Sams Teach Yourself C++ in 21 Days

Advanced Inheritance 555

16

36: virtual void Display() const

37: {

38: Part::Display();

39: cout << “Model Year: “;

40: cout << itsModelYear << endl;

41: }

42: private:

43: int itsModelYear;

44: };

45:

46: CarPart::CarPart(int year, int partNumber):

47: itsModelYear(year),

48: Part(partNumber)

49: {}

50:

51:

52: // **************** AirPlane Part ************

53:

54: class AirPlanePart : public Part

55: {

56: public:

57: AirPlanePart():itsEngineNumber(1){};

58: AirPlanePart

59: (int EngineNumber, int PartNumber);

60: virtual void Display() const

61: {

62: Part::Display();

63: cout << “Engine No.: “;

64: cout << itsEngineNumber << endl;

65: }

66: private:

67: int itsEngineNumber;

68: };

69:

70: AirPlanePart::AirPlanePart

71: (int EngineNumber, int PartNumber):

72: itsEngineNumber(EngineNumber),

73: Part(PartNumber)

74: {}

75:

76: // **************** Part Node ************

77: class PartNode

78: {

79: public:

80: PartNode (Part*);

81: ~PartNode();

82: void SetNext(PartNode * node)

83: { itsNext = node; }

84: PartNode * GetNext() const;

85: Part * GetPart() const;

86: private:

87: Part *itsPart;

LISTING16.5 continued