自完成代码 [英] self completing code

问题描述

https://electronics.stackexchange.com/questions/20537/how识别自我补码

我已正确阅读，

但是是否有必要从9中减去数字?

but is it necessary that , the number need to be subtracted from 9 ?

因为是8421系统 12 = 1100

because in the 8421 system 12= 1100

如果我们减去15-12，则答案为3，即0011.

and if we subtract 15-12 , then the answer is 3 , which is 0011 .

所以它也是自我补充...

so it is also self complementing...

我不明白，给定数字需要从哪个数字中减去，该数字是否必须为9?

I don't understand that , the given number need to be subtracted from which number , is that number neccessary to be 9 ???

推荐答案

如果权重之和为9，则它是自补的 例如5211 =(5 + 2 + 1 + 1)= 9或2421 =(2 + 4 + 2 + 1)= 9 8421不是自我补充，所以，8421！= 9.

If the sum of the weights is 9 then it is self complementing e.g 5211=(5+2+1+1)=9 or 2421=(2+4+2+1)=9 8421 is not self complementing so ,8421!=9.

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