NetNews Offline 2/NetNews Offline Volume 2.iso/news/comp/lang/c-part2/13664

Internet Message Format | 1996-08-05 | 1.7 KB

Path: nyssa.swt.edu!LN16674
From: [e-mail] (Leland Newsom)
Newsgroups: comp.lang.c
Subject: Re: reversing a string
Date: 9 Apr 1996 17:38:14 GMT
Organization: Southwest Texas State University
Message-ID: <4ke7a6$[e-mail]>
References: <4k6cjl$[e-mail]> <4kb1s7$[e-mail]>,<[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: nyssa.swt.edu

In article <[e-mail]>, Lawrence Kirby <[e-mail]> writes:
>In article <4kb1s7$[e-mail]>
>           [e-mail] "John Murphy" writes:
>
>>In article <4k6cjl$[e-mail]>, [e-mail]
>>says...
>>>
>>>I have a challenge from a friend of mine.  He wanted me to reverse a string
>>>with recursion without using any additional variables or loops.  I got mine
>>>to work by using exclusive or, but I needed an additional variable.  Can
>>>someone help with this problem without using the additional variable?
>>>
>>>Thanks
>>You can swap two variables, x and y, with the following series of exclusive
>>or's:
>>        x ^= y;
>>        y ^= x;
>>        x ^= y;
>
>From what he wrote I believe Leland was already doing that. The problem is
>to write the entire function without using an additional variable. It
>can be done! :-)
>
>--
>-----------------------------------------
>Lawrence Kirby | [e-mail]
>Wilts, England | [e-mail]
>-----------------------------------------



Yes, I was doing that.  He said that it could be done without any extra
variables.  He also said that if you get real cryptic you can do the function
in one or two lines.

Thanks
Leland