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From: tim@ISM780B.UUCP
Newsgroups: net.lang.c
Subject: Re: ANSI 'C'.
Message-ID: <25500123@ISM780B.UUCP>
Date: Mon, 25-Nov-85 17:55:00 EST
Article-I.D.: ISM780B.25500123
Posted: Mon Nov 25 17:55:00 1985
Date-Received: Thu, 28-Nov-85 04:31:44 EST
References: <447@graffiti.UUCP>
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Nf-ID: #R:graffiti:-44700:ISM780B:25500123:000:602
Nf-From: ISM780B!tim    Nov 25 17:55:00 1985


> times.  They define type "time_t" as an arithmetic type that
> represents the time, and then define a difftime(time_t
> time1,time_t time2) that computes the difference between these
> two arithmetic values.  Why the function?  Does the standard have
> a new arithmetic type on which the operation of subtraction is
> not allowed?

The difftime function first transforms both times to the frame of an observer
at Greenwich (sp?).  It needs to be a function, because the standard
C subtraction operator knows nothing about general relativity.

					Tim Smith
					ihnp4!cithep!tim
					ima!ism780!tim