//状态字节，根据数据定义几个标志，标志位依据联合体内部结构体进行变量定义
//目的，节省内存空间，省去特定字节
c
struct STATDATA
{
union
{
unsigned char stat;
struct
{
unsigned stat0:1;
unsigned stat1:1;
unsigned stat2:1;
unsigned stat3:1;
unsigned stat4:1;
unsigned stat5:1;
unsigned stat6:1;
unsigned stat7:1;
};
};
};
struct STATDATA STATDATA1;
struct STATDATA STATDATA2;
int main(void)
{
STATDATA1.stat = 0x55;
STATDATA2.stat = 0xAA;
printf("STATDATA1.stat0 = %d\n",STATDATA1.stat0);
printf("STATDATA1.stat1 = %d\n",STATDATA1.stat1);
printf("STATDATA1.stat2 = %d\n",STATDATA1.stat2);
printf("STATDATA1.stat3 = %d\n",STATDATA1.stat3);
printf("STATDATA1.stat4 = %d\n",STATDATA1.stat4);
printf("STATDATA1.stat5 = %d\n",STATDATA1.stat5);
printf("STATDATA1.stat6 = %d\n",STATDATA1.stat6);
printf("STATDATA1.stat7 = %d\n",STATDATA1.stat7);
printf("STATDATA2.stat0 = %d\n",STATDATA2.stat0);
printf("STATDATA2.stat1 = %d\n",STATDATA2.stat1);
printf("STATDATA2.stat2 = %d\n",STATDATA2.stat2);
printf("STATDATA2.stat3 = %d\n",STATDATA2.stat3);
printf("STATDATA2.stat4 = %d\n",STATDATA2.stat4);
printf("STATDATA2.stat5 = %d\n",STATDATA2.stat5);
printf("STATDATA2.stat6 = %d\n",STATDATA2.stat6);
printf("STATDATA2.stat7 = %d\n",STATDATA2.stat7);
return 0;
}// 输出结果：
// STATDATA1.stat0 = 1
// STATDATA1.stat1 = 0
// STATDATA1.stat2 = 1
// STATDATA1.stat3 = 0
// STATDATA1.stat4 = 1
// STATDATA1.stat5 = 0
// STATDATA1.stat6 = 1
// STATDATA1.stat7 = 0
// STATDATA2.stat0 = 0
// STATDATA2.stat1 = 1
// STATDATA2.stat2 = 0
// STATDATA2.stat3 = 1
// STATDATA2.stat4 = 0
// STATDATA2.stat5 = 1
// STATDATA2.stat6 = 0
// STATDATA2.stat7 = 1
