The storage of integers ：

      There are three ways to represent integers in a computer ： Original code 、 Inverse code 、 Complement code . Integers are all used Complement code In memory . The original inverse complement of positive numbers is the same , The original inverse complement of negative numbers needs to be converted , The conversion rules are as follows ：

Inverse code is to keep the sign bit of the original code unchanged , The remaining binary bits are reversed by bit .

Complement is the binary bit of inverse code +1..

Why integers are stored in memory in the form of complement ？

      Because when adding and subtracting ,cpu You can only process addition, not subtraction （cpu Only adders ）, And the original code and the inverse code are converted in the same way , No need for additional hardware circuits .

Introduction of big end and small end ：

      When we know that integers are stored in memory with complements , How is it stored in memory ？ Now I want to introduce the concepts of big end storage and small end storage , Tell us how it is stored .

    Big end ： The low byte order is stored at the high address of the memory address , The high byte order is stored at the low address of the memory address .                The small end ： The low byte order is stored at the low address of the memory address , The high byte order is stored at the high address of the memory address .

    At this time, the middle of my machine a The value of is stored upside down , The low byte order is stored at the low address of the memory address , So it's small end storage .

Floating point storage ：