9.5.2.rb

=begin
I = 1
V = 5
X = 10
L = 50
C = 100
D = 500
M = 1000
=end


  
num = 0  #initial num

while num < 1 || num > 3000
	puts ' Enter a number between 1 and 3000'
	num = gets.chomp.to_i
	if num < 1 || num > 3000
		puts 'Out of range'
	elsif num >= 1 && num <= 3000
		puts 'Range OK!'
	else
		puts 'ERROR!!'
	end		
end

#puts num
def old_roman_numeral numt
	ronum = ['M' ,'D' ,'C' ,'L' ,'X' ,'V' ,'I']
	roval = [1000 ,500 ,100 ,50 ,10 ,5 ,1]
	temp = []
	i = 0
	while numt != 0
		muti = numt / roval[i]
		muti.times do
			temp.push ronum[i]
			#puts ronum[i]
		end
	numt = numt % roval[i]
	i = i + 1
	end
	temp.join
end

def roman_numeral numt
	ronum = ['I' ,'V' ,'X' ,'L' ,'C' ,'D' ,'M']
	roval = [1,5,10,50,100,500,1000]
	temp  = []
	roMAX = roval.length
	i = 3 # 1000 100 10 1
	while i >= 0


		tar = ( numt - ( numt % 10**i ) ) / 10**i
		

		if i == 3
			tar.times do
				temp.push 'M'
			end
		#puts 'i = ' + i.to_s + ' temp = ' + temp.to_s + ' tar = ' + tar.to_s
		else

			if tar == 0 
				#puts 'do nth' 
			elsif tar > 0 && tar <= 3
				tar.times do
					temp.push ronum[0+2*i]
				end
			elsif tar == 4
				temp.push ronum[0+2*i]
				temp.push ronum[1+2*i]
			elsif tar == 5
				temp.push ronum[1+2*i]
			elsif tar >= 6 && tar <= 8
				temp.push ronum[1+2*i]
				(tar-5).times do
				temp.push ronum[0+2*i]
				end
			elsif tar == 9
				temp.push ronum[0+2*i]
				temp.push ronum[2+2*i]
			else
				puts 'ERROR!!!!'
			end

			#puts 'i = ' + i.to_s + ' temp = ' + temp.to_s + 'tar = ' + tar.to_s
		end
	numt = numt % 10**i
	i = i - 1

	end
	temp.join
end

ans = old_roman_numeral(num)
puts 'old_roman_numeral = ' + ans.to_s
ans = roman_numeral(num)
puts 'roman_numeral = ' + ans.to_s