Two's Complement

[dcx2]

Bits are just bits.  By themselves, they have no meaning.  It is how you treat the bits that matters.

For instance, consider the 8-bit value 0x41.  In binary, this is 0100 0001.  If you treat this value as a signed integer, it is 65.  If you treat it as an unsigned integer, it is 65.  If you treat it as an ASCII character, it is the letter A.  It's as if 0x41 has multiple personalities!

Now consider the 8-bit value 0xFE.  In binary, this is 1111 1110.  If you treat it as a signed integer, it is -2.  If you treat it as unsigned, it is 254.  If you treat it as ASCII, you get garbage; ASCII only defines 0x00 through 0x7F.

[doomkaiber001]

Ok, what on earth is ASCII?

[James0x57]

It's one set (most common, I think..) of universal binary values for plain text characters. http://www.asciitable.com/
More info at google.


@dcx2
https://developer.mozilla.org/en/JavaScript_typed_arrays/ArrayBufferView
Sexy, right? JavaScript 2.0 ftw! haha

[doomkaiber001]

Are the symbols in red ASCII? Do I need to actually know about it to hack?

[James0x57]

No.

Unless you want to hack the text in the game.

[doomkaiber001]

Well, there's probably no use in that then... Ok, thanks for explaining everything to me!

[benny3t3]

Hacking the text in a game, that sounds cool. Maybe I'll look into that sometime...

[megazig]

Ok, I googled signed integers and found the following out;

10000000 could be a signed integer, because the bit on the far left (Sign Bit) is a one.

00000001 has to be a unsigned integer, because the sign bit is a zero.


So, how would you put a negative hex into a code using the Wiird GUI?

assuming binary notation
00000001 can be signed too, just that it's a positive signed char (+1)