Programming Exercise

general2.rb

=begin

Exercise:

Write a function that takes a string and returns a rot13 version 
of that string with every other word reversed. If the function is 
f, f(f(x)) should return x.  Remember to take non-alphanumeric 
non-alphanumeric characters into account.

Example Input: “Hello world!”
Example Output:”byyrU jbeyq!”

=end


#Assuming non-alphabetical characters can also
#be reversed - e.g., '$%@!' in an odd position
#produces '!@%$' - then:

def rot(rotateMe)
    rotated=""
    reversed= Array.new
    rotateMe.bytes.to_a.each do |c|
        if (c>=65 && c<=77) || (c>=97 && c<=109) then 
          c+=13
        elsif(c>77 && c<=90)|| (c>109 && c<=122) then
          c-=13
        end
        rotated+=c.chr
    end
    reversed = rotated.split;
    reversed.each_with_index do |word, i|
      if i%2==0 then
        reversed[i]=word.reverse
      else
        reversed[i]=word
      end
    end
    return reversed.join(' ');
end