Re: Data Type question / Sort

From: Tom Ogilvy (twogilvy_at_msn.com)
Date: 08/12/04 

Date: Thu, 12 Aug 2004 16:00:19 -0400

A long can store numbers in this range: 2,147,483,648 to 2,147,483,647

A double can store numbers in this range: -1.79769313486231E308
to -4.94065645841247E-324 for negative values and from 4.94065645841247E-324
to 1.79769313486232E308 for positive values. But only approximately 15
significant digits. 

-- 
Regards,
Tom Ogilvy
"Marston" <marston_gould@mac.com> wrote in message
news:4a0545c6.0408111645.2689633@posting.google.com...
> Hi
>
> I'm trying to prep some values for a multi-column sort in an array.
> The array contains something like 300,000 by 10 values
> I've seen quick sort routines that can sort on a single value, but not
> perform sorts within the initial sort.
>
> My idea was to concatenate all my values into a single value and then
> sort on it. The problem I'm facing is that my numbers would have to be
> on the order of ~10E+18-1 long
>
> The way the routine works is it looks at the numbers in each column
> whose length is fixed and never has a situation where there are
> leading zeros to cause problems.
>
>        Col 1   Col 2  Col 3 Col 4   Col 5 Col 6
> Row x: aaa     bbb    cc    ddddd   e     fff
>
> I only need to arrange based on these 6 columns not the entire 10 in
> the array
>
> My problem is when I create a number like aaabbbccdddddefff it appears
> to have
> problems with the "efff" portion. I checked each individual component
> (which I'm multiplying by some 1nnnn where n is some number of zeros -
> and they all work fine, its just once I tried to add things. Its like
> it drops values off.
> I have the variables defined as Double which I thought would work.
>
> Any thoughts?

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