caesar_cypher.rb

puts "What is the string to be cyphered?"
string = gets.chomp

puts "Number of positions to shuffle:"
n = gets.chomp.to_i

def caesar_cypher(string, n)
  new_string = ''

  string.each_char do |c|
      code = c.ord

      # If lower case
      if (code <= 122 && code >=97)
        code = ((code - 97 + n) % 26) + 97

      # If upper case
      elsif (code <= 90 && code >= 65)
        code = ((code - 65 + n) % 26) + 65
      end

      c = code.chr
      new_string += c
  end
  new_string
end

puts "Cyphered string: " + caesar_cypher(string, n)

# "a".ord = 97
# "z".ord = 122
# "A".ord = 65
# "Z".ord = 90