Path: utzoo!mnetor!uunet!lll-winken!lll-lcc!lll-tis!ames!rutgers!rochester!cornell!batcomputer!sun!mrd
From: mrd@sun.soe.clarkson.edu (Mike DeCorte)
Newsgroups: comp.lang.c
Subject: Re: interesting program
Message-ID: <297@sun.soe.clarkson.edu>
Date: 31 Jan 88 23:33:26 GMT
References: <19@berick.UUCP>
Organization: Clarkson University, Potsdam, NY
Lines: 41
In-reply-to: jeffl@berick.UUCP's message of 29 Jan 88 17:34:31 GMT

Posting-Front-End: GNU Emacs 18.47.5 of Mon Jan 25 1988 on sun.soe.clarkson.edu (berkeley-unix)


In article <19@berick.UUCP> jeffl@berick.UUCP (Jeff Lawhorn) writes:

   After watching all the flame wars here I decided that it was time to
   start one of my own  ;)

   What does the following program print?  (I know of at least one
   program that prints the wrong answer).

   main()
   {
	   int k = 4;
	   k = k++;
	   printf("and the answer is %d\n", k);
	   exit(0);
   }

There is no wrong answer to this! (assuming you answer either 4 or 5)
They are both right!

Reread page 50 of K&R.  If you have not read K&R DON'T tell people
what is and is not correct.

Here are the two possible interpetations.

1)
rk = 4  	(rk for rvlaue)
put rk into lk  (lk for lvalue)
increment lk    (value of lk = 5 now)

final answer = 5

2)
rk = 4  	(rk for rvlaue)
increment lk    (value of lk = 5 now)
put rk(4) into lk  (lk for lvalue)

final answer = 4

-- 
Michael DeCorte
mrd@clutx.clarkson.edu
mrd@clutx.bitnet