Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!iuvax!rutgers!apple!oliveb!pyramid!ctnews!mitisft!kemnitz
From: kemnitz@mitisft.Convergent.COM (Gregory Kemnitz)
Newsgroups: comp.lang.c
Subject: Re: Is this portable?
Summary: If the machine's C compiler accepts K&R, it should work
Message-ID: <683@mitisft.Convergent.COM>
Date: 10 May 89 02:24:20 GMT
References: <1914@plx.UUCP>
Organization: Convergent Technologies, San Jose, CA
Lines: 27

In article <1914@plx.UUCP>, evan@plx.UUCP (Evan Bigall) writes:
. This works on my machine, but I am curious as to whether it is "officially"
. correct and portable C.  I can think of some machines where it could be trouble
. 
. 	main()
. 	  { int array[10], *ptr, j;
. 
. 	    for(j=0; j<10; j++)
. 	      array[j]=j;
. 
. 	    ptr= &array[1];
. 
. 	    for(j= -1; j<9; j++)
. 		printf("%d\n", ptr[j]);
. 	  }
.

From page 94 of K&R:

If pa points to a particular element of an array a, then by definition pa+1
points to the next element, and in general pa-i points i elements before pa
and pa+i points i elements after.

(end of quote).


Greg Kemnitz