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Interview test......

I want to set some simple coding tests for an interview....Joel
recommends (for C programmers)....

1. Reverse a string in place
2. Reverse a linked list
3. Count all the bits that are on in a byte
4. Binary search
5. Find the longest run in a string
6. atoi
7. itoa

I'm tempted to use 1....but it seems a little contrived....and 5 seems
reasonable.....
(unless people know of ways of shortcutting the test.....)

any other suggestions....

I obviously want to test ability rather than knowledge...so I don't
want things that is easy if you happen to know some obscure (or not)
method.....

Sep 21 '07 #1
22 4244
Simple... Which test is closest to the task you are hiring the person to
perform within your team?

"Ni***********@mtvne.com" wrote:
I want to set some simple coding tests for an interview....Joel
recommends (for C programmers)....

1. Reverse a string in place
2. Reverse a linked list
3. Count all the bits that are on in a byte
4. Binary search
5. Find the longest run in a string
6. atoi
7. itoa

I'm tempted to use 1....but it seems a little contrived....and 5 seems
reasonable.....
(unless people know of ways of shortcutting the test.....)

any other suggestions....

I obviously want to test ability rather than knowledge...so I don't
want things that is easy if you happen to know some obscure (or not)
method.....

Sep 21 '07 #2
What exactly are you looking to get from the test? I ask because I'm not a
fan of this type of interview scenario.

Ability does not come from being able to write a snippet of code in an
interview - its usually faster to download a snippet off the web these days
as an example and code from that - and most good coders have a library of
common functions they refer to (like string reverse etc.).

Its not really a good assesment of whether someone can disseminate a
problem, work out a strategy to solving it, plan an approach to solving the
problem, design and implementing that strategy to completion. I actually
prefer to pass a flawed piece of code to a candidate and ask them to try and
identify the problem with it, based in given inputs and outputs - which is
more like the real world problem a coder will face daily. You can then
assess how they dealt with the problem and how they sought solution which
shows experience and ability much better.

Regards

John Timney (MVP)
http://www.johntimney.com
http://www.johntimney.com/blog
<Ni***********@mtvne.comwrote in message
news:11*********************@22g2000hsm.googlegrou ps.com...
>I want to set some simple coding tests for an interview....Joel
recommends (for C programmers)....

1. Reverse a string in place
2. Reverse a linked list
3. Count all the bits that are on in a byte
4. Binary search
5. Find the longest run in a string
6. atoi
7. itoa

I'm tempted to use 1....but it seems a little contrived....and 5 seems
reasonable.....
(unless people know of ways of shortcutting the test.....)

any other suggestions....

I obviously want to test ability rather than knowledge...so I don't
want things that is easy if you happen to know some obscure (or not)
method.....

Sep 21 '07 #3
What kind of developer are you looking for?
A C# web-developer can work magic, without knowing how to complete any of
the tasks below.

Hehe, I think I can do Joels test in like a minute:
1. Use google
2. Use google
3. Why?
4. Use google
5. What?
6. old c stuff
7. old c stuff

Am I hired?

Jokes aside, having a dev actually submit the code says nothing.
And as far as I remember, Joel says that the answer is not important,
but how the dev thinks.

Instead of having the applicant give you the code for a binary search,
ask him/her what a binary search is, and if the applicant can explain
it to you, and tells you about Ordos(log2N),
the cost of having the list sorted and so on,
the applicant is probably a good hire.

My old trick is to show some of the code we are working on.
Except that the code is mined with stupid code in some places.
And while I talk about the code I look at the applicants reaction.
But you have to be carful making judgement, as the applicant may
be nervous and might not give critique as of politeness.

The key is to get the applicant talking about the code,
and while you promote bad code as being super smart,
if the applicant looks at you like you are a mad-man,
you have a good hire.

Also, it may be good idea telling the applicant you mined your code.
If the applicants leave still thinking you are a mad man, they probably
won't want to work for you anyway. =)

My 2 cents
- Michael Starberg

<Ni***********@mtvne.comwrote in message
news:11*********************@22g2000hsm.googlegrou ps.com...
>I want to set some simple coding tests for an interview....Joel
recommends (for C programmers)....

