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From: richard@aiai.ed.ac.uk (Richard Tobin)
Newsgroups: comp.lang.c,comp.sources.wanted
Subject: Re: Fixed point numeric routines.
Message-ID: <2193@skye.ed.ac.uk>
Date: 10 Apr 90 20:16:12 GMT
References: <3804NU013809@NDSUVM1> <1990Apr7.223842.14425@utzoo.uucp>
Reply-To: richard@aiai.UUCP (Richard Tobin)
Organization: AIAI, University of Edinburgh, Scotland
Lines: 16

>>I assume that what I need are fixed point numeric routines which will
>>handle only a finite number of decimal places of precision.  

>If all amounts are guaranteed to be less than about $20 million, by far
>the simplest method is to use `long int' and measure money in pennies.

If you need larger amounts, you may find it possible to use floating
point *but still do everything in pennies*.  A double precision floating
point number should be able to store integers of around 50 bits without
loss of accuracy.

-- Richard
-- 
Richard Tobin,                       JANET: R.Tobin@uk.ac.ed             
AI Applications Institute,           ARPA:  R.Tobin%uk.ac.ed@nsfnet-relay.ac.uk
Edinburgh University.                UUCP:  ...!ukc!ed.ac.uk!R.Tobin