This is in the C Programming Language. I understand how to do so using loops but the question specifically says not to do so.

There are many ways to "encrypt" data so that it cannot be read by others. One very simple (and very weak) form of encryption is ROT13. This idea is to replace each letter in the message by the letter that is 13 places further down in the alphabet. For example, 'A' is replaced by 'N', 'B' is replaced by 'O', etc. This process "wraps around" back to the front of the alphabet is needed, so ' M ' is replaced by ' Z ' and ' N ' is replaced by 'A', and 'O' if replaced by ' B ', etc. ROT is shorthand for "rotate". Let c be a character variable: char c = some-upper-case-letter-here Write an expression that will assign to c its new value under the ROT13 encryption scheme. That is, you should fill in the right-hand-side of the code below: char rotated_c = some arithmetic expression here ...; Recall that we saw that we can do arithmetic with character data. HINT: it is helpful to use the modulo (\%) operator. You can write a small program to test your code. You should not use a loop to solve this problem (that is overkill)