1. Reverse a string in place
2. Reverse a linked list
3. Count all the bits that are on in a byte
4. Binary search
5. Find the longest run in a string
6. atoi
7. itoa

I'm tempted to use 1....but it seems a little contrived....and 5 seems
reasonable.....
(unless people know of ways of shortcutting the test.....)

any other suggestions....

I obviously want to test ability rather than knowledge...so I don't
want things that is easy if you happen to know some obscure (or not)
method.....

Sep 21 '07 #4
<Ni***********@mtvne.comwrote in message
news:11*********************@22g2000hsm.googlegrou ps.com...
>I want to set some simple coding tests for an interview....Joel
recommends (for C programmers)....

1. Reverse a string in place
public class Demo
{
public void Start()
{
Console.WriteLine(Reverse("I know how to reverse in .NET 3.5
*s*"));
}

string Reverse(string s)
{
var q =
(from c in s
select c).Reverse();

var sb = new StringBuilder();
q.ToList().ForEach(c =sb.Append(c));

return sb.ToString();
}
}

Oops, forgot about the 'in place' part of the task.
Guess I have to go unsafe or to solve task number 1
as strings are immutable in .NET. =)

- Michael Starberg
Sep 21 '07 #5
Hi,

<Ni***********@mtvne.comwrote in message
news:11*********************@22g2000hsm.googlegrou ps.com...
>I want to set some simple coding tests for an interview....Joel
recommends (for C programmers)....

1. Reverse a string in place
This is good in C, not work in C#, string in C# are inmutables. But you can
ask that and if the answer is other than a stare look like "what r u
talking about" he does not know it.

Recently I got in a similar situation I was asked to implement a tree
structure. The code itself was useless, but it gave to a good conversation
of why/how to implement the stuff. How to test it, etc. so in resume the
test itself was not important, the answers derived from it were the
determinant criteria.
Sep 21 '07 #6
On Fri, 21 Sep 2007 14:54:47 +0200, "Michael S" <no@no.nowrote:
....
>My old trick is to show some of the code we are working on.
Except that the code is mined with stupid code in some places.
And while I talk about the code I look at the applicants reaction.
But you have to be carful making judgement, as the applicant may
be nervous and might not give critique as of politeness.
....
>- Michael Starberg
Isn't that a little dangerous? If someone showed me the code that
they said was what they were working on and it was lined with stupid
stuff, my first reaction would be to appologize for waisting their
time and leave. :-)

Sam
------------------------------------------------------------
We're hiring! B-Line Medical is seeking .NET
Developers for exciting positions in medical product
development in MD/DC. Work with a variety of technologies
in a relaxed team environment. See ads on Dice.com.

Sep 21 '07 #7
"Samuel R. Neff" <sa********@nomail.comwrote in message
news:ij********************************@4ax.com...
On Fri, 21 Sep 2007 14:54:47 +0200, "Michael S" <no@no.nowrote:
...
>>My old trick is to show some of the code we are working on.
Except that the code is mined with stupid code in some places.
And while I talk about the code I look at the applicants reaction.
But you have to be carful making judgement, as the applicant may
be nervous and might not give critique as of politeness.
...
>>- Michael Starberg

Isn't that a little dangerous? If someone showed me the code that
they said was what they were working on and it was lined with stupid
stuff, my first reaction would be to appologize for waisting their
time and leave. :-)

Sam
Well, they key is to notice that and explain that the code was mined.
Also, to get the applicant talking. Show that you want critique and talk
about code.
What applicant would start of by saying that the interviewers code sucks?
You need to invite them into a conversation about code.
You need to be nice.

From what I can tell, and from the dudes and gals that got hired as coders,
sitting in front of a computer and talk about code,
was an important factor for them when they took the job.

They liked that, they felt comfortable with that,
instead of being crammed in a conference room
and reply to silly questions.

But it is a little dangerous, and it is important to stay low,
as you are not just hiring, you are selling something,
a workplace.

So let the applicant talk, and not be a bigot, like:
- This is my cool code, I am supercool and you just an applicant newbie.

That would make anyone appologize for waisting their time and leave.
I'd wouln't even apologize. I'd laugh.

