TC vs mainframe

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#6131

From: Yijun Ding
Date: Mon, 13 May 1991 03:32

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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?

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!unix.cis.pitt.edu!yding
From: yding@unix.cis.pitt.edu (Yijun Ding )
Newsgroups: comp.os.msdos.programmer
Subject: TC vs mainframe
Keywords: tc
Message-ID: <127293@unix.cis.pitt.edu>
Date: 13 May 91 03:32:21 GMT
Organization: Univ. of Pittsburgh, Computing & Information Services
Lines: 13