1. Re[4]: OOT: Interesting C quiz
- Posted by akusaya at gmx.net
Feb 17, 2004
OK,
1. change i-- to n--
2. change i<n to -i<n
3. change i<n to i+n (tricky!)
4. change i<n to ~i<n
The question says there are at least 4 ways,, who knows there are
more...??
P> Show them please, I'm curious.
P> Phil
P> akusaya at gmx.net wrote:
>>
>>
>> Yes i think...
>>
>> btw after several thinking and asking friends I managed to get all
>> solutions! Thanks!
>>
>> C> I think listfilter mangled the code...
>>
>>
>> C> It should be:
>>
>> C> /*
>> C> Find at least 4 different ways to change only one
>> C> character in the C code below so it will print the
>> C> minus sign "-" 20 or 21 times only.
>> C> */
>>
>> C> #include <stdio.h>
>>
>> C> main()
>> C> {
>> C> int i, n= 20; /*= 20 was changed to a space!*/
>> C> for(i=0; i<n; i--) printf("-");
>> C> return 0;
>> C> }
>>
>> C> akusaya at gmx.net wrote:
>> >>
>> >>
>> >> Got it from http://www.genesim.co.il/cprog.htm
>> >>
>> >> For C programmers, here is a C code quiz. You are invited to give it a
>> >> try.
>> >>
>> >> /*
>> >> Find at least 4 different ways to change only one
>> >> character in the C code below so it will print the
>> >> minus sign "-" 20 or 21 times only.
>> >> */
>> >>
>> >> #include <stdio.h>
>> >>
>> >> main()
>> >> {
>> >> int i, n ;
>> >> for(i=0; i<n; i--) printf("-");
>> >> return 0;
>> >> }
>> >>
>> >> ===========================
>> >> I can only know 2 of them,
>> >> 1. change i-- to n--
>> >> 2. change i<n to -i<n
>> >>
>> >> Can anyone help me finding the other two? I am very curious...
>> >>
>> >> Thx!
>> >>
>> >>
P> TOPICA - Start your own email discussion group. FREE!
2. Re: Re[4]: OOT: Interesting C quiz
On Tue, 17 Feb 2004 21:53:42 +0800, aku saya <akusaya at gmx.net> wrote:
>1. change i-- to n--
>2. change i<n to -i<n
>3. change i<n to i+n (tricky!)
>4. change i<n to ~i<n
>
>The question says there are at least 4 ways,, who knows there are
>more...??
Does i^n work?
3. Re: Re[4]: OOT: Interesting C quiz
On Wed, 18 Feb 2004 10:38:04 +0000, Pete Lomax
<petelomax at blueyonder.co.uk> wrote:
>
>
>On Tue, 17 Feb 2004 21:53:42 +0800, aku saya <akusaya at gmx.net> wrote:
>
>>1. change i-- to n--
>>2. change i<n to -i<n
>>3. change i<n to i+n (tricky!)
>>4. change i<n to ~i<n
>>
>>The question says there are at least 4 ways,, who knows there are
>>more...??
>Does i^n work?
Sorry, I just realised that's another infinite loop, never mind.
Pete
