Problem 78. Implement a ROT13 cipher

Created by Cody Team

Solve Later

Replace each character in string s1 with the character that is shifted 13 positions from it (wrap back to the beginning if necessary). So A ? N, B ? O, and so on until Y ? L and Z ? M. Case of the output should match the case of the input, so a ? n. Non-alphabetic characters are left in place and untouched.

 s1 = 'I love MATLAB'

then

 s2 = 'V ybir ZNGYNO'

See the Wikipedia article for more info.

Solve

Solution Stats

2858 Solutions
1695 Solvers

Last Solution submitted on Jul 16, 2025

Last 200 Solutions

Problem Comments

3 Comments

3 Comments

Miles Walker on 15 Nov 2019

Why does the "t" not change in the second word of the second test? The correct answer has an unchanged "t"?

Yin on 18 Mar 2020

I'm wondering the same thing. The letters in the second word are not rotated!

Yin on 18 Mar 2020

OK, I see that the '& l t ;' is the < symbol, therefore, the group of four chars should stay together and not be changed, but that requires an interpretation of the input string as opposed to using the input string as is.

Solution Comments

Show comments

Problem Recent Solvers1695

Problem Tags

Community Treasure Hunt

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

Start Hunting!

Problem 78. Implement a ROT13 cipher

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers1695

Suggested Problems

More from this Author96

Problem Tags

Community Treasure Hunt

Problem 78. Implement a ROT13 cipher

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers1695

Suggested Problems

More from this Author96

Problem Tags

Community Treasure Hunt

Players