C语言访问结构成员

#include <stdio.h>
#include <string.h>

struct Books {
   char  title[50];
   char  author[50];
   char  subject[100];
   int   book_id;
};

int main( ) {

   struct Books Book1;        /* Declare Book1 of type Book */
   struct Books Book2;        /* Declare Book2 of type Book */

   /* book 1 specification */
   strcpy( Book1.title, C Programming);
   strcpy( Book1.author, Nuha Ali); 
   strcpy( Book1.subject, C Programming Tutorial);
   Book1.book_id = 6495407;

   /* book 2 specification */
   strcpy( Book2.title, Telecom Billing);
   strcpy( Book2.author, Zara Ali);
   strcpy( Book2.subject, Telecom Billing Tutorial);
   Book2.book_id = 6495700;

   /* print Book1 info */
   printf( Book 1 title : %s\n, Book1.title);
   printf( Book 1 author : %s\n, Book1.author);
   printf( Book 1 subject : %s\n, Book1.subject);
   printf( Book 1 book_id : %d\n, Book1.book_id);

   /* print Book2 info */
   printf( Book 2 title : %s\n, Book2.title);
   printf( Book 2 author : %s\n, Book2.author);
   printf( Book 2 subject : %s\n, Book2.subject);
   printf( Book 2 book_id : %d\n, Book2.book_id);

   return 0;
}