2's complement of Hexadecimal numbers

[capellan]

Hi All,

Did Livecode includes a function to calculate the
2's complement of an Hexadecimal number?

https://www.cs.cornell.edu/~tomf/notes/ ... scomp.html

Thanks in advance!

Al

[FourthWorld]

Seems useful for lower level computation, by what are the applications of such a function in a scripting language?

[capellan]

I will use this for calculating the negative height of BMP files.
https://stackoverflow.com/questions/373 ... age-in-hex

Mac OSX Preview and GIMP opens fine these BMP with
Transparency and negative Height.

https://drive.google.com/file/d/1XiBVh6 ... sp=sharing

EDIT: This code could work, but requires more testing:

Code: Select all

put baseconvert(((bitnot 326) + 1),10,16)

[FourthWorld]

Curious. It hadn't occurred to me that an image format would use negative numbers. Thanks.

[dunbarx]

Hi.
Simple to write a function. With a field with a hex string and this in a button script:

Code: Select all

on mouseUp
   get baseConvert(fld 1,16,2)
   replace "0" with "x" in it
   replace 1 with 0 in it
   replace "x" with 1 in it
   
   put baseConvert(it,2,10) into temp
   answer baseConvert(temp + 1,10,2)
end mouseUp

Craig

EDIT.

Rewrote handler because I did not see at first the initial string was in hex.

[capellan]

Hi Craig,

Many Thanks for posting your script!
I ended up using this handler:

Code: Select all

on mouseUp 
   put baseconvert(((bitnot fld 1) + 1),10,16)
end mouseUp

[dunbarx]

Hi.

Yes, "bitNot" reduces the number of lines required to, er, not the bits.

Craig