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;
}