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Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!uflorida!ukma!tut.cis.ohio-state.edu!osu-cis!att!ihlpe!kah120
From: kah120@ihlpe.ATT.COM (452is-Heitke)
Newsgroups: comp.sys.mac.programmer,comp.sys.mac
Subject: Re: LSC3.0 brain damage
Keywords: stdio, pointers
Message-ID: <4642@ihlpe.ATT.COM>
Date: 3 Apr 89 15:47:20 GMT
References: <1704@ncar.ucar.edu>
Distribution: usa
Organization: AT&T Bell Laboratories - Naperville, Illinois
Lines: 32

In article <1704@ncar.ucar.edu>, bill@hao.ucar.edu (Bill Roberts) writes:
> Below is a simple code segment that I was trying to use on a Mac+ using
> LSC 3.0.  The problem is that the printed value of ptr never increments.  It
> always stays the same!  I move this code over to a Sun4 and it works as one 
> would expect!  What gives?  Anyone else run into this problem?
> 
> #include <stdio.h>
> #include <unix.h>
> #include <storage.h>
> main()
> {
> 	char 	*ptr;
> 	int	max= 400;
> 	
> 	if ((ptr= (char *)malloc(500)) == NULL){
> 		fprintf (stderr,"ERROR: malloc() \n");
> 		exit();
> 	}
> 	while (max--)
> 		fprintf (stderr,"ptr= %d\n", ptr++);
> 		
> }

The ptr is actually a 32 bit variable and the %d in the printf format will only
print the value of a 16 bit quantity.  In this case it happens to be the 
upper 16 bits of the address which doesn't change.  To print the actual pointer
value use %ld or %lx (for hex).
> 
> --Bill


					Ken Heitke