But Sam, wouln't you be comfortable sitting around talking about C#,
perhaps comparing it to C++, Java and Delphi, and see actual code,
and by so get proof that your co-workers code won't wind up on
worsethanfailure/dailyWTF =)

- Michael Starberg
Sep 22 '07 #8
"Michael S" <no@no.nowrote in message
news:ec**************@TK2MSFTNGP06.phx.gbl...
<Ni***********@mtvne.comwrote in message
news:11*********************@22g2000hsm.googlegrou ps.com...
Jon Skeet;
I expect you to use this code and write an article on premature
optimization.
Maybe you can publish it on your excellent website, April 1. =)

- Michael Starberg
Sep 22 '07 #9
Michael Starberg <no@no.comwrote:
"Michael S" <no@no.nowrote in message
news:ec**************@TK2MSFTNGP06.phx.gbl...
<Ni***********@mtvne.comwrote in message
news:11*********************@22g2000hsm.googlegrou ps.com...

Jon Skeet;
I expect you to use this code and write an article on premature
optimization.
Maybe you can publish it on your excellent website, April 1. =)
LOL. No, interview code is often pointless for anything other than
finding out about the candidate.

I had a Java test I gave which had about 35 problems in about 60 lines
of code. Some of the problems were obvious, some weren't. I converted
it to C#, but lost my favourite problem (String.Split in Java uses a
regular expression, and the idea was to split on a dot - so it had to
be escaped).

There are lots of different kinds of coding tests, of course...

--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too
Sep 22 '07 #10
"Jon Skeet [C# MVP]" <sk***@pobox.comwrote in message
news:MP*********************@msnews.microsoft.com. ..

Hehe.

If you ever applied for a new job,
all you have to do is submit your webpage,
- Any questions?

You are a inpiration for all of us

But back to our first guru, Joel on software,
his c programming tasks are pure c oriented.
Perhaps good if you are hiring a nerd that is supposed
to code embedded systems in microcode,
or an os-kernel.

But what would be good C# questions?
Being inspired by you and this usenet channel,
I think I would want to know and ask a see-sharper:

1. What are events and tell me about delegates.
2. What does internal protected mean, and have you ever used it?
3. What is the difference between overriding and reintroducing?
4. What is the PME-model?
5. How many pages would you need to write a paper on threading in .NET? *s*
6. What is Linq?
7. What is generations in the garbage collector, and how does it work?
8. What is IDisposable and why do .NET rename the OO-term 'destructor' into
'finalalizer'?
9. Tell me about generics and co/contra-variance.
10. What is Ordos?
11. What are normal forms in a relational database?
12. How should you comment your code?

This summer, I got 'upgraded' from MCAD to MCPD.
I took me three tries until I passed the exam,
and got my new nifty certificate.
While non-MCAD can take 2 tests and become MCTS,
I had to take three tests at the same time.
88 random questions from a 700 question bank of stupidity.

Not one question asked anything about the 12 bullets above.
Stupid test. I remember one question boiled down to
if I should call Assembly.Load() or Assembly.LoadFrom().
The correct answer was Assembly.LoadFrom()
as there are no static Assembly.Load() metod
on the Assembly class. Tjeesus.

Hello??? Am I supposed to know these things by heart?
I think not. I installed the gigabytes of MSDN for a reason,
and I know how to press F1, or use intellisense,
when I want to load an assembly in runtime.

Another question I remember was about instrumentation,
and I got to learn that I should not instrument on a daily basis,
nor stop using it, but the correct answer was to instrument
according to the maintanance plan. WTF?

It took me three tries to pass the exam, and every time
I tried, it felt surreal. What is it Cypher says in the movie The Matrix?

- Buckle up Dorothy, 'cause Kansas is going bye-bye.

This is why I downplay my MCPD certificate.
as it only shows that I can remember facts good enough
to pass a microsoft exam.

It says nothing, about my coding-skillz nor anything of
my skillz in system development and design. Or anything
about me not knowing how to spell skills correctly.

If an applicant came to me and started bragging about his
MCPD status, I'd end the interview with a laugh.

