Question: In R programming, I used Caesar cipher to find the plain text fro C with the key 4. Rather than getting a letter, I got

In R programming, I used Caesar cipher to find the plain text fro "C" with the key 4. Rather than getting a letter, I got a "?". Why did this happen and how can I fix it? I have my code below

p <- utf8ToInt('C') n <- (p - 4) z <- (n %% 128) y <- intToUtf8(z)

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