yakubun

yakubun.rb

#!/usr/bin/env ruby
#-*- encoding:utf-8 -*-

def eukeides(m,n)
	loop do
		r = m % n
		if r == 0 then
			return n
		end
		m = n
		n = r
	end
end

bs = Array.new

if ARGV.size != 2 then
	print "分母を入力してください :"
	bs[0] = STDIN.gets.to_i
	print "分子を入力してください :"
	bs[1] = STDIN.gets.to_i
else
	bs[0] = ARGV[0].to_i
	bs[1] = ARGV[1].to_i
end

ans = Array.new(bs)
r = 0
begin
while(r != 1)
	r = eukeides(ans[0],ans[1])
	ans[0] = ans[0] / r
	ans[1] = ans[1] / r
end
rescue ZeroDivisionError
	puts "入力された数値が不正です"
	exit 1
end

puts bs[1].to_s + " / " + bs[0].to_s +  " = " + ans[1].to_s + " / " + ans[0].to_s