Solutions for the Kernighan and Ritchie

**freeasinfreedom** · Oct 2 '08, 05:45 PM

Re: Solutions for the Kernighan and Ritchie

On Oct 2, 6:10 pm, another...@gmai l.com wrote:

Hi everyone,
>
I've read the Kernighan and Ritchie some time ago, and then again, but
this time I've done the full set of exercises. I figured it would be
nice to share them :
>

free.fr

http://linkefong.free.fr/downloads/tcpl/tcpl-solutions-1.0.zip

>
Your comments are welcome.
>
I've of course didn't peek in Tondo and Gimpel's book or Richard
Heathfield.
>
Regards,

Nice!

Since you like sharing your knowledge, you might be interested in
contributing to the free software community by adding you project to
savannah (savannah.gnu.o rg). In this way you could educate many
people.

Happy Hacking!

**user923005** · Oct 2 '08, 07:35 PM

Re: Solutions for the Kernighan and Ritchie

On Oct 2, 9:10 am, another...@gmai l.com wrote:

Hi everyone,
>
I've read the Kernighan and Ritchie some time ago, and then again, but
this time I've done the full set of exercises. I figured it would be
nice to share them :
>

free.fr

http://linkefong.free.fr/downloads/tcpl/tcpl-solutions-1.0.zip

>
Your comments are welcome.
>
I've of course didn't peek in Tondo and Gimpel's book or Richard
Heathfield.

It might be nice to merge these solutions with Richard's collection
that is online.

**Richard Heathfield** · Oct 2 '08, 09:15 PM

Re: Solutions for the Kernighan and Ritchie

user923005 said:

On Oct 2, 9:10 am, another...@gmai l.com wrote:

>Hi everyone,
>>
>I've read the Kernighan and Ritchie some time ago, and then again, but
>this time I've done the full set of exercises. I figured it would be
>nice to share them :
>>
>http://linkefong.free.fr/downloads/t...utions-1.0.zip
>>
>Your comments are welcome.
>>
>I've of course didn't peek in Tondo and Gimpel's book or Richard
>Heathfield.

>
It might be nice to merge these solutions with Richard's collection
that is online.

It's true that I started the collection, but I have long since palmed it
off onto the clc wiki, which may be found at this URL:

Main Page - clc-wiki

http://clc-wiki.net/wiki/Main_Page

The K&R2 solutions page is: http://clc-wiki.net/wiki/K%26R2_solutions

--
Richard Heathfield <http://www.cpax.org.uk >
Email: -http://www. +rjh@
Google users: <http://www.cpax.org.uk/prg/writings/googly.php>
"Usenet is a strange place" - dmr 29 July 1999

**anotherlin@gmail.com** · Oct 2 '08, 10:15 PM

Re: Solutions for the Kernighan and Ritchie

I'll be glad to see them added to the clc-wiki. The admin has my
blessing to upload them.

I've basically answered all exercises, even those missing from
Richard's collection.

But first, is there somebody to check them for correctness? Any
comments?

**Flash Gordon** · Oct 3 '08, 12:05 AM

Re: Solutions for the Kernighan and Ritchie

anotherlin@gmai l.com wrote, On 02/10/08 23:09:

I'll be glad to see them added to the clc-wiki. The admin has my
blessing to upload them.

Thanks for getting his/her blessing first. Please include a link to the
original site when uploading them.

I've basically answered all exercises, even those missing from
Richard's collection.
>
But first, is there somebody to check them for correctness? Any
comments?

After uploading them they can be edited. So I would suggest upoading
them then posting links to them here asking for comment.
--
Flash Gordon
If spamming me sent it to smap@spam.cause way.com
If emailing me use my reply-to address
See the comp.lang.c Wiki hosted by me at http://clc-wiki.net/

**Ben Bacarisse** · Oct 3 '08, 12:55 AM

Re: Solutions for the Kernighan and Ritchie

anotherlin@gmai l.com writes:

Hi everyone,
>
I've read the Kernighan and Ritchie some time ago, and then again, but
this time I've done the full set of exercises. I figured it would be
nice to share them :
>

free.fr

http://linkefong.free.fr/downloads/tcpl/tcpl-solutions-1.0.zip

>
Your comments are welcome.

Looks good. That was a quick glance and if I have time I'll look
again. On one style issue, I was baffled by the large number of blank
lines. I won't make a fuss about style but it looked odd to me.

I spent a bit more time on one that I am currently familiar with (the
RPN calculator from chapter 4) and I am disappointed to see you also
have lost the original (correct in my opinion) K&R design of passing
getop the buffer size so you can prevent overflow. I'd count this as
a error.

--
Ben.

**user923005** · Oct 3 '08, 03:45 AM

Re: Solutions for the Kernighan and Ritchie

On Oct 2, 9:10 am, another...@gmai l.com wrote:

Hi everyone,
>
I've read the Kernighan and Ritchie some time ago, and then again, but
this time I've done the full set of exercises. I figured it would be
nice to share them :
>

free.fr

http://linkefong.free.fr/downloads/tcpl/tcpl-solutions-1.0.zip

>
Your comments are welcome.
>
I've of course didn't peek in Tondo and Gimpel's book or Richard
Heathfield.

