cc_check.rb

p "hey there give us a CC #"
cc_number = gets.chomp

def check_type(cc_number)

	type = "Unknown"
	type_check = cc_number[0..1].to_i

	case type_check
	when 34, 37
		type = "AMEX" unless cc_number.length != 15
	when 51..55
		type = "MasterCard" unless cc_number.length != 16
	when 60
		type = "Discover" unless cc_number[2..3] != "11" && cc_number.length != 16
	when 40..49
		type = "VISA" unless cc_number.length != 13 && cc_number.length != 16
	end

	type

end

def check_valid(cc_number)
	
	valid = "invalid"
	valid_check = cc_number.reverse.chars
	
	valid_check.map!.with_index do |n, i|
		if i % 2 != 0 then n.to_i * 2 else n.to_i end
	end

	valid_check.map! do |n|
		if n > 9 then n.to_s.chars.map(&:to_i) else n end
	end

	valid = "valid" unless valid_check.flatten.sum % 10 != 0

	valid

end

def results(type, valid, cc_number)
	p "#{type}: #{cc_number}   (#{valid})"
end

results(check_type(cc_number), check_valid(cc_number), cc_number)