How to represent a negative number in binary?

1

123qwe2015-10-10 12:48:10

Programming

123qwe, 2015-10-10 12:48:10

What's up, software.
Take for example 7.
int a = 7; (4 bytes)
7 would look like this - 00000000 00000000 00000000 00000111.
-7 would look like this - 00000000 00000000 10000000 00000111. Yes? not sure.
If I'm right, is it that simple, or are there some tricks with some numbers?
Give a couple of examples, pliiz. I'm trying to deal with the fundamentals.

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3 answer(s)

A

Andrey Pavlenko, 2015-10-10
@Akdmeh

Lots of subtleties. In a nutshell - it all depends on the device you are using.
https://ru.wikipedia.org/wiki/%D0%94%D0%B2%D0%BE%D...
inf1.info/additionalcode
Here are two articles on the subject.

T

Tlito, 2015-10-10
@tlito

https://en.wikipedia.org/wiki/%D0%94%D0%BE%D0%BF%D...

A

Anton Fedoryan, 2015-10-12
@AnnTHony

If you use the calculator in the "programmer" mode, the result will be:
+7: 00000000 00000111
-7: 11111111 11111001
I.e. we take the original number modulo, invert all bits and add one.