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Re: Floats [message #47851 is a reply to message #4362]

Wed, 08 March 2006 16:33

Paul Van Delst[1]
Messages: 1157
Registered: April 2002

Senior Member

Mark Hadfield wrote:
> Paul Van Delst wrote:
>
>> Sheldon wrote:
>>
>>>
>>> Here is a silly question: Can I define a float array and control how
>>> many decimal places are kept? For example, I want all values to only
>>> have an accuracy to the nearest 100th (20.15 and not 20.154983445).
>>> Kind of like in printing, you know, the f5.2 print definition, but only
>>> for variables and arrrays.
>>
>>
>> May I ask why? Usually this sort of thing is required for printing,
>> but not for regular old storage of numbers.
>
>
> Currency?

Ah, fair enough. But a hasty google reveals that currency calculations are not done at the
cent level - a higher precision is required; for currency conversions (6sigfigs), or in
calculating how much you have to pay when you buy petrol or gas etc, (1000th's seem to be
the common unit.).

Another example I looked at converted 1000 Finnish Markka's to Euros 6 times (conversion
rate to 6sigfig) and added the result (ï¿½1024.92). Converting 6000 Finnish Markka's was
ï¿½1024.90 A 2 cent difference. That may add up when you're converting lotsa moola lotsa times.

So, it seems to me the only reason you'd need precision to 100th's for currency is for
printing your invoices. :o)

cheers,

paulv

p.s. I can't believe I just read 20 pages from a report from the "EUROPEAN COMMISSION
DIRECTORATE GENERAL II ECONOMIC AND FINANCIAL AFFAIRS Monetary matters". Jeez. :o)
--
Paul van Delst
CIMSS @ NOAA/NCEP/EMC

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[Message index]

		floats from strings... duh! By: pjclinch on Fri, 26 May 1995 00:00
		Re: floats from strings... duh! By: velt on Wed, 31 May 1995 00:00
		Re: floats from strings... duh! By: rarback on Tue, 30 May 1995 00:00
		Re: floats from strings... duh! By: sterner on Tue, 30 May 1995 00:00
		Re: Floats By: David Fanning on Wed, 08 March 2006 18:42
		Re: Floats By: Kenneth P. Bowman on Thu, 09 March 2006 05:11
		Re: Floats By: Kenneth P. Bowman on Wed, 08 March 2006 18:24
		Re: Floats By: Paul Van Delst[1] on Wed, 08 March 2006 16:33
		Re: Floats By: Andrew Cool on Thu, 09 March 2006 15:16
		Re: Floats By: David Fanning on Wed, 08 March 2006 16:19
		Re: Floats By: Mark Hadfield on Wed, 08 March 2006 15:59
		Re: Floats By: James Kuyper on Thu, 09 March 2006 03:10
		Re: Floats By: Paul Van Delst[1] on Wed, 08 March 2006 13:54
		Re: Floats By: Liberum on Wed, 08 March 2006 13:42
		Re: Floats By: Liberum on Wed, 08 March 2006 13:42
		Re: Floats By: Mark Hadfield on Wed, 08 March 2006 13:06
		Re: Floats By: David Fanning on Wed, 08 March 2006 13:00

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