;
   struct saleStruct* next;
} SaleType;

typedef struct bookStruct
{
   int id;
   char title[TITLE_LEN + 1];
   char author[AUTHOR_LEN + 1];
   int year;
   float price;
   int count;
   SaleType* head;
   struct bookStruct* next;
} BookType;

typedef struct bookListStruct
{
   BookType* head;
   int count;
} BookListType;

	
Code:
	
/* can i do like this?? */
 BookType *head = NULL, *current, *previous;

how do i need to access through BookType id using
BookListType *booklist , i had try using "booklist->BookType"
but fail or maybe wrong..can gave some tips..Thanks...

oo..ok..thanks..alot

Code:

BookListType* bookList = NULL;
BookType* example = malloc(sizeof(BookType));
bookList->head = example;
bookList->head->id = 5;

I have read throught link list, but I was wondering how can one insert values into the next node from BookListType structure.

You mean like this?

Code:

BookListType booklist;  /* create a book list */
BookType *book;    /* pointer to a book */

/* ... initialize booklist, add data in ... */

book = &booklist.head;  /* set bok to the beginning of the linked list */

while(book) {  /* while the end of the list has not been reached */
    printf("%s", book->title);  /* print the title of the book */
    /* ... print the other data members ...*/
    book = book->next;    /* advance to the next book */
}

Whatever you do, don't forget to free everything you malloc()ed at the end with free().

ok..thanks