1. ?? shift left
Quoting the library reference :
"There are no routines for shifting bits left or right,
but you can achieve the same effect by multiplying or dividing
by powers of 2."
These are my examples :
1: 5 shifted-left 2 is equal to 20
2: 7 shifted-left 16 is equal to 458752
Now how can you do this with the power() function ??
Bernie
2. Re: ?? shift left
5 * power(2, 2) = 20
7 * power(2, 16) = 458752
so to shift x left by p, use x * power(2, p)
and to shift x right by p, use x / power(2, p)
Jeff Fielding
----- Original Message -----
From: "Bernie Ryan" <xotron at localnet.com>
To: "EUforum" <EUforum at topica.com>
Subject: ?? shift left
>
>
>
> Quoting the library reference :
>
> "There are no routines for shifting bits left or right,
> but you can achieve the same effect by multiplying or dividing
> by powers of 2."
>
>
> These are my examples :
> 1: 5 shifted-left 2 is equal to 20
> 2: 7 shifted-left 16 is equal to 458752
>
> Now how can you do this with the power() function ??
>
> Bernie
>
>
>
>
3. Re: ?? shift left
Something like ...
function shift_bits(integer x, integer steps)
return x * power(2, -steps)
end function
where -ve steps move bits to the left, and +ve to the right.
------
Derek Parnell
Melbourne, Australia
"To finish a job quickly, go slower."
----- Original Message -----
From: "Chris Bensler" <bensler at mailops.com>
To: <EUforum at topica.com>
Sent: Monday, May 14, 2001 10:46 PM
Subject: RE: ?? shift left
>
> How about just shift_bits(x,steps)
> step could positive or negative..
>
> Chris
>
> stabmaster_ at HOTMAIL.COM wrote:
> > How about shl_bits(x, steps) and shr_bits(x, steps) in v. 2.3 ? Or
> > perhaps
> > it should be sal/sar since euphoria integers are signed..
> >
