結構

1. 結構定義語法

   struct [structure tag] {
   	member definition;
   	member definition;
   	...
   	member definition;
   } [one or more structure variables];
   

2. 宣告範例：structure 右大括號外，可直接接此 structure 的變數(book)，也可不接變數，在使用時再宣告。

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

3. 存取範例

   [dywang@dyw219 zzz]$ vim struct1.c
   [dywang@dyw219 zzz]$ cat struct1.c
   #include <stdio.h>
   #include <string.h>
   
   struct Books {
   	char  title[50];
   	char  author[50];
   	int   book_id;
   };
    
   int main () {
   	struct Books book1;
   	struct Books book2;
    
   	strcpy( book1.title, "RHCSA");
   	strcpy( book1.author, "dywang"); 
   	book1.book_id = 123456;
   
   	strcpy( book2.title, "Python");
   	strcpy( book2.author, "Linda");
   	book2.book_id = 123321;
    
   	printf( "book1.title : %s\n", book1.title);
   	printf( "book1.author : %s\n", book1.author);
   	printf( "book1.book_id : %d\n", book1.book_id);
   
   	printf( "book2.title : %s\n", book2.title);
   	printf( "book2.author : %s\n", book2.author);
   	printf( "book2.book_id : %d\n", book2.book_id);
   
   	return 0;
   }
   

4. 編譯

   [dywang@dyw219 zzz]$ gcc -o struct1 struct1.c
   

5. 執行結果

   [dywang@dyw219 zzz]$ ./struct1 
   book1.title : RHCSA
   book1.author : dywang
   book1.book_id : 123456
   book2.title : Python
   book2.author : Linda
   book2.book_id : 123321