吴裕雄--天生自然C语言开发：位域

struct
{
  unsigned int widthValidated;
  unsigned int heightValidated;
} status;

struct
{
  unsigned int widthValidated : ;
  unsigned int heightValidated : ;
} status;

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

/* 定义简单的结构 */
struct
{
  unsigned int widthValidated;
  unsigned int heightValidated;
} status1;

/* 定义位域结构 */
struct
{
  unsigned int widthValidated : ;
  unsigned int heightValidated : ;
} status2;

int main( )
{
   printf( "Memory size occupied by status1 : %d\n", sizeof(status1));
   printf( "Memory size occupied by status2 : %d\n", sizeof(status2));

   return ;
}

struct
{
  unsigned int age : ;
} Age;

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

struct
{
  unsigned int age : ;
} Age;

int main( )
{
   Age.age = ;
   printf( "Sizeof( Age ) : %d\n", sizeof(Age) );
   printf( "Age.age : %d\n", Age.age );

   Age.age = ;
   printf( "Age.age : %d\n", Age.age );

   Age.age = ; // 二进制表示为 1000 有四位，超出
   printf( "Age.age : %d\n", Age.age );

   return ;
}