Find the biggest primefactor using class

primefactor using class.rb

#to find the biggest prime number
class Prime
	def initialize(num)
		puts "input value is #{num}"
	end
def primefactor(n)
	i=2
	largest=0
	while(i<=n)
		if(n%i==0)
			while(n%i==0)
				n=n/i
				largest=i
				i+=1
			end
		end
		i+=1
	end
	return largest

end
end
obj=Prime.new(600851475143)
big=obj.primefactor(600851475143)
puts "the biggest prime number is #{big} "
=begin
output:
	the biggest prime number is 6857 
=end