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From: ron@ron.rutgers.edu (Ron Natalie)
Newsgroups: comp.sys.ibm.pc,comp.sys.intel
Subject: Re: correct code for pointer subtraction
Keywords: C pointer math DAMN WELL IS A BUG!!!!
Message-ID: <Jan.3.12.44.56.1989.4839@ron.rutgers.edu>
Date: 3 Jan 89 17:44:57 GMT
References: <597@mks.UUCP> <3845@pt.cs.cmu.edu> <18123@santra.UUCP> <142@bms-at.UUCP> <6604@killer.DALLAS.TX.US> <Jan.3.11.49.44.1989.22204@paul.rutgers.edu>
Organization: Rutgers Univ., New Brunswick, N.J.
Lines: 7

> sizeof(int) == 2
> so 30000 * 2 =60000 which is to large for a signed int

Sizeof is irrelevent for pointer math.  For subtraction, The result is the
number of "elements" which would be 30000, not 30000 times sizeof
int.  For addition, the result is a new pointer, incremented by the
number of elements of the integer added to the pointer.