How to shift characters to ASCII values in a file based on user input c++ [closed]

A simple implementation of the Caesar Cipher is to use a string of valid characters and the remainder operator, %.

char Encrypt_Via_Caesar_Cipher(char letter, unsigned int shift)
{
  static const std::string vocabulary = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
  const std::string::size_type position = vocabulary.find(letter);
  char c = letter;
  if (position != std::string::npos)
  {
     const std::string::size_type length = vocabulary.length();
     c = vocabulary[(position + shift) % length];
  }
  return c;
}

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