Given the input n, return true if n is odd or false if n is even.
Solution Stats
Problem Comments
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36 Comments
Show
33 older comments
Ned Gulley
on 30 Jan 2012
Added several more tests to limit hard-coded answers.
Matthew Circe
on 12 Feb 2012
When they say return "true" they mean "1", and "false" means "0". Newbie mistake.
per isakson
on 15 Apr 2012
Add a couple of negative values to the test.
per isakson
on 15 Apr 2012
Test for a couple of negative values
per isakson
on 15 Apr 2012
Delete comment doesn't work!
Nolan
on 27 Sep 2013
I don't know what I am doing wrong. I tried it in Matlab and seems to work fine
y = rem(x,2);
if y == 1
disp('true')
else
disp('false')
end
Prateek Reddy
on 9 Oct 2013
it should be clearly specified that we should not type in the string true but if we give true to a variable then it takes it as 1
Jon
on 13 Nov 2013
All solutions with score 10 use the regexp cheat.
Ryan
on 27 Feb 2014
I don't understand why my code isn't working?
if mod(n,2) == 1
tf = 'true'
else
tf = 'false'
end
ipek
on 26 Mar 2014
function tf = is_odd(n)
if rem(n,2)== 0
tf = 'false'
else
tf = 'true'
end
end
why is this not working?
John
on 30 Jul 2014
I bet all the solutions not using if else are all from engineering backgrounds with intimate knowledge of boolean logic
Clementina Reynolds
on 8 May 2015
ipek: you only need one end.
Clementina Reynolds
on 8 May 2015
Nolan: you aren't using the variables provided
Harry Schwester
on 7 Jun 2015
eine interessante Frage...
Xiaolong zheng
on 11 Jun 2015
Persistent server error trying to evaluate this solution...
David Lavoie
on 23 Dec 2015
Hello it's me
Augusto Montani
on 28 Jan 2016
Nice one
Shaun Kuo
on 13 Oct 2016
Good one.
Jay Shah
on 6 Dec 2016
Nice problem
Kunwar Abdul Rahman
on 27 Dec 2016
nice
SIVAPRAKASH DANABALASINGAM
on 10 Jan 2017
good job
Steven M
on 29 Mar 2017
horrible problem
omar malik
on 3 Sep 2017
good
Vikas Kumar Singh
on 12 Nov 2017
great
Hassan Mehmood Khan
on 13 Nov 2017
good problem
Adam Gould
on 3 Dec 2017
Great problem
Ian Boone
on 6 Dec 2017
great prob
Anish Navalgund
on 29 Mar 2018
Easy one.
christopher Minix
on 24 Apr 2018
kool
Josh Natanson
on 9 May 2018
Easy enough that I can do it!
konrad rynkowski
on 10 May 2018
badge
Pinkesh Narsinghani
on 26 May 2018
easy
utkarsh singhvi
on 21 Jun 2018
how to reduce size
i have the size of 28
Dylan Zerfoss
on 29 Nov 2018
Good Problem
Jarhed Szalkowski
on 29 Nov 2018
Pretty Easy. Thanks!
Arjun
on 17 Jan 2019
Good use of the modulo operator. Took some quick presence of mind to realise how to use it, but it is definitely quick to crack.
Advice: Don't overthink it!
Solution Comments
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1 Comment
zachary ernst
on 11 Jul 2018
great problem
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1 Comment
Tiago Dias
on 12 Apr 2018
what is wrong here?
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1 Comment
Matthew McDonnell
on 28 Sep 2017
help aha?
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2 Comments
Matthew McDonnell
on 28 Sep 2017
come on really? whats wrong with this?
Ned Gulley
on 29 Sep 2017
You need to assign your answer to the output variable tf.
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1 Comment
Matthias Witkowski
on 8 Aug 2017
...
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3 Comments
Sreya Nambiar
on 11 Apr 2017
why is this solution incorrect?
Jean-Marie Sainthillier
on 11 Apr 2017
I think there is a problem with the Cody server since yesterday.
