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  1. class Cal
  2.   attr_reader :v1, :v2
  3.   attr_writer :v1
  4.   @@_history = []
  5.   def initialize(v1,v2)
  6.     @v1 = v1
  7.     @v2 = v2
  8.   end
  9.   def add()
  10.     result = @v1+@v2
  11.     @@_history.push("add : #{@v1}+#{@v2}=#{result}")
  12.     return result
  13.   end
  14.   def subtract()
  15.     result = @v1-@v2
  16.     @@_history.push("subtract : #{@v1}-#{@v2}=#{result}")
  17.     return result
  18.   end
  19.   def setV1(v)
  20.     if v.is_a?(Integer)
  21.       @v1 = v
  22.     end
  23.   end
  24.   def getV1()
  25.     return @v1
  26.   end
  27.   def Cal.history()
  28.     for item in @@_history
  29.       p item
  30.     end
  31.   end
  32.   def info()
  33.     return "Cal => v1 : #{@v1}, v2 : #{@v2}"
  34.   end
  35. end
  36. class CalMultiply < Cal
  37.   def multiply()
  38.     result = @v1*@v2
  39.     @@_history.push("multipy : #{@v1}*#{@v2}=#{result}")
  40.     return result
  41.   end
  42.   def info()
  43.     return "CalMultiply => #{super()}"
  44.   end
  45. end
  46. class CalDivide < CalMultiply
  47.   def divide()
  48.     result = @v1/@v2
  49.     @@_history.push("divide : #{@v1}/#{@v2}=#{result}")
  50.     return result
  51.   end
  52.   def info()
  53.     return "CalDivide => #{super()}"
  54.   end
  55. end
  56. c0 = Cal.new(30, 60)
  57. p c0.info()
  58. c1 = CalMultiply.new(10, 10)
  59. p c1.info()
  60. c2 = CalDivide.new(20, 10)
  61. p c2.info()
  62.  
Success #stdin #stdout 0.05s 9736KB
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"Cal => v1 : 30, v2 : 60"
"CalMultiply => Cal => v1 : 10, v2 : 10"
"CalDivide => CalMultiply => Cal => v1 : 20, v2 : 10"
https://ideone.com/Wwq1ST
language:
Ruby (ruby 2.5.5)
created:
8 years ago
visibility:
public

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