Problem 78. Implement a ROT13 cipher

Created by Cody Team

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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.

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Last Solution submitted on Apr 25, 2025

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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.

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Problem 78. Implement a ROT13 cipher

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Problem 78. Implement a ROT13 cipher

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