Binary to decimal, decimal to binary

Binary to decimal

Decimal to binary

The rules

One 、 Other decimal system to decimal system
1. Binary to decimal
The rules ： Let's start at the lowest point ( On the right ), Extract the number in each bit , multiply 2 Of ( digit -1) Power , Then sum it
Example ：1010 Convert to decimal
1010 ===> 0X2 1-1 + 1X22-1 + 0X23-1 + 1X24-1 = 10
2. Octal to decimal
The rules : Let's start at the lowest point ( On the right ), Extract the number in each bit , multiply 8 Of ( digit -1) Power , Then sum it
Example : 17 Convert to decimal
17 ===> 7X81-1 + 1X82-1 = 7 + 8 = 15
3. Hexadecimal to decimal
The rules : Let's start at the lowest point ( On the right ), Extract the number in each bit , multiply 16 Of ( digit -1) Power , Then sum it
Example ：1AF Convert to Decimal system
1AF ===> 15X161-1 + 10X162-1 + 1X 163-1 = 15+160+256= 431
Two 、 Decimal to other bases
The rules ： Divide the number that needs to be converted by 2/8/16( Binary system / octal / Hexadecimal ), Until Shang Wei 0, Then reverse the remainder of each step to the corresponding hexadecimal number