Converting int to unsigned int

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3 total messages Started by Rick Wed, 15 Jun 2005 13:00

#518

Author: Rick
Date: Wed, 15 Jun 2005 13:00

14 lines
1304 bytes

Hi,

Probably a simple question: how to convert a signed int to an unsigned int?

My applets gets a string value holding a 16-bits integer value. Before I 
want to display it, this value needs to be converted to an unsigned int(16 
bits) and then back in a string. So the input string "32767" becomes 
"65535".
I thought the conversion would be this,
    uint16    = int16 * 2 +1
but I'm not sure though

Greetings,
Rick

Re: Converting int to unsigned int

#519

Author: Alexey N. Solofnenko
Date: Wed, 15 Jun 2005 14:06

26 lines
1674 bytes

I would suggest: (value>=0 ? value : 65536+value). 32767 should not be 
changed - it is already a positive integer, but -1 is actually 65535.

- Alexey.

Rick wrote:
> Hi,
> 
> Probably a simple question: how to convert a signed int to an unsigned int?
> 
> My applets gets a string value holding a 16-bits integer value. Before I 
> want to display it, this value needs to be converted to an unsigned int(16 
> bits) and then back in a string. So the input string "32767" becomes 
> "65535".
> I thought the conversion would be this,
>     uint16    = int16 * 2 +1
> but I'm not sure though
> 
> Greetings,
> Rick 
> 
> 

-- 
Alexey N. Solofnenko
home: http://trelony.cjb.net/

Re: Converting int to unsigned int

#520

Author: Shankar Unni
Date: Wed, 15 Jun 2005 21:37

13 lines
1227 bytes

Rick wrote:

> I thought the conversion would be this,
>     uint16    = int16 * 2 +1
> but I'm not sure though

FAQ.

   uint16 = int16 & 0xffff;

Ditto for "signed bytes to unsigned bytes":

   ubyte = sbyte & 0xff;

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