exam6.cpp

来自「C++语言程序设计题典」· C++ 代码 · 共 95 行

#include <iostream.h>
class vehicle  //定义汽车类
{
protected:
	int wheels;    //车轮数
	float weight;  //重量
public:
	vehicle(int wheels,float weight);
	int get_wheels();
	float get_weight();
	float wheel_load();
	void show();
};
class car : public vehicle   //定义小车类
{
	int passenger_load;  //载人数
public:
	car(int wheels,float weight,int passengers=4);
	int get_passengers();
	void show();
};
class truck : public vehicle  //定义卡车类
{
	int passenger_load;  //载人数
	float payload;       //载重量
public:
	truck(int wheels,float weight,int passengers=2,float max_load=240000.00);
	int get_passengers();
	float efficiency();
	void show();
};
vehicle::vehicle(int wheels,float weight)
{
	vehicle::wheels=wheels;
	vehicle::weight=weight;
}
int vehicle::get_wheels()
{
	return wheels;
}
float vehicle::get_weight()
{
	return weight/wheels;
}
void vehicle::show()
{
	cout << "    车轮:" << wheels << "个" << endl;
	cout << "    重量:" << weight << "公斤" << endl;
}
car::car(int wheels,float weight,int passengers):vehicle(wheels,weight)
{
	passenger_load=passengers;
}
int car::get_passengers()
{
	return passenger_load;
}
void car::show()
{
	cout << "  车型:小车" << endl;
	vehicle::show();
    cout << "    载人:" << passenger_load <<  "人" << endl;
	cout << endl;
}
truck::truck(int wheels,float weight,int passengers,float max_load): \
       vehicle(wheels,weight)
{
	passenger_load=passengers;
	payload=max_load;
}
int truck::get_passengers()
{
	return passenger_load;
}
float truck::efficiency()
{
	return payload/(payload+weight);
}
void truck::show()
{
    cout << "  车型:卡车" << endl;
	vehicle::show();
	cout << "    载人:" << passenger_load << "人" << endl;
	cout << "    效率:" << efficiency() << endl;
	cout << endl;
}
void main()
{
	car car1(4,2000,5);
	truck tru1(10,8000,3,340000);
	cout << "输出结果" << endl;
	car1.show();
	tru1.show();
}