Aditya Jain
on 11 Apr 2017
Apologies for the down time. It should be working now
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1 Comment
Guvanch Gurbandurdyyev
on 25 Mar 2017
so easy
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2 Comments
usharani choudhury
on 23 Feb 2017
I have tried many times this one. It runs fine but I am not able to understand why is it showing as wrong solution.
Can anybody help on this?
DilRavsh
on 18 Aug 2017
Remove the single quotes in true/false. It might work. ☺
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1 Comment
Qin
on 10 Feb 2017
function tf = is_it_odd(n)
if mod(n,2)==0
tf = 'false';
else
tf = 'ture';
end
why assertion failed. it works in matlab.
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1 Comment
SIVAPRAKASH DANABALASINGAM
on 10 Jan 2017
very easy
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1 Comment
Devan Rao
on 10 Jan 2017
good
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1 Comment
Devan Rao
on 10 Jan 2017
easy
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1 Comment
Devan Rao
on 10 Jan 2017
good job
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2 Comments
Devan Rao
on 10 Jan 2017
good
SIVAPRAKASH DANABALASINGAM
on 10 Jan 2017
good job
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2 Comments
TAYALAN SIVALINGAM
on 29 Dec 2016
gj
SIVAPRAKASH DANABALASINGAM
on 10 Jan 2017
good job
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2 Comments
haziq hadi
on 27 Dec 2016
too demanding
SIVAPRAKASH DANABALASINGAM
on 10 Jan 2017
good job
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3 Comments
Tamir Suliman
on 29 Nov 2016
my solution was right and i tested it i m not sure what is going on
function [tf] = is_it_odd(n)
if rem(n,2)>0
tf='true';
else
tf='false';
end
end
nour eddin
on 24 Dec 2016
my answer correct
SIVAPRAKASH DANABALASINGAM
on 10 Jan 2017
good job
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2 Comments
Steven He
on 25 Aug 2016
How can be a smaller size? tf = rem(n,2)
SIVAPRAKASH DANABALASINGAM
on 10 Jan 2017
good job
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2 Comments
chibole
on 21 Jul 2016
Had cofused mod with % in python
SIVAPRAKASH DANABALASINGAM
on 10 Jan 2017
good job
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2 Comments
Md Sumon
on 18 Jul 2016
What is the problem here?
SIVAPRAKASH DANABALASINGAM
on 10 Jan 2017
good job
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2 Comments
Christian Fong
on 14 Jul 2016
this work on matlab but not here, why?
SIVAPRAKASH DANABALASINGAM
on 10 Jan 2017
good job
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3 Comments
Guy Giesa-Wilson
on 30 Jun 2016
My code works but it fails the test suite despite it giving the correct output. What's the deal?
Jan Orwat
on 30 Jun 2016
true, not 'true', false, not 'false'
SIVAPRAKASH DANABALASINGAM
on 10 Jan 2017
good job
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1 Comment
Justin Huber
on 15 Apr 2016
Assertation failed.
Code works perfectly on my computer.
Must be a bug with this particular problem.
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4 Comments
Show
1 older comment
Jonathan Perry
on 26 Jan 2016
It seems to provide the desired solution. Could anyone tell me why this is an incorrect solution?
yao gang
on 8 Jul 2016
The output should be logical,and it should't be char type:
function tf = is_it_odd(n)
x = n/2;
y = floor(x);
if x == y
tf = false;
else
tf = true;
end
end
SIVAPRAKASH DANABALASINGAM
on 10 Jan 2017
good job
Vivek Singh
on 14 Nov 2018
good solution
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3 Comments
Jonathan Perry
on 19 Jan 2016
Does anyone know why this doesn't answer the problem? When worked out in matlab it works just fine.
