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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. end
  33. class CalMultiply < Cal
  34.   def multiply()
  35.     result = @v1*@v2
  36.     @@_history.push("multipy : #{@v1}*#{@v2}=#{result}")
  37.     return result
  38.   end
  39. end
  40. class CalDivide < CalMultiply
  41.   def divide()
  42.     result = @v1/@v2
  43.     @@_history.push("divide : #{@v1}/#{@v2}=#{result}")
  44.     return result
  45.   end
  46. end
  47. c1 = CalMultiply.new(10,10)
  48. p c1.add()
  49. p c1.multiply()
  50. c2 = CalDivide.new(20, 10)
  51. p c2, c2.add()
  52. p c2, c2.multiply()
  53. p c2, c2.divide()
  54. Cal.history()
  55.  
Success #stdin #stdout 0.01s 7420KB
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stdin
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Standard input is empty
stdout
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20
100
#<CalDivide:0x87dec24 @v1=20, @v2=10>
30
#<CalDivide:0x87dec24 @v1=20, @v2=10>
200
#<CalDivide:0x87dec24 @v1=20, @v2=10>
2
"add : 10+10=20"
"multipy : 10*10=100"
"add : 20+10=30"
"multipy : 20*10=200"
"divide : 20/10=2"
https://ideone.com/cOSPJa
language:
Ruby (ruby 2.5.5)
created:
8 years ago
visibility:
public

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