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Original code, inverse code, complement code

2022-07-19 02:00:00 【Monastic -0323】

Preface

For positive numbers , Original code , Inverse code , The binary storage form of complement is the same , This article will not be repeated .
For negative numbers , Because there is only an addition calculator in the computer circuit , In order to add negative parameters , Inverse code , Complement came into being .
After unification , Integer type data is stored in binary form in the computer in the form of complement .

1. Original code

highest （ Leftmost ） The sign bit .0 Being positive ,1 Negative .

2. Inverse code

The sign bits remain the same , The rest of the bits are reversed .

3. Complement code

Add one to the last bit of the inverse code ;（ The final storage form of computer ）

Compare with the following table , You can quickly understand the original code , Inverse code , Complement related information .

+1-1+0-0
Original code 0000 00011000 00010000 00001000 0000
Inverse code 0000 00011111 11100000 00001111 1111
Complement code 0000 00011111 11110000 00000000 0000
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