The test driver for exercise 4.2 does not test the atof() function:

int main ()

{
printf("%g\n", 123.45e-6);
return 0;
}

Probably, you meant to do this:

#include <stdio.h>
int main ()

{
printf("%g\n", atof("123.45e-6"));
return 0;
}

**Richard Bos** · Oct 3 '08, 10:55 AM

Re: Solutions for the Kernighan and Ritchie

freeasinfreedom <faifgnu@gmail. comwrote:

On Oct 2, 6:10 pm, another...@gmai l.com wrote:

I've read the Kernighan and Ritchie some time ago, and then again, but
this time I've done the full set of exercises. I figured it would be
nice to share them :

http://linkefong.free.fr/downloads/t...utions-1.0.zip

[ Edited for honesty ]

Since you like sharing your knowledge, you might be interested in
contributing to the free software community by adding you project to
spammy (spamspam.spam. gnu.org).

Or rather, do not, since I cannot find an Earthly reason why anyone
would think answers to K&R exercises have anything to do with the
contents of that page.

Freedom? Freedom to advertise where it isn't wanted, apparently.

Richard

**anotherlin@gmail.com** · Oct 3 '08, 07:35 PM

Re: Solutions for the Kernighan and Ritchie

Looks good. That was a quick glance and if I have time I'll look

again. On one style issue, I was baffled by the large number of blank
lines. I won't make a fuss about style but it looked odd to me.

Well, I prefer things well separated. I use vi inside an 80x70
characters
xterm so there doesn't seem to be so much of them. I agree things can
look
differently and styles are a matter of personal taste.

I spent a bit more time on one that I am currently familiar with (the
RPN calculator from chapter 4) and I am disappointed to see you also
have lost the original (correct in my opinion) K&R design of passing
getop the buffer size so you can prevent overflow. I'd count this as
a error.

I started with the getop() function p78 of my 2nd edition book (41st
printing)
and there is no buffer size (prototype is int getop (char s[])). In
fact, none
of the exercises of this chapter specifically ask for checking buffer
overflow.
However, I agree that it would have been better a better answer.

**anotherlin@gmail.com** · Oct 3 '08, 07:35 PM

Re: Solutions for the Kernighan and Ritchie

The test driver for exercise 4.2 does not test the atof() function:
[...]

Yes, you're right. I made a mistake and actually the atof() is not
correctly
tested and it has a bug! :( The exponent is not handled correctly, it
can be
fixed easily however. Thank you for pointing out this thing.

**anotherlin@gmail.com** · Oct 3 '08, 07:35 PM

Re: Solutions for the Kernighan and Ritchie

I'll be glad to see them added to the clc-wiki. The admin has my

blessing to upload them.

Thanks for getting his/her blessing first. Please include a link to the
original site when uploading them.

Ok, English is not my main language (I live in France). By "blessing",
I
meant "I authorize the admin to put the content of the zip archive on
the
clc-wiki. I do so very *happily*." Hence the "blessing". I apologize
if I
may have offended you.

I read wikis a lot for various topics. But so far, I do not know how
to
write on them. And besides, it may be good first to check if the
proposed
answers are correct (exercise 4-2 has a bug as pointed out) before
putting
them on the wiki? Unless, the way is to put on the wiki and then
correct
them as needed?

**Ben Bacarisse** · Oct 3 '08, 07:55 PM

Re: Solutions for the Kernighan and Ritchie

anotherlin@gmai l.com writes:
<snip>

>I spent a bit more time on one that I am currently familiar with (the
>RPN calculator from chapter 4) and I am disappointed to see you also
>have lost the original (correct in my opinion) K&R design of passing
>getop the buffer size so you can prevent overflow. Â I'd count this as
>a error.

>
I started with the getop() function p78 of my 2nd edition book (41st
printing)
and there is no buffer size (prototype is int getop (char s[])). In
fact, none
of the exercises of this chapter specifically ask for checking buffer
overflow.
However, I agree that it would have been better a better answer.

Well that explains why so many people have the same "fault". In my
K&R (I don't have the 2nd edition) getop takes a char * and an int.
Hardly surprising, the code check to ensure that the buffer passed is
never overrun.

I can't imagine why they'd go backwards, but it solves the mystery of
so many solutions that look, to me, like backward steps!

--
Ben.

**Flash Gordon** · Oct 4 '08, 01:05 PM

Re: Solutions for the Kernighan and Ritchie

anotherlin@gmai l.com wrote, On 03/10/08 20:31:

>>I'll be glad to see them added to the clc-wiki. The admin has my
>>blessing to upload them.

>Thanks for getting his/her blessing first. Please include a link to the
>original site when uploading them.

>
Ok, English is not my main language (I live in France). By "blessing",
I
meant "I authorize the admin to put the content of the zip archive on
the
clc-wiki. I do so very *happily*." Hence the "blessing". I apologize
if I
may have offended you.

There was no offence taken. I miss-read what you said as saying that the
admin of the site where they currently reside had given his/her blessing.

Oh, and I only have admin access because I host it. I don't have any
special control in terms of what is posted to the Wiki.

I read wikis a lot for various topics. But so far, I do not know how
to
write on them. And besides, it may be good first to check if the
proposed
answers are correct (exercise 4-2 has a bug as pointed out) before
putting
them on the wiki? Unless, the way is to put on the wiki and then
correct
them as needed?

Wiki's are editable, so you can put them up and correct them. You do
have to create yourself an account first.
--
Flash Gordon
If spamming me sent it to smap@spam.cause way.com
If emailing me use my reply-to address
See the comp.lang.c Wiki hosted by me at http://clc-wiki.net/

Solutions for the Kernighan and Ritchie

Solutions for the Kernighan and Ritchie

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment