推荐订阅源

void print2(unsigned char a)

{

    int r[8];

    r[0] = ( a & (0x01 << 0)) >> 0; // 最低位

    r[1] = ( a & (0x01 << 1)) >> 1;

    r[2] = ( a & (0x01 << 2)) >> 2;

    r[3] = ( a & (0x01 << 3)) >> 3;

    r[4] = ( a & (0x01 << 4)) >> 4;

    r[5] = ( a & (0x01 << 5)) >> 5;

    r[6] = ( a & (0x01 << 6)) >> 6;

    r[7] = ( a & (0x01 << 7)) >> 7;  // 最高位

    printf("%d %d %d %d   %d %d %d %d\n",r[7],r[6],r[5],r[4],r[3],r[2],r[1],r[0]);

}

int main(void)

{

    unsigned char a = 0xBF;

    print2(a);

    unsigned char b = a | (0x01 << 6); //set on

    print2(b);

   b = a | (0x01 << 2); //set off 1

   unsigned char c = b ^ (0x01 << 2); //set off 2 ( 先set on 在 ^ )

    print2(c);

}

output:

1 0 1 1   1 0 1 1   //0xBF

1 1 1 1   1 1 1 1

1 1 1 1   1 0 1 1