perfect_number.rb

#encoding: utf-8

def is_perfect_number(number)
	sum = 0
	for i in  1 .. number
		if number % i == 0 then
			sum = sum + i
		end
	end
	if sum == 2 * number then 
		return true
	else
		return false
	end
end

print "数値を入力してください:"
input_number = gets.to_i
print "1から#{input_number}までには"
hit = 0
	for i in 1 .. input_number
		if is_perfect_number(i) == true then
			print "#{i} "
			hit = hit + 1
		end
	end
if hit == 0 then
	puts "完全数はありません"
else
	puts "という完全数があります"
end