- Michael Starberg
Sep 22 '07 #11
Michael Starberg <no@no.comwrote:
If you ever applied for a new job,
all you have to do is submit your webpage,
- Any questions?
You might be surprised, actually...
You are a inpiration for all of us

But back to our first guru, Joel on software,
his c programming tasks are pure c oriented.
Perhaps good if you are hiring a nerd that is supposed
to code embedded systems in microcode,
or an os-kernel.
Well, there's more to it than that - there's seeing how someone thinks
and solve problems. That doesn't show you their object orientation
skills, but it shows a few interesting things.
But what would be good C# questions?
Being inspired by you and this usenet channel,
I think I would want to know and ask a see-sharper:

1. What are events and tell me about delegates.
2. What does internal protected mean, and have you ever used it?
3. What is the difference between overriding and reintroducing?
4. What is the PME-model?
5. How many pages would you need to write a paper on threading in .NET? *s*
6. What is Linq?
7. What is generations in the garbage collector, and how does it work?
8. What is IDisposable and why do .NET rename the OO-term 'destructor' into
'finalalizer'?
9. Tell me about generics and co/contra-variance.
10. What is Ordos?
11. What are normal forms in a relational database?
12. How should you comment your code?
Ha - you have high standards. If someone can tell me the different
between a value type and a reference type, what the "using" statement
is for, and when they'd use StringBuilder, they're better than most
candidates. Sad, isn't it?

To be honest, what I look for in a candidate is a spark (once I've
satisfied myself that they're at all competent). The questions that are
appropriate to find that spark are open-ended, and depend on the
experience of the candidate, but things like:

o What do you like most about C# 2 over C# 1?
o What would you change in C# if you could?
o What benefits does C# have over Java and vice versa?

<snip>
If an applicant came to me and started bragging about his
MCPD status, I'd end the interview with a laugh.
Agreed. People could claim I'm biased though, never having taken any
certification myself :)

--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too
Sep 22 '07 #12
"Jon Skeet [C# MVP]" <sk***@pobox.comwrote in message
news:MP*********************@msnews.microsoft.com. ..
>
There are lots of different kinds of coding tests, of course...
I would never take a coding test.
If they want to hire me, then I ask for a offer.

If they ask for a code-example a la Joel,
we start out with a breach of trust, and per so,
I don't want the job.

This thread is stuck on hiring.
Real programmers don't get hired,
they pick where to work.

And so I flip the entire thread from heads to tail,
and using a Kennedy metaphore,

"Instead of asking what a coder can do for you,
ask what your company can do for the coder"

A happy coder is a bug-free coder. =)

- Michael Starberg

Sep 22 '07 #13
"Doug Semler" <do********@gmail.comwrote in message
news:eZ**************@TK2MSFTNGP04.phx.gbl...

Excellent post!
I'll ponder on this and give my 1 cent after some sleep

- Michael Starberg
Sep 23 '07 #14
(I'll reply to the longer post when I've got more time.)

Michael Starberg <no@no.comwrote:
There are lots of different kinds of coding tests, of course...

I would never take a coding test.
If they want to hire me, then I ask for a offer.
I don't think I'd ever go that far. I applied for my current job like
anyone else would. I've had a few jobs specifically offered to me, but
really not very many at all.
If they ask for a code-example a la Joel,
we start out with a breach of trust, and per so,
I don't want the job.
I think it's reasonable not to trust CVs too far. I've seen a *lot* of
rubbish talked about on CVs. I'd never assume that someone can code
well just because they claim they can. Of course, if they've got sample
code on the net etc, that helps - but it's better to see someone in
action.
This thread is stuck on hiring.
Real programmers don't get hired,
they pick where to work.
Well, they still have to go for an interview - at least round here.
There was certainly no guarantee I'd get my current job.
And so I flip the entire thread from heads to tail,
and using a Kennedy metaphore,

"Instead of asking what a coder can do for you,
ask what your company can do for the coder"

A happy coder is a bug-free coder. =)
Well, I'd settle for "a happy coder is a more productive coder" :)

--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too
Sep 23 '07 #15
"Jon Skeet [C# MVP]" <sk***@pobox.comwrote in message
news:MP*********************@msnews.microsoft.com. ..
>
I don't think I'd ever go that far. I applied for my current job like
anyone else would. I've had a few jobs specifically offered to me, but
really not very many at all.
Maybe because the recruiters know you spend all your time here,
and are writing a book on top of that. *S*

But I get the feel that you are 'richer' doing that,
than any silly job-offer might offer.

