ruby - Undefined method NoMethodError -

i playing around w/ruby , attempting create function reason not working way thought would. not sure why i'm having problem here code :

class script   print "enter number: "   number = gets    def random (temp)       puts "#{temp}"       puts "inside function"   end    random (number) end 

error :

script.rb:13:in `<class:script>': undefined method `random' script:class (nomethoderror) script.rb:1:in `<main>' 

the problem is, define random method instance method, try call on class level. have 2 options fix this:

make class method (note self):

class script   def self.random(temp)     puts "#{temp}"     puts "inside function"   end    print "enter number: "   number = gets    random(number) end 

or make method create instance first (note new):

class script   def random(temp)     puts "#{temp}"     puts "inside function"   end    print "enter number: "   number = gets    new.random(number) end