Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!samsung!dali.cs.montana.edu!uakari.primate.wisc.edu!zaphod.mps.ohio-state.edu!wuarchive!udel!rochester!pt.cs.cmu.edu!o.gp.cs.cmu.edu!andrew.cmu.edu!sa1z+
From: sa1z+@andrew.cmu.edu (Sudheer Apte)
Newsgroups: comp.lang.c
Subject: for() and while() (was Re: Comparing strings...)
Message-ID: <8b7=x6O00WB487ZnYk@andrew.cmu.edu>
Date: 17 Oct 90 20:29:58 GMT
References: <2205.271700c2@cc.nu.oz.au> <1990Oct13.190106.15615@ux1.cso.uiuc.edu> <10678.271ade27@amherst.bitnet>,
	<1990Oct17.030157.460@ux1.cso.uiuc.edu>
Organization: Civil Engineering, Carnegie Mellon, Pittsburgh, PA
Lines: 40
In-Reply-To: <1990Oct17.030157.460@ux1.cso.uiuc.edu>

gordon@osiris.cso.uiuc.edu (John Gordon) writes:
>         Also, one other thing: for() and while() loops are essentially 
> identical.  The following loops are exactly the same:
> [ example "for" and "while" loops deleted ]

Yes, but there's one pitfall: the way "continue" is handled.  If you
put a "continue" in a while loop, your incrementing operation at the
end of the loop will never be executed after the "continue" is taken,
making your "while" loop run forever.

Example:

#include <stdio.h>

main()
{
  int i;
  printf("FOR loop: ");
  for (i=0; i<10; i++) {      /* Prints 1 2 3 4 6 7 8 9 */
    if(i==5)
      continue;
    printf(" %d", i);
  }
  printf("\nWHILE loop: ");
  i = 0;
  while (i<10) {
    if (i==5)
      continue;                     /* Bad idea */
    printf(" %d", i); fflush(stdout);
    i++;
  }
  printf("\n");
}


Thanks,
	Sudheer.
------------------------
...{harvard,uunet}!andrew.cmu.edu!sa1z
sa1z%andrew@CMCCVMA