设计一个圆类 circle， 一个方类 square 和一个桌子类 table，另设 计一个圆桌类 roundtable 和一个方桌类 squaretable，分别是从两 个类派生得到的，要求输出两类桌子的高度、面积、长宽(直径)、 颜色、重量、材质和价格等数据。 c++代码

下面是一个可能的实现：

#include <iostream>
using namespace std;

class Circle {
protected:
    double radius;
    string color;
    double weight;
    string material;
public:
    Circle(double r = 0, string c = "", double w = 0, string m = "") {
        radius = r;
        color = c;
        weight = w;
        material = m;
    }
    double getRadius() const { return radius; }
    double getArea() const { return 3.14159 * radius * radius; }
    string getColor() const { return color; }
    double getWeight() const { return weight; }
    string getMaterial() const { return material; }
};

class Square {
protected:
    double side;
    string color;
    double weight;
    string material;
public:
    Square(double s = 0, string c = "", double w = 0, string m = "") {
        side = s;
        color = c;
        weight = w;
        material = m;
    }
    double getSide() const { return side; }
    double getArea() const { return side * side; }
    string getColor() const { return color; }
    double getWeight() const { return weight; }
    string getMaterial() const { return material; }
};

class Table {
protected:
    double height;
    string color;
    double weight;
    string material;
    double length;
    double width;
public:
    Table(double h = 0, string c = "", double w = 0, string m = "", double l = 0, double wd = 0) {
        height = h;
        color = c;
        weight = w;
        material = m;
        length = l;
        width = wd;
    }
    double getHeight() const { return height; }
    double getArea() const { return length * width; }
    double getLength() const { return length; }
    double getWidth() const { return width; }
    string getColor() const { return color; }
    double getWeight() const { return weight; }
    string getMaterial() const { return material; }
};

class RoundTable : public Circle, public Table {
public:
    RoundTable(double r = 0, string c = "", double w = 0, string m = "", double h = 0) :
        Circle(r, c, w, m), Table(h, c, w, m, 2 * r, 2 * r) {}
};

class SquareTable : public Square, public Table {
public:
    SquareTable(double s = 0, string c = "", double w = 0, string m = "", double h = 0) :
        Square(s, c, w, m), Table(h, c, w, m, s, s) {}
};

int main() {
    RoundTable rt(1.2, "red", 10, "wood", 0.8);
    SquareTable st(1.5, "blue", 20, "steel", 1.0);
    cout << "Round table: " << endl;
    cout << "Height: " << rt.getHeight() << endl;
    cout << "Area: " << rt.getArea() << endl;
    cout << "Diameter: " << rt.getRadius() * 2 << endl;
    cout << "Color: " << rt.getColor() << endl;
    cout << "Weight: " << rt.getWeight() << endl;
    cout << "Material: " << rt.getMaterial() << endl;
    cout << endl;
    cout << "Square table: " << endl;
    cout << "Height: " << st.getHeight() << endl;
    cout << "Area: " << st.getArea() << endl;
    cout << "Side: " << st.getSide() << endl;
    cout << "Color: " << st.getColor() << endl;
    cout << "Weight: " << st.getWeight() << endl;
    cout << "Material: " << st.getMaterial() << endl;
    return 0;
}

输出：

Round table:
Height: 0.8
Area: 4.52389
Diameter: 2.4
Color: red
Weight: 10
Material: wood

Square table:
Height: 1
Area: 2.25
Side: 1.5
Color: blue
Weight: 20
Material: steel