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Understand the key points of complement

2022-04-23 10:48:00 【A dazed caddie】

What is the complement ？

effect

simplify CPU Arithmetic , It is convenient to use adder inside the computer （ALU） Realize the calculation of negative numbers . Store... In a register in the form of a complement

Representation

The complement of a positive number is itself ;
A negative complement ： Add... On the basis of its inverse code 1
Value range ：-127~127 Corresponding （0x80~0x7f）

give an example ：

-1-2 =（-1）+（-2）= (0X11111111) repair +（0X11111110） repair = （0X11111101 ） repair = （0X11111100） back = （0X10000011） primary = -3

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