I think it's reasonable not to trust CVs too far. I've seen a *lot* of
rubbish talked about on CVs. I'd never assume that someone can code
well just because they claim they can. Of course, if they've got sample
code on the net etc,
Nice self-promo
that helps - but it's better to see someone in action.
Double-promo.. Jon is on a killing-spree=)

As usually, jokes aside.
I do indeed like when people go:
- I code in this or that open source project
- I written this about techX on my blog.
>
>This thread is stuck on hiring.
Real programmers don't get hired,
they pick where to work.

Well, they still have to go for an interview - at least round here.
There was certainly no guarantee I'd get my current job.
Well sure.
I was not trying to say that it is the byers market.
Especially not in Sweden.

I was doing this from the employers perspective.
It is easy to hire someone,
but how do you get him/her to stay onboard?

Even if we would adopt slavery,
that would make hiring easy.
I know this for a 'fact',
as I play Civilization 4 way too much.

I am thinking of a dilbert strip where the
PHB points at some area of dilberts monitor
and goes: - Type some good code right there!

>>
A happy coder is a bug-free coder. =)

Well, I'd settle for "a happy coder is a more productive coder" :)
Hmm. Not really.
Productivity goes down,
but Effectivity goes up bigtime.
The overall Quality tends to be excellent.

I think we are looking for the word 'gumption',
and I cannot help to think about Zen and The Art Of Motorcycle Maintenance

- Michael Starberg

Sep 28 '07 #16
Michael Starberg <no@no.comwrote:
I don't think I'd ever go that far. I applied for my current job like
anyone else would. I've had a few jobs specifically offered to me, but
really not very many at all.

Maybe because the recruiters know you spend all your time here,
and are writing a book on top of that. *S*

But I get the feel that you are 'richer' doing that,
than any silly job-offer might offer.
Yeah - I'm very happy doing what I'm doing. I've always enjoyed having
a normal career and a side-line in community work and "extras" like the
book.
I think it's reasonable not to trust CVs too far. I've seen a *lot* of
rubbish talked about on CVs. I'd never assume that someone can code
well just because they claim they can. Of course, if they've got sample
code on the net etc,

Nice self-promo
Not intended, I assure you - but when I get a CV, I always try to look
the person up on the net.
that helps - but it's better to see someone in action.

Double-promo.. Jon is on a killing-spree=)
Not at all - by "in action", I mean "coding in front of you". If you
only ever see finished code, you've no idea how people think, how they
solve problems etc. The approaches rejected can be just as important as
the final approach taken.
As usually, jokes aside.
I do indeed like when people go:
- I code in this or that open source project
- I written this about techX on my blog.
Yes - I hear that kind of thing far too rarely :(
This thread is stuck on hiring.
Real programmers don't get hired,
they pick where to work.
Well, they still have to go for an interview - at least round here.
There was certainly no guarantee I'd get my current job.

Well sure.
I was not trying to say that it is the byers market.
Especially not in Sweden.

I was doing this from the employers perspective.
It is easy to hire someone,
but how do you get him/her to stay onboard?
I'd say it's easy to hire someone, but hard to hire someone *good*. I
rarely see a CV which immediately says to me, "Yeah, that's someone
with a spark."

<snip>
A happy coder is a bug-free coder. =)
Well, I'd settle for "a happy coder is a more productive coder" :)

Hmm. Not really.
Productivity goes down,
but Effectivity goes up bigtime.
The overall Quality tends to be excellent.
I view productivity as an overall package - not "lines of code written
per day" but including quality and maintainability.
I think we are looking for the word 'gumption',
and I cannot help to think about Zen and The Art Of Motorcycle
Maintenance
Ah, quality...

