Calculating area of triangle and rectangle using multiple inheritance in C++

 #include <iostream>

using namespace std;

class Shape {

protected: int l,b,a;

public: void getData() {

cout<<"Enter the value of l and b:";

cin>>l>>b;

}

};

class Triangle: public Shape{

public: void display(){

a=(l*b)/2;

cout<<"Area of triangle:"<<a;

}

};

class Rectangle:public Shape{

public:

    void display(){

    a=l*b;

    cout<<"Area of Rectangle:"<<a;

    }

};

int main()

{

    Rectangle rectangle;

    Triangle triangle;

    rectangle.getData();

    triangle.getData();

    rectangle.display();

    cout<<endl;

    triangle.display();

    return 0;

}