Question: USING C++ You are asked to write a program that takes a shift value between +/- 26 and a plaintext message (no spaces) and returns

USING C++

You are asked to write a program that takes a shift value between +/- 26 and a plaintext message (no spaces) and returns the corresponding ciphertext. The program should also implement a decryption routine that reconstructs the original plaintext from the ciphertext.

Example usage

$ caesar Enter shift +/- 26: -3 Enter plaintext message (A-Z only, no spaces): THE ciphertext: QEB plaintext: THE

$ caesar Enter shift +/- 26: 1 Enter plaintext message (A-Z only, no spaces): ZZZ ciphertext: AAA plaintext: ZZZ

We assume that the user message only consists of uppercase English alphabet (A-Z).

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