Article View: comp.os.msdos.programmer
Article #6136Re: TC vs mainframe
From: a_rubin
Date: Mon, 13 May 1991 16:11
Date: Mon, 13 May 1991 16:11
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1101 bytes
In <127293@unix.cis.pitt.edu> yding@unix.cis.pitt.edu (Yijun Ding ) writes:
>Recently I have a program with small floatings. I find something works
>on my TC but not on mainframe. The following code, log10() print
>correctly on TC2.0. It is HUGE on unix, and 0 on VMS in University of
>Pittsburgh. That is a surprise.
>#include <math.h>
>main()
>{
> double a=1.12345e-40;
> printf("%lf %lf\n", a, log10(a));
>}
>Any one can explain why?
I don't know about UNIX, but in VMS, 1.12345e-40 is calculated as a float,
rather than a double; hence it is 0. (log10(0) is 0? THAT is a bug.)
--
a_rubin@dsg4.dse.beckman.com
My opinions are my own, and do not represent those of my employer.
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!orion.oac.uci.edu!biivax.dp.beckman.com!dn71!a_rubin From: a_rubin@dsg4.dse.beckman.com Newsgroups: comp.os.msdos.programmer Subject: Re: TC vs mainframe Keywords: tc Message-ID: <a_rubin.674151080@dn71> Date: 13 May 91 16:11:20 GMT References: <127293@unix.cis.pitt.edu> Lines: 21 Nntp-Posting-Host: dn71.dse.beckman.com