program2.rb

if (5 + 5 == 10)
  puts 'this is true'
else
  puts 'this is false'
end

program3.rb

def choose
  puts 'Do you like programming? Yes, no or maybe please'
  choice = gets.chomp
  case choice.downcase
  when 'yes'
    puts "That\'s great!"
  when 'no'
    puts 'Too bad...'
  when 'maybe'
    puts 'Glad you are giving it a chance!'
  else 
    puts 'I have no idea what that means'
  end
end
choose

program4.rb

(0..10).each do |n|
  p "the new number is #{n}"
end