二进制补码 [英] two's complement

问题描述

据我所知，补码算法是:

As far as I know, the two's complement algo is:

1.用二进制表示十进制.
2.反转所有位.
3.最后一位加1.

1.Represent the decimal in binary.
2.Inverse all bits.
3.Add 1 to the last bit.

对于数字 3，其表示形式为:0000000000000011 二进制补码的结果将是 1111111111111101，即 -3.
到现在为止还挺好.但是对于表示为 0000000000000010 的数字 2，二进制补码的结果将是 1111111111111101，它不是 2 而是 -3.
我做错了什么?

For the number 3, which its representation is: 0000000000000011 the result of the two's complement would be 1111111111111101 which is -3.
So far so good. But for the number 2 which its representation is 0000000000000010 the result of the two's complement would be 1111111111111101, which isn't 2 but -3.
What am I doing wrong?

推荐答案

0...0010 // 2
1...1101 // Flip the bits
1...1110 // Add one

它也适用于负面:

1...1110 // -2
0...0001 // Flip the bits
0...0010 // Add one

这篇关于二进制补码的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！