结构体为每个成员保留单独的内存段，union为其最大成员保留单个内存空间。使用关键字union创建联合体。
以下代码为电话簿创建联合体定义。
union phoneBook {
char *name;
char *number;
char *address;
};
通过点(.)运算符访问联合体成员。
#include <stdio.h>
union phoneBook {
char *name;
char *number;
char *address;
};
struct magazine {
char *name;
char *author;
int isbn;
};
int main()
{
union phoneBook aBook;
struct magazine aMagazine;
printf(\nUnion Details\n);
printf(Address for aBook.name: %p\n, &aBook.name);
printf(Address for aBook.number: %p\n, &aBook.number);
printf(Address for aBook.address: %p\n, &aBook.address);
printf(\nStructure Details\n);
printf(Address for aMagazine.name: %p\n, &aMagazine.name);
printf(Address for aMagazine.author: %p\n, &aMagazine.author);
printf(Address for aMagazine.isbn: %p\n, &aMagazine.isbn);
} //end main
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