Sams Teach Yourself C++ in 21 Days

Advanced Inheritance 573

16

34: public:

35: CarPart():itsModelYear(94){}

36: CarPart(int year, int partNumber);

37: virtual void Display() const

38: {

39: Part::Display();

40: cout << “Model Year: “;

41: cout << itsModelYear << endl;

42: }

43: private:

44: int itsModelYear;

45: };

46:

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

48: itsModelYear(year),

49: Part(partNumber)

50: {}

51:

52:

53: // **************** AirPlane Part ************

54:

55: class AirPlanePart : public Part

56: {

57: public:

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

59: AirPlanePart(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(int EngineNumber, int PartNumber):

71: itsEngineNumber(EngineNumber),

72: Part(PartNumber)

73: {}

74:

75: // **************** Part Node ************

76: class PartNode

77: {

78: public:

79: friend class PartsList;

80: PartNode (Part*);

81: ~PartNode();

82: void SetNext(PartNode * node)

83: { itsNext = node; }

84: PartNode * GetNext() const;

85: Part * GetPart() const;

LISTING16.7 continued