2023-3: Caesar Salad
A Caesar cipher, also known as a shift cipher, is one of the simplest encryption techniques. In a Caesar cipher, each letter in the plaintext is replaced by a letter some fixed number of positions away in the alphabet, effectively "shifting" the alphabet.
Write a function that:
- takes a single integer left argument representing the size of the shift
- takes a character vector right argument representing the plaintext message
- returns a result with the same shape as the right argument representing the encrypted message
Notes:
- Use ' ',⎕A as the alphabet
- You can assume that the plaintext message will contain only characters found in the alphabet.
Hint: The rotate function ⌽ could be helpful in solving this problem.
Examples:
4 (your_function) 'HELLO WORLDS'
LIPPSD SVPHW
¯4 (your_function) 'HELLO WORLDS' ⍝ negative shifts are okay
DAHHKWSKNH O
0 (your_function) 'HELLO WORLDS' ⍝ no shift is okay
HELLO WORLDS
27 (your_function) 'HELLO WORLDS'
HELLO WORLDS
¯10 (your_function) '' ⍝ returns an empty vector
your_function ←
Solutions
