[Caml-list] How do I convert 0x hexadecimal integers to decimal integers ?

[Caml-list] How do I convert 0x hexadecimal integers to decimal integers ?

[Stalkern 2]

Hello to everybody 
I'd  need a function to turn hexadecimal integers like 
	0xb8f99c 
( a Color in hexadecimal notation) to integer 3ples (e.g. `RGB 
(184*256,249*256,156*256), always a color).

Shall I use Scanf functions and then some function converting hexadecimal 
numbers to decimal? what would this function be?

T I A
Ernesto

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Re: [Caml-list] How do I convert 0x hexadecimal integers to decimal integers ?

[Stalkern 2]

Il  Thursday 27 March 2003 18:20, Stalkern 2 ha scritto:
> Hello to everybody
> I'd  need a function to turn hexadecimal integers like
> 	0xb8f99c
> ( a Color in hexadecimal notation) to integer 3ples (e.g. `RGB
> (184*256,249*256,156*256), always a color).
>
> Shall I use Scanf functions and then some function converting hexadecimal
> numbers to decimal? what would this function be?

Well I see that I can also use String.sub but my problem would still be to 
convert a hexadecimal integer like 0xb8f99c into a string like "0xb8f99c", 
avoiding things like 
	# string_of_int 0xffffff;;
 	- : string = "16777215"
because in this case I don't know how to recognize the 3 integers that are 
side by side... are they side by side because of a convention or is there a 
way to convert "16777215" into the triple that I'm looking for?

T I A 
Ernesto

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Re: [Caml-list] How do I convert 0x hexadecimal integers to decimal integers ?

[Jun Furuse]

> > I'd  need a function to turn hexadecimal integers like
> > 	0xb8f99c
> > ( a Color in hexadecimal notation) to integer 3ples (e.g. `RGB
> > (184*256,249*256,156*256), always a color).
> >
> > Shall I use Scanf functions and then some function converting hexadecimal
> > numbers to decimal? what would this function be?

let hex = 0xb8f99c in
let b = hex land 0xff in
let g = (hex lsr 8) land 0xff in
let r = (hex lsr 16) land 0xff in
`RGB (r lsl 8, g lsl 8, b, lsl 8)

BTW, if I prefere the following to get the conversion [0..255] => [0..65535]:

`RGB (r lsl 8 + r, g lsl 8 + g, b lsl 8 + b)

--
jun

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Re: [Caml-list] How do I convert 0x hexadecimal integers to decimal integers ?

[Brian Hurt]

Or maybe you want to do this:

let hexstring_of_int x = Printf.sprintf "%x" x ;;

Although once I got the integer into binary int form, I wouldn't convert 
it back to a string untill I was printing the answer back.  I would 
instead do the shift/and code instead.

Brian


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Re: [Caml-list] How do I convert 0x hexadecimal integers to decimal integers ?

[Stalkern 2]

Il  Thursday 27 March 2003 18:57, Pixel ha scritto:
[...]

Thanks to everybody, I'll paint a lot now!

Ernesto 

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