Data representation and calculation (base)

1. Bytes and bits

Bit is the smallest unit , Bytes are the most basic unit .

2. Base number

Decimal is every few into one .





3. Two 、 8、 ... and 、 Hexadecimal to decimal





The law of the power of each bit









4. Decimal to two 、 8、 ... and 、 Hexadecimal





5. Two 、 8、 ... and 、 Hexadecimal relation





6. Original code 、 Inverse code 、 Complement code 、 Shift the code

① Original code

advantage ： Easy to convert with truth value .

shortcoming ： Such as ②

② The relationship between