--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too
Sep 28 '07 #17
"Michael Starberg" <no@no.comwrote in message
news:%2****************@TK2MSFTNGP03.phx.gbl...
>
A happy coder is a bug-free coder. =)

Every time I hear this i think of the old saying:

Every multiline program can be reduced by at least one line.
Every program has at least one bug.
Therefore, every program can be reduced to one line that doesn't work.

(I think that was from an old unix qotd daemon...)

Boy...this thread got hijacked didn't it <g>
--
Doug Semler, MCPD
a.a. #705, BAAWA. EAC Guardian of the Horn of the IPU (pbuhh).
The answer is 42; DNRC o-
Gur Hfrarg unf orpbzr fb shyy bs penc gurfr qnlf, abbar rira
erpbtavmrf fvzcyr guvatf yvxr ebg13 nalzber. Fnq, vfa'g vg?

Sep 28 '07 #18
D W
I recently interview for a job where they asked me how many gas stations
there are in America. I got to an answer (out loud) and the interviewer
sat and worked through my logic with me. Once we were done with that,
he asked me to do it again, but a different way. It actually led to
some pretty interesting conversation. He also asked me to design the
functionality of an elevator, and he wanted to see me write a version of
strrev() (just so he knew I wasn't wasting his time).

One of the more interesting interviews I've ever had.

BTW, there were roughly 121,000 gas stations in America in 2004. The
number I ended up with was 150,000...which wasn't the point, but I still
got pretty close!

*** Sent via Developersdex http://www.developersdex.com ***
Sep 28 '07 #19

"D W" <gu******@hotmail.comwrote in message
news:uS**************@TK2MSFTNGP02.phx.gbl...
>I recently interview for a job where they asked me how many gas stations
there are in America. I got to an answer (out loud) and the interviewer
sat and worked through my logic with me. Once we were done with that,
he asked me to do it again, but a different way. It actually led to
some pretty interesting conversation. He also asked me to design the
functionality of an elevator, and he wanted to see me write a version of
strrev() (just so he knew I wasn't wasting his time).

One of the more interesting interviews I've ever had.

BTW, there were roughly 121,000 gas stations in America in 2004. The
number I ended up with was 150,000...which wasn't the point, but I still
got pretty close!

*** Sent via Developersdex http://www.developersdex.com ***
Haha, when I was reading this, I thought to myself..
- Hmm. maybe 150'000.

I'd be dead in the water at that interview,
as when he'd asked me how I came up with that number,
and I beleive it is a sin to lie, I'd had to reply
- Just guessed...

- Michael Starberg

Sep 29 '07 #20
Michael Starberg wrote:
I would never take a coding test.
If they want to hire me, then I ask for a offer.

If they ask for a code-example a la Joel,
we start out with a breach of trust, and per so,
I don't want the job.

This thread is stuck on hiring.
Real programmers don't get hired,
they pick where to work.
If you can get all the jobs you want, then you are
either extremely skilled (let us call it "Anders Hejlsberg level")
or not very ambitious.

Most people even good people may want the job that pays
better of has this interesting project and are willing
to do a test to get it.

Arne
Oct 5 '07 #21
D W wrote:
I recently interview for a job where they asked me how many gas stations
there are in America. I got to an answer (out loud) and the interviewer
sat and worked through my logic with me. Once we were done with that,
he asked me to do it again, but a different way. It actually led to
some pretty interesting conversation.
BTW, there were roughly 121,000 gas stations in America in 2004. The
number I ended up with was 150,000...which wasn't the point, but I still
got pretty close!
Actually it may not be a bad interview technique.

It will reveal whether the developer has the ability to think
about real problems.

It is not difficult to learn a programming a language or
an API.

The tricky part is to be able to go from problem to
solution.

Arne
Oct 5 '07 #22
"Arne Vajhøj" <ar**@vajhoej.dkwrote in message
news:47***********************@news.sunsite.dk...
If you can get all the jobs you want, then you are
either extremely skilled (let us call it "Anders Hejlsberg level")
or not very ambitious.
I agree, master of the obvious.
Most people even good people may want the job that pays
better of has this interesting project and are willing
to do a test to get it.
I agree, master of the obvious.
>
Arne
- Michael Starberg
Oct 6 '07 #23

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