Question

跪求C++派生类的两个程序。。。。。

1. 定义一个哺乳动物类Mammal, 有体重weight和年龄age两个成员变量, 再由此派生出狗类Dog, 有新成员color, 定义有参数的基类和派生类的构造函数，在main中使用Dog类。
2. 定义一个车辆(vehicle)基类，具有MaxSpeed等成员变量，Run和Stop等成员函数，由此派生出自行车(bicycle)类、汽车(motorcar)类。自行车类有高度(height)等属性，汽车类有座位数(Seat)等属性。从bicycle和motorcar派生出摩托车(motorcycle)类。在main中使用这三个类，注意使用虚基类。 （每句后面有注释最好，答对给分！！人格担保！！！1）

Answer 1

class Mammal
{
public:
Mammal(float w,int a)
{weight=w;age=a;}
protected:
float weight;
int age;
};
class Dog:public Mammal{
public:
Dog(float w,int a,int c)
{weight=w;age=a;color=c;}
void print()
{cout<<weight<<age<<c;}
protected:
int color;
};
void main()
{
Dog dog(2.4,2,23);
dog.print();
} //这一个简单，自己看吧

class vehicle{

public:
vehicle(float spd=0);
virtual void run(float s);
virtual void Stop()＝0;// 这是抽象类，不能定义对象。
protected:
float MaxSpeed;
float speed;
};

class bicycle:virtual public vehicle{
//bicycle为从vehicle继承的虚基类
public:
bicycle(){height=80; speed=60;} }
void run(){cout<<"bicycle run"<<speed;} //虚函数
void Stop(){speed=0;} //虚函数
protected:
float height;
};
class motorcar:virtual public vehicle{

public:
motorcar(){Seat=30;speed=200;} }
void run(){cout<<"car run"<<speed;}
void Stop(){speed=0;}
protected:
int Seat;
};

class motorcycl:public bicycl,motorcar{
public:
void run(){cout<<"motorcycl run"<<speed;}
void Stop(){speed=0;}
};
void main()
{ bicycl b;motorcar m;motorcycl mc;
b.Stop();cout<<b.speed<<endl;
m.Stop();cout<<m.speed<<endl;
mc.Stop();cout<<mc.speed<<endl;
}
另外你的题目要求说的不是很清楚啊，主函数要怎么用到这三个类呢？

Answer 2

大概写写
1、
class Mammal
{
public:
Mammal(float w,int a){weight=w;age=a;}
protected:
float weight;
int age;
};
class Dog:public Mammal{
public:
Dog(float w,int a,int c){weight=w;age=a;color=c;}
void print(){cout<<weight<<age<<c;}
protected:
int color;
};
void main()
{
Dog do1(2.4,2,23);
do1.print();
}

2\
class vehicle{
protected:
float MaxSpeed;
float speed; //当前速度，自己加的
public:
virtual void run(float s){speed=s;}
virtual void Stop(){speed=0;}
};
class bicycle:public vehicle{
protected:
float height;
public:
void seth(float h){height=h;}
void run(float s){cout<<"bicycle";speed=s;}
void Stop(){speed=0;}
};
class motorcat:public vehicle{
protected:
int Seat;
public:
void sets(int s){Seat=s;}
void run(float s){cout<<"car";speed=s;}
void Stop(){speed=0;}
};
class motorcycl:public bicycl,motorcar{

};
//虚基类和虚函数有点混淆，大概是这样，自己写写吧