Path: utzoo!utgpu!attcan!uunet!husc6!cmcl2!rutgers!apple!voder!pyramid!decwrl!megatest!djones
From: djones@megatest.UUCP (Dave Jones)
Newsgroups: comp.lang.c
Subject: Re: Passing types to a subroutine
Message-ID: <996@goofy.megatest.UUCP>
Date: 10 Nov 88 05:25:00 GMT
References: <14457@mimsy.UUCP>
Organization: Megatest Corporation, San Jose, Ca
Lines: 20

From article <14457@mimsy.UUCP>, by sjr@mimsy.UUCP (Stephen J. Roznowski):
> I'm in the process of developing a piece of code that needs
> to be portable across several different machines.  ...

[ How to switch between using floats and doubles? ]

If I understand the question, you can do it as follows.  Declare
a typedef for the type "real".  Use "real" everywhere instead of
"float" or "double".

#ifdef FLOATS
typedef float real;
#else 
typedef double real;
#endif

You should be sure you are familiar with the way floats are
cast to doubles on procedure calls, etc..  (See K&R)  If your machine
uses IEEE floating point format, the cast operation takes a nontrivial
amount of time.