From: "Gwen" <mb11363 AT chello DOT be>
Subject: Re: question about getkey() , time() and how to pick a char from the screen
Newsgroups: comp.os.msdos.djgpp
References: <01c11959$9c6f2d00$108784d5 AT feta> <9k5va9$r56$1 AT nets3 DOT rz DOT RWTH-Aachen DOT DE>
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Date: Wed, 01 Aug 2001 00:48:08 GMT
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Hans-Bernhard Broeker <broeker AT physik DOT rwth-aachen DOT de> wrote in article
<9k5va9$r56$1 AT nets3 DOT rz DOT RWTH-Aachen DOT DE>...
> According to the scriptures, you should never do any arithmetics on
> time_t yourself. The language standard doesn't let you know what a
> time_t variable really contains. Instead, you should use the
> 'difftime()' function, which exists exactly for that purpose.

yes difftime() is what I needed, but it's in second too.
I tried some stuff with the number of ticks from the clock (function clock
() : 91 ticks=1 second), it gives good result.
Doing arithmetic with the clock_t type is certainly not very elegant, but
it works in my case ( there isn't a function like diffclock() ). 

btw, thanks for your help !

Gwen