我的程序一段struct定义如下，可是编译的时候一直说定义有问题，全部改为如bit flag就好了，请问这个定义哪里错了！
typedef struct
  {
    unsigned bit0        :1;
    unsigned bit1        :1;
    unsigned bit2        :1;
    unsigned bit3        :1;
    unsigned bit4        :1;
    unsigned bit5        :1;
    unsigned bit6        :1;
    unsigned bit7       :1;
  }Boot;
Boot B;
#define time_10ms_f  B.bit0;
#define flag  B.bit1;
#define OLDA  B.bit2;
#define OLDB  B.bit3;
#define OLDZ  B.bit4;
#define circle B.bit5;