C语言，struct 结构体、union共用体的使用

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//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

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

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