Assembly language - Beginner's introduction

One 、 Base number

1、 Why do you want to learn

Computers only know binary , That is to say 0 and 1, In order to learn computer better , First of all, we should have a deep understanding of Radix .

2、 Precautions for learning Radix

  If you want to learn Radix well, you must first forget the decimal system , Also forget the conversion between base numbers , Because every binary is perfect .

3、 The definition of base

Definition of octal ： It consists of eight symbols , Namely 0  1  2  3  4  5  6  7  Every eight enters one. .

The definition of decimal ： It consists of eight symbols , Namely 0  1  2  3  4  5  6  7  8  9  Dot into one .

N The definition of base ： from N It's a symbol , Meet N Jin Yi .

4、 The writing of decimal system

Eg;

One base （1~6）：1  11  111 1111  11111  111111 

Binary system （1~8）：0000  0001  0010  0011  0101  0110  0111 1000

Ternary （1~12）：0  1  2  10  11  12  20  21  22  100  101 102

5、 Base operation

Why do we skillfully calculate the addition, subtraction, multiplication and division of decimal , It's because we recited the multiplication table when we were young , So when we do other binary calculations, we can also recite the relevant operation tables .

eg: octal

Add ：

Multiplication ：

Two 、 Binary abbreviation

1、 Why do computers use binary

Computers need electricity , The circuit has only two states ：1  really （ Electrify ）0（ No power ）

Any file stored in the computer 、 Any instructions received are from 0 and 1 Composed of

2、 The relationship between binary and hexadecimal

Binary system （1~15）：0000  0001  0010  0011  0101  0110  0111 1000  1001  1010  1011  1100  1101 1110  1111

Hexadecimal （1~15)：1  2  3  4  5  6  7  8  9  A  B  C  D  E  F

Binary is too cumbersome , Hexadecimal can be regarded as a short form of binary .