#include <stdio.h>
#include <string.h>
 
typedef struct Books
{
   char  title[50];
   char  author[50];
   char  subject[100];
   int   book_id;
} Book,*x;
 
int main( )
{
   Book book;
   Book *xx;
 
   strcpy( book.title, "C Programming");
   strcpy( book.author, "Nuha Ali");
   strcpy( book.subject, "C Programming Tutorial");
   book.book_id = 6495407;
   printf("\n");
   x a;
   a=&book;
   strcpy(a->author,"人人人");
 //  xx=&book;
 //  strcpy( xx->title, "字符串");
  // x=&book;
   //strcpy(x->author,"天高地");
   
      //Bood xx;
  // scanf("%s",xx.title);
  // printf("%s",xx->book_id);
   
   
   
   
 
   printf( "Book title : %s\n", book.title);
   printf( "Book author : %s\n", book.author);
   printf( "Book subject : %s\n", book.subject);
   printf( "Book book_id : %d\n", book.book_id);

   return 0;
}

你这个代码那么乱，想测试什么呀？