正数的原码，反码和补码相等：[+1] = [00000001]原 = [00000001]反 = [00000001]补 负数的反码等于原码的符号位不变，其余位取反，补码是反码+1：[-1] = [10000001]原 = [11111110]反 = [11111111]补 https://blog.csdn.net/zl10086111/article/details/80907428
