还请帮忙，此程序有错误

module Adder
def add(operand_one,operand_two)
return operand_one+operand_two
end
end

module Subtracter
def subtract(operand_one,operand_two)
return operand_one-operand_two
end
end

class Calulator
include Adder
include Subtracter
end

calculator=Calculator.new()
puts "5+3="+calculator.add(5,3).php?name=to_s" onclick="tagshow(event)" class="t_tag">to_s
puts "5-3="+calculator.subtract(5,3).to_s

class Calulator
Calculator.new()
少了个"c"

有时候错误往往是自己打字造成,平时要多 CTRL+C,CTRL+V

谢谢兄台！！！！！！