Question

C++
Please complete the implementation of the following source code (Question3.cpp). You need to add your code in the source code where the comment “// your code” locates. After you finish the implementation, please also provide the output of your program.

#include <iostream>

using namespace std;

class Shape
{
  protected:
        // your code
  public:
        void setWidth (int w)
        {
                // your code
        }
        void setHeight (int h)
        {
                // your code
        }
};

class Rectangle: public Shape
{
  public:
        int getArea ()
        {
                // your code
        }
};

class Triangle: public Shape
{
  public:
        int getArea ()
        {
                // your code
        }
};

int main (){

        Rectangle r;
        Triangle t;
        r.setWidth(1);
        r.setHeight(2);
        t.setWidth(3);
        t.setHeight(4);
        cout << r.getArea() << endl;
        cout << t.getArea() << endl;
        return 0;
}

Answer 1

#include <iostream>

using namespace std;

class Shape {
protected:
    int width, height;
public:
    void setWidth(int w) {
        width = w;
    }

    void setHeight(int h) {
        height = h;
    }
};

class Rectangle : public Shape {
public:
    int getArea() {
        return width * height;
    }
};

class Triangle : public Shape {
public:
    int getArea() {
        return (width * height) / 2;
    }
};

int main() {
    Rectangle r;
    Triangle t;
    r.setWidth(1);
    r.setHeight(2);
    t.setWidth(3);
    t.setHeight(4);
    cout << r.getArea() << endl;
    cout << t.getArea() << endl;
    return 0;
}