Path: utzoo!attcan!uunet!tut.cis.ohio-state.edu!ucsd!usc!zaphod.mps.ohio-state.edu!rpi!crdgw1!underdog!volpe
From: volpe@underdog.crd.ge.com (Christopher R Volpe)
Newsgroups: comp.lang.c
Subject: Re: Casting pointers
Keywords: cast
Message-ID: <9959@crdgw1.crd.ge.com>
Date: 19 Jul 90 13:45:49 GMT
References: <1614@ghost.stsci.edu>
Sender: news@crdgw1.crd.ge.com
Reply-To: volpe@underdog.crd.ge.com (Christopher R Volpe)
Lines: 26

In article <1614@ghost.stsci.edu>, davids@stsci.EDU (David Silberberg) writes:
|>If the last line above were replaced by
|>
|>	 ptr = (char *)ptr + num_chars;
|>
|>it would perform as desired.  Does casting work on an lvalue?

I'm not sure if casting on an l-value is specified anywhere. (Never seen it
in K&R.) But it sometimes does bizarre things. Consider the following
code:                     
main()
{ int i;
  float f;

  f=2.0;
  (float) i = f;
  printf("i==%d\n",i);
}

Compiled with Sun C, this program prints:
i==1073741824

Compiled with gcc, it prints
i==2

Chris Volpe