Re: [bug-gawk] bitwise operations

[Davide Brini]

On Wed, 15 Feb 2012 10:40:21 +0100 (CET), address@hidden wrote:

> 
> Hello, 
> 
> I have read 
> http://www.gnu.org/software/gawk/manual/html_node/Bitwise-Functions.html 
> 
> I need something similar as in the example given there. 
> However, I do it in a differrent way. 
> However, I not very succesfull: the code gives wrong results. 
> I'm wondering why. The code: 
> 
> #! /bin/sh 
> gawk ' 
>   BEGIN { 
>     number = 2 
>     print "number = "number 
> 
> 
>     bit_0 = ((number && 1) == 0 ? 0 : 1) 
>     bit_1 = ((number && 2) == 0 ? 0 : 1) 
>     bit_2 = (number && 4 ? 1 : 0) 
>     bit_3 = (number && 8 ? 1 : 0) 
> 
> 
>     print "bit 0 = "bit_0 
>     print "bit 1 = "bit_1 
>     print "bit 2 = "bit_2 
>     print "bit 3 = "bit_3 
>   } 
> ' 
> 
> The obtained values for bit_0 ... bit_3 are 
> always wrong, regardless of number. 
> Why is this not working correctly? 

The "&&" operator is a logical AND, not a bitwise operator.

-- 
D.