Related Notes

Negative representation of byte data type in Java—complement representation

Body

A little explanation of why negative numbers of binary data types are represented in two's complement form

The editor's purpose is to do binary addition and subtraction

Authentication

Use source code

1+(-1)

Obviously the answer is wrong

Use two's complement

1+(-1)

Of course, we need multiple verifications, such as 5-3

Verification successful

That's it, it may seem strange and incomprehensible, but this representation is actually very rigorous and correct, isn't it amazing?

Note

If we use out-of-range binary addition and subtraction, such as 127 + 1

127 + 1