[Gambas-user] Bit manipulation functions

[Jussi Lahtinen]

Argh... no.
Try this:
? bin(Lsr(-9,1),32)
01111111111111111111111111111011

Jussi


On Sat, Nov 20, 2010 at 17:55, Jussi Lahtinen <jussi.lahtinen at ...626...>wrote:

>
>   PRINT "Bin(-9)        :"; Bin(-9)
>>  PRINT "Bin(Lsl(-9, 1)):"; Bin(Lsl(-9, 1))
>>  PRINT "Bin(Lsr(-9, 1)):"; Bin(Lsr(-9, 1))
>>
>> Bin(-9)
>> :1111111111111111111111111111111111111111111111111111111111110111
>>
>> Bin(Lsl(-9,1)):1111111111111111111111111111111111111111111111111111111111101110
>> Bin(Lsr(-9,1)):1111111111111111111111111111011
>>
>> Lsl is correct, it adds a 0 at the right and shift binary to left
>> Lsr i think is wrong
>>
>> -9 is
>> 1111111111111111111111111111111111111111111111111111111111110111
>>
>> Lsr(-9,1) should be
>> 0111111111111111111111111111111111111111111111111111111111111011
>>
>>
> I think the sign bit shouldn't be shifted. So this is correct.
>
> Jussi
>
>