Xref: utzoo comp.lang.c:27647 comp.sources.wanted:11315
Newsgroups: comp.lang.c,comp.sources.wanted
Path: utzoo!henry
From: henry@utzoo.uucp (Henry Spencer)
Subject: Re: Fixed point numeric routines.
Message-ID: <1990Apr7.223842.14425@utzoo.uucp>
Organization: U of Toronto Zoology
References: <3804NU013809@NDSUVM1>
Date: Sat, 7 Apr 90 22:38:42 GMT

In article <3804NU013809@NDSUVM1> NU013809@NDSUVM1.BITNET (Greg Wettstein) writes:
>I assume that what I need are fixed point numeric routines which will
>handle only a finite number of decimal places of precision.  I am hoping
>that someone has some pointers to references describing such routines or
>perhaps a few snippets of C code...

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.
Just because the input and output have to say `$123.45' doesn't mean you
can't store that internally as the integer `12345'.  And the best part is
that `long int' arithmetic is already provided by your compiler.
-- 
Apollo @ 8yrs: one small step.|     Henry Spencer at U of Toronto Zoology
Space station @ 8yrs:        .| uunet!attcan!utzoo!henry henry@zoo.toronto.edu