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From: phipps@fortune.UUCP (Clay Phipps)
Newsgroups: net.lang.c
Subject: Pascal Modulus Operator / Re: Modulus Fn With Negatives
Message-ID: <4179@fortune.UUCP>
Date: Mon, 10-Sep-84 18:41:08 EDT
Article-I.D.: fortune.4179
Posted: Mon Sep 10 18:41:08 1984
Date-Received: Sun, 16-Sep-84 10:33:59 EDT
References: <212@digi-g.UUCP>
Organization: Fortune Systems, Redwood City, CA
Lines: 17

Pascal doesn't define its modulus operator for negative 'divisors'.

To quote from ANSI/IEEE 770X3.97-1983 (the Pascal Standard), p. 73:

    A term of the form i mod j shall be an error 
    if j is zero or negative,
    otherwise the value of i mod j shall be that value of (i-(k*j))
    for integral k such that 0 <= i mod j < j.
    NOTE: Only for i >= 0 and j > 0 does the relation
    (i div j) * j + i mod j = i hold.

-- Clay Phipps

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