Problem 45. Make a Palindrome Number

Created by Cody Team

Solve Later

{"relationships":[{"relationshipType":"http://schemas.mathworks.com/matlab/code/2013/relationships/document","targetMode":"","relationshipId":"rId1","target":"/matlab/document.xml"},{"relationshipType":"http://schemas.mathworks.com/matlab/code/2013/relationships/output","targetMode":"","relationshipId":"rId2","target":"/matlab/output.xml"}],"parts":[{"partUri":"/matlab/document.xml","relationship":[],"contentType":"application/vnd.mathworks.matlab.code.document+xml","content":"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<w:document xmlns:w=\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\"><w:body><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Some numbers like 323 are palindromes. Other numbers like 124 are not. But look what happens when we add that number to a reversed copy of itself.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[    124\n  + 421\n   ----\n    545]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Let's try another.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[    150\n  + 051\n   ----\n    201]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>No, that didn't work, but what if we keep going?</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[    201\n  + 102\n   ----\n    303]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>There, it became a palindrome again. Given a, return b = find_palindrome(a) such that b is the palindrome number that eventually results from repeated reversals and additions of a.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Example:</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[ Input  a = 150\n Output b is 303]]></w:t></w:r></w:p></w:body></w:document>"},{"partUri":"/matlab/output.xml","contentType":"text/xml","content":"<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\" ?><embeddedOutputs><metaData><evaluationState>manual</evaluationState><layoutState>code</layoutState><outputStatus>ready</outputStatus></metaData><outputArray type=\"array\"/><regionArray type=\"array\"/></embeddedOutputs>"}]}

Solve

Solution Stats

3248 Solutions
1530 Solvers

Last Solution submitted on Jul 29, 2021

Last 200 Solutions

Problem Comments

4 Comments

4 Comments

Show 1 older comment

Chintan on 21 Mar 2013

Why is seqreverse command not allowed to work?

Ned Gulley on 21 Mar 2013

That function is in the Bioinformatics Toolbox (http://www.mathworks.com/help/bioinfo/ref/seqreverse.html). Cody permits only MATLAB functions.

Rohit Garud on 31 Jul 2017

Many commands I thought would work ,didn't .... This problem helps in understanding the limits of the commands

Rafael S.T. Vieira on 10 Jun 2020

Can every number be used to find a palindrome? I've tried 196, and it seems to run on an infinite loop.

Solution Comments

Solution 1513031

1 Comment

1 Comment

Ryan Mitchell on 2 May 2018

Recursion is great

Solution 711373

2 Comments

2 Comments

amin nazari on 6 Aug 2015

very nice!!

Rohit Garud on 31 Jul 2017

Many commands I thought would work ,didn't .... This problem helps in understanding the limits of the commands

Solution 231787

1 Comment

1 Comment

Gwendolyn Fischer on 17 Apr 2013

Just a proof of concept, no real improvement thought.

Solution 158280

2 Comments

2 Comments

Claudia on 16 Nov 2012

The flip, of course! Thanks!

santosh singh on 26 Oct 2014

flip is not going to wrk for a particular int

Problem Recent Solvers1530

Problem Tags

strings

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Problem 45. Make a Palindrome Number

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers1530

Suggested Problems

More from this Author95

Problem Tags

Community Treasure Hunt

Problem 45. Make a Palindrome Number

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers1530

Suggested Problems

More from this Author95

Problem Tags

Community Treasure Hunt

Players