Jan Orwat
on 20 Jan 2016
1. do not use "input(...)", "n" is defined variable and input doesn't return anything. 2. "=" is used for assignments, not for comparisions. This one returns syntax error in line 3 (if ...), use "==" instead. 3. Output should be logical, not string. Use "false" instead of "'false'" etc. 4. Return the output via variable specified for it in first line of the function, in this case it is "tf". Do not use "fprintf" for that. 5. Read The Friendly Manual. Just type "doc" in Command Window - there are tons of documentation, tutorials.
SIVAPRAKASH DANABALASINGAM
on 10 Jan 2017
good job
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2 Comments
Stephen
on 17 Jul 2015
This solution works offline?
SIVAPRAKASH DANABALASINGAM
on 10 Jan 2017
good job
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10 Comments
Show
7 older comments
virgilcaine
on 28 Dec 2015
How does this help anyone? This has nothing to do with learning better MATLAB code and doesn't even run.
sakz
on 3 Jan 2016
This is not useful. What a waste of time...!
hubert andre
on 13 Apr 2016
Can you please explain how that solution work? thanks
Ali Jamali
on 17 Apr 2016
On the positive side of it, I'm very happy not to see people blindly copy pasting the above solution for every problem. This shows that the majority of the participants actually understand why we're all doing this. BTW, smart workaround!
Jason
on 7 Jul 2016
Hi Ali, what is the workaround your speaking of? I am very confused by this solution, but I would like to understand it.
Sasha Petrenko
on 21 Jul 2016
Even though it doesn't solve the actual problem, I thought this solution was clever enough (without too many copy-pastes by others, or maybe MathWorks fixed this workaround since then) to merit explaining it.
For those wondering, the line of code within the is_it_odd function does the following:
1. It does a system call to echo a single line to the standard i/o (a virtual place where programs can share/exchange their inputs and outputs).
2. The single line is in the form of a Matlab inline function, named assert(), that black-holes any inputs and always outputs the boolean 'true.'
3. The system call takes this single inline Matlab function and replaces the contents of assert.m (of whatever structure/setup for Matlab interpretation that Cody uses) with that single line.
4. Cody checks solutions with a series of assert(isequal(stuff,things)) calls, which now always evaluate to be true in this particular instance, as opposed to actually comparing if 'stuff' and 'things' are the same.
SIVAPRAKASH DANABALASINGAM
on 10 Jan 2017
good job
Lindross
on 12 Jun 2017
Nice work on a creative solution that has the "smallest size" per Cody's grading criteria. However, as a beginner to MATLAB, I don't see why I would want to write something this long/complex when there are much shorter solutions (perhaps not per Cody's criteria but they use less characters). I guess it's all about winning the contest.
Tang
on 12 Aug 2017
want to how can be size 9
Ni Yiyu
on 5 Feb 2018
9...............how can you do that......
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2 Comments
Hosain Al Musanna
on 27 Apr 2015
I tried this in my pc, all results appear as it is in your ans_correct.
SIVAPRAKASH DANABALASINGAM
on 10 Jan 2017
good job
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3 Comments
Kehkashan Saleem
on 26 Nov 2014
what is wrong with the solution?
James
on 26 Nov 2014
You're returning the string "true" or "false" which the test suite is trying to compare to a boolean variable true or false. Since the string does not equal the boolean value, assert fails.
SIVAPRAKASH DANABALASINGAM
on 10 Jan 2017
good job
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2 Comments
NC
on 12 Oct 2014
% i mean that: test = is_it_odd; :D
SIVAPRAKASH DANABALASINGAM
on 10 Jan 2017
good job
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2 Comments
Dimitrios
on 18 Sep 2014
Why is function "odd" not working?
SIVAPRAKASH DANABALASINGAM
on 10 Jan 2017
good job
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3 Comments
Shriramprasad Venkatesan
on 30 Aug 2014
Is this code wrong?
tf=floor(n/2)*2==n
Sanjay Lodwal
on 10 Oct 2014
yup
SIVAPRAKASH DANABALASINGAM
on 10 Jan 2017
good job
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2 Comments
Tim
on 19 Aug 2014
How could i get this any shorter?
