C语言 day13

//二进制位的奇偶交换
int main() {
    int a = 10;
    //得到偶数位                  得到奇数位 
    int ret = ((a & 0xaaaaaaaa)>>1) + ((a & 0x55555555)<<1);
    printf("%d\n", ret);
}

struct S
{
    int a;
    char b;
    int c;
    char d;
};

//成员相对于首地址的偏移
int main()
{
    printf("%d\n", OFFSETOF(struct S, a));
    printf("%d\n", OFFSETOF(struct S, b));
    printf("%d\n", OFFSETOF(struct S, c));
    printf("%d\n", OFFSETOF(struct S, d));
}