c++实验四实验报告.doc

实验四实验报告 1.实验目的及要求 （1） 掌握单继承程序设计的基本方法。 （2） 掌握多继承程序设计的基本方法。 2.实验设备 计算机、Microsoft Visual C++ 3.实验内容 (1) 下面程序定义一个vehicle 类，并派生出car 和truck 两个派生类。 #includeiostream.h class vehicle { protected: int wheels; double weight; public: void initialize(int whls, double wght); int get_wheels() { return wheels; } double get_weight() { return weight; } double wheel_loading() { return weight/wheels; } }; class car: public vehicle { private: int passenger_load; public: void initialize(int whls, double wght, int people =4); int passengers() { return passenger_load; } }; class truck: public vehicle { private: int passenger_load; double payload; public: void init_truck(int number =2, double max_load =24000.0); double efficiency(); int passengers() { return passenger_load; } }; void vehicle::initialize(int whls, double wght) { wheels=whls; weight=wght; } void car::initialize(int whls, double wght, int people) { wheels=whls; weight=wght; passenger_load=people; } void truck::init_truck(int number, double max_load) { passenger_load=number; payload=max_load; } double truck::efficiency() { return payload/(payload+weight); } void main() { vehicle bicycle; bicycle.initialize(2,25); coutthe bicycle has bicycle.get_wheels() wheels.\n; coutthe bicycle weighs bicycle.get_weight() pounds.\n; coutthe bicycles wheel loading is bicycle.wheel_loading() pounds per tire.\n\n; car audi; audi.initialize(4,3500.0,5); coutthe audi has audi.get_wheels() wheels.\n; coutthe audi weighs audi.get_weight() pounds.\n; coutthe audis wheel loading is audi.wheel_loading() pounds per tire.\n\n; truck jief; jief.initialize(18,12500.0); person person teacher graduate in-service_graduate jief.init_truck(2,33675.0); coutthe jief has jief.get_wheels() wheels.\n; coutthe jief weighs jief.get_weight() pounds.\n; coutthe jiefs efficiency is 100.0*jief.efficiency() percent.\n; } [基本要求] ??上机录入、调试上面程序。 ??运行程序，观察运行结果是否正确且满足题意要求。 ??将class car: public vehicle 和class truck: public vehicle 分别改为： class car: private vehicle 和class truck: