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Re: [Chicken-users] long pointer equivalent
From: |
felix |
Subject: |
Re: [Chicken-users] long pointer equivalent |
Date: |
Tue, 27 Aug 2002 09:00:24 +0200 |
> "felix" <address@hidden> writes:
> > > Well, it can't be a float in that if you're doing lseeks you really
> > > want to specify which block in the disk it is you're looking for, not
> > > which general section. :)
> >
> > I don't understand. As long as you return/pass a float with
> > a zero fraction, everything should be ok:
> >
> > (lseek 545485845.0 seek_cur)
> >
> > It only has to be *representable* as a 64-bit number. And that
> > can be checked in the call.
>
> All fractionless zero-exponent 64 bit floats can be represented as 64
> bit integers. The problem is that the reverse is not true -- all 64
> bit integers cannot be represented exactly as the the mantissa of some
> double precision float.
Of course you're right. My apologies for being so daft. ;-)
Hm, how much can then be represented in an IEEE double?
Would it be sufficient for, say, a range of 48 bit integers?
cheers,
felix
- Re: [Chicken-users] long pointer equivalent, (continued)
- Re: [Chicken-users] long pointer equivalent, felix, 2002/08/23
- Re: [Chicken-users] long pointer equivalent, Peter Keller, 2002/08/23
- Re: [Chicken-users] long pointer equivalent, felix, 2002/08/24
- Re: [Chicken-users] long pointer equivalent, Peter Keller, 2002/08/25
- Re: [Chicken-users] long pointer equivalent, felix, 2002/08/25
- Re: [Chicken-users] long pointer equivalent, Perry E. Metzger, 2002/08/25
- Re: [Chicken-users] long pointer equivalent, felix, 2002/08/26
- Re: [Chicken-users] long pointer equivalent, Perry E. Metzger, 2002/08/26
- Re: [Chicken-users] long pointer equivalent, felix, 2002/08/26
- Re: [Chicken-users] long pointer equivalent, Perry E. Metzger, 2002/08/26
- Re: [Chicken-users] long pointer equivalent,
felix <=
- Re: [Chicken-users] long pointer equivalent, Peter Keller, 2002/08/26
- Re: [Chicken-users] long pointer equivalent, Perry E. Metzger, 2002/08/26
- Re: [Chicken-users] long pointer equivalent, Peter Keller, 2002/08/26
- Re: [Chicken-users] long pointer equivalent, Perry E. Metzger, 2002/08/26
- Re: [Chicken-users] long pointer equivalent, Benedikt Rosenau, 2002/08/26
- Re: [Chicken-users] long pointer equivalent, tonyg, 2002/08/27
- Re: [Chicken-users] long pointer equivalent, felix, 2002/08/27
- Re: [Chicken-users] long pointer equivalent, Perry E. Metzger, 2002/08/27
- Re: [Chicken-users] long pointer equivalent, Peter Keller, 2002/08/27
- Re: [Chicken-users] long pointer equivalent, Perry E. Metzger, 2002/08/27