1.設計一個圓類circle和一個桌子類table，另設計一個圓桌類roundtable，它是從前兩個類派生出來的

要求輸出一個圓桌的高度，面積與顏色等。

#include<iostream>
#include<string>
using namespace std;
#define PI 3.14;
class circle
{
public:
    circle()
    {
        //預設建構函式
    }
    void setR(double r)
    {
        m_r = r;
    }
    double getR()
    {
        
 
return m_r;
    }
    double getArea()
    {
        double area;
        area = m_r *m_r * PI;
        return area;
    }
protected:
    double m_r;//圓的半徑
};

class table
{
public:
    table()
    {
        //預設建構函式
    }
    void setHigh(double high)
    {
        m_high = high;
    }
    double getHigh()
    {
        
 
return m_high;
    }
protected:
    double m_high;//桌子的高度
};

class  roundtable : public circle, public table
{
public:
    roundtable()
    {
        //建構函式

    }
    void setC(string color)
    {
        m_color = color;
    }
    string getC()
    {
        return m_color;
    }
private:
    string m_color;//
 
圓桌的顏色
};
int main()
{
    roundtable r1;
    r1.setR(2.0);
    r1.setHigh(1.3);
    r1.setC("紫色");
    cout << "圓桌的高為：" << r1.getHigh() << "米" << endl;
    cout << "圓桌的面積為：" << r1.getArea() << "平方米" << endl;
    cout << "圓桌的顏色為：" << r1.getC() << endl;
    system("pause");
    return 0;
}

2.定義描述矩形的類~~~~（題目略）

#include<iostream>
#include<string>
using namespace std;
class Rectangle
{
public:
    Rectangle() {}
    int CalArea()
    {
        int area;
        area = m_Length * m_Width;
        return area;
    }
    void setLength(int l)
    {
        m_Length = l;
    }
    int getLenght()
    {
        return m_Length;
    }
    void setWidth(int w)
    {
        m_Width = w;
    }
    int getWidth()
    {
        return m_Width;
    }
protected:
    int m_Length;
    int m_Width;
};

class Cuboid :public Rectangle
{
public:
    Cuboid(int l, int w, int h)
    {
        m_Length = l;
        m_Width = w;
        m_Chigh = h;
    }
    int CalVol()
    {
        m_Volume = m_Length * m_Chigh * m_Width;
        return m_Volume;
    }
    void Show()
    {
        cout << "長方體的長為：" << m_Length << endl;
        cout << "長方體的寬為：" << m_Width << endl;
        cout << "長方體的高為：" << m_Chigh << endl;
        cout << "長方體的體積為：" << CalVol() << endl;
    }
private:
    int m_Chigh;
    int m_Volume;
};

int main()
{
    Cuboid c1(10,20,30);
    c1.Show();
    system("pause");
    return 0;
}

執行截圖

3.定義一個車基類（題目略）

#include<iostream>
#include<string>
using namespace std;
class Vehicle
{
public:
    Vehicle(int ms, int mw)
    {
        m_MaxSpeed = ms;
        m_Weight = mw;
    }
    int getMaxSpeed()
    {
        return m_MaxSpeed;
    }
    int getWeight()
    {
        return m_Weight;
    }
    void Run()
    {
        cout << "車的最大速度為：" << m_MaxSpeed << endl;
        cout << "車的重量為：" << m_Weight << endl;
    }
    void Stop()
    {
        cout << "車輛停下" << endl;
    }
    ~Vehicle(){}
protected:
    int m_MaxSpeed;
    int m_Weight;
};
//虛基類的virtual可以寫在public前面，如
//virtual public Vehicle
//也可以寫在public後面
class bicycle :public virtual Vehicle
{
public:
    bicycle(int ms, int mw, int h) :Vehicle(ms, mw)
    {
        m_height = h;
    }
    int getHeight()
    {
        return m_height;
    }
    void Run()
    {
        cout << "自行車的高為：" << m_height << endl;
    }
    void Stop()
    {
        cout << "自行車已停下" << endl;
    }
    ~bicycle(){}
private:
    int m_height;
};

class Motorcar :public virtual Vehicle
{
public:
    Motorcar(int ms, int mw, int sn) :Vehicle(ms, mw)
    {
        m_SetNum = sn;
    }
    int getSetNum()
    {
        return m_SetNum;
    }
    void Run()
    {
        cout << "汽車的座位數為：" << m_SetNum << endl;
    }
    void Stop()
    {
        cout << "汽車已停下" << endl;
    }
    ~Motorcar() {}
private:
    int m_SetNum;
};

class motorcycle :public bicycle, public Motorcar
{
public:
    motorcycle(int ms, int mw, int h, int sn) :Vehicle(ms, mw), bicycle(ms, mw, h), Motorcar(ms, mw, sn)
    {

    }
    void Run()
    {
        cout << "這是motorcycle" << endl;
        cout << "速度為：" << getMaxSpeed() << endl;
        cout << "高度為：" << getHeight() << endl;
        cout << "重量為為：" << getWeight() << endl;
        cout << "座位數為：" << getSetNum() << endl;
    }
    void Stop()
    {
        cout << "motorcycle stopped" << endl;
    }
    ~motorcycle(){}
};

int main()
{
    Vehicle v1(10, 20);
    v1.Run();
    v1.Stop();
}