SIVAPRAKASH DANABALASINGAM
on 10 Jan 2017
good job
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3 Comments
A Matlab User
on 24 Jul 2014
Why is this solution not working?? works on my matlab 2014 version!!
Tim
on 24 Jul 2014
I think the ' ' characters might be the problem.
SIVAPRAKASH DANABALASINGAM
on 10 Jan 2017
good job
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2 Comments
CHEONNO LEE
on 2 Feb 2014
it should use mod.
SIVAPRAKASH DANABALASINGAM
on 10 Jan 2017
good job
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2 Comments
Mohammed
on 19 Jan 2014
realized my true/false assignments were off. They should be reverse...if mod(n,2) ~= 0; tf=true; else tf = false; end
SIVAPRAKASH DANABALASINGAM
on 10 Jan 2017
good job
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1 Comment
no shortcut
on 24 Dec 2013
can anyone tell me better solution than this?
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1 Comment
Bekir Sait
on 17 Dec 2013
Well done brother :)
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1 Comment
Michal
on 22 Aug 2013
function tf = is_it_odd(n)
mod(n,2);
end
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1 Comment
Kanchibhotla Chandra Sekhar
on 6 Aug 2013
This is called cheating....Even this code is failed
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1 Comment
SAJJAD
on 10 Aug 2013
for 21 size. little editing :)
function ans = is_it_odd(n)
if mod(n,2)==0; false;
else
true
end
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1 Comment
Devin
on 17 Sep 2013
bugger
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1 Comment
Tobias Østergren
on 17 Mar 2013
I think the assertion is flawed, because
isequal(is_it_odd(2),true) == true == 1
returns
ans = 1
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1 Comment
Chintan
on 13 Mar 2013
Here, false and 0 (as double) mean same.
Also true and 1 (as double) mean same.
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1 Comment
sea knowledge
on 11 Dec 2012
what the matter,such an easy problem prevent me from continuing solving the following problems,so why,l can't accept the format of the solver function,it is so stupid,it is not flexible,l can't stand
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1 Comment
Mark Whirdy
on 12 Jul 2012
this returns "1" & not "true", but the validation for this cody problem is spurious since isequal(true,1) is actually true (when it should really throw an error).
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2 Comments
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2 Comments
Bryce
on 2 Feb 2012
Seems to me that the "best" answer would be tf = logical(mod(n,2)). But I guess the description does not explicitly require logicals, so maybe I am reading too much into the problem. Using logical makes the solution 17 compared to 13 without.
Adrian Dronca
on 7 Mar 2013
by calling logical function you add extra code.
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2 Comments
Hans-Martin
on 30 Jan 2012
I'am bad!
Adrian Dronca
on 7 Mar 2013
I don't think you know what odd/even means.
odd = 1 3 5 ...
even = 2 4 6 ...
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1 Comment
Benjamin Kraus
on 28 Jan 2012
I know this isn't correct, only submitted it because I couldn't figure out how it was possible to solve the problem with code size 12, and wanted to see the solution, only to find out that the 'leading solution' was wrong.
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3 Comments
Sripathi Sriharsha
on 27 Jan 2012
Does it work if n=3 or greater??
Pretty confusing!!
uri
on 29 Jan 2012
Ofcourse not, the problem with cody is that you can see the unit test.
Ned Gulley
on 30 Jan 2012
But the good thing about Cody is that you can update the test suite. Thanks for the comments, and please keep flagging bad tests so we can fix them.
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1 Comment
Benjamin Kraus
on 28 Jan 2012
This doesn't return a logical 'true' or 'false'.
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1 Comment
Alex Feinman
on 25 Jan 2012
Persistent server error trying to evaluate this solution...
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1 Comment
Jim Hokanson
on 25 Jan 2012
Hooray for ambiguous classing requirements.
How about this for the "best" solution:
x_odd = x(is_it_odd(x)); % :/
The answer should be logical(mod(n,2)).
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