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From: DBH106@psuvm.psu.edu
Newsgroups: comp.lang.pascal
Subject: Re: Is this a bug in TurboPascal
Message-ID: <91121.101409DBH106@psuvm.psu.edu>
Date: 1 May 91 14:14:09 GMT
References: <1991May1.021059.2129@ux1.cso.uiuc.edu>
Organization: Penn State University
Lines: 13

When you use integers, you must be aware that the highest value an integer can
have is 32767.  The program you posted multiplied 300 * 639 {xx} / 639.  First,
300 is multiplied by 639, resulting in 191700.  This is the error.  If you had
the Range Checking flag on you would have got a run time error.  With it off,
you get (I think) -4908.  Then the division results in -7.68... .  the Trunc
function gives -7 as the answer.  The other bad input is the same problem, I
believe.

One suggestion.  When first writing a program, set all the compiler option
flags.

Dan Harter
DBH106@psuvm.psu.edu