Q 1:
Create a base class called Shape with two double type data members x,y and two member functions
get_data() which takes two arguments to initialize the data members and display_area() to compute
and display the area of shapes. Derive two specific classes called Triangle and Rectangle from the base
class Shape. Make display area() as a virtual function and redefine this function in the derived classes
to compute and display the area of shapes.
Using these three classes, design a program that will accept sides of a triangle or a rectangle
interactively, and display the area of the shapes.
Answers
Answer:
/*Create a base class Shape .Use this Class to store two double type values that could
be used to compute areas. Add two derived Class Triangle and Rectangle from the
base Class Shape. Add to the base class, a member functions get_data () to
initialize the data members in the base class and add another member function
display_area () to compute the area. Declare this member function as virtual. Write
a C++ program to implement the class that accepts dimensions and calculate area.
(RUN TIME POLYMORPHISM).*/
// by Aniruddha
class Shape
{
public: double a,b;
void get_data ()
{
cin>>a>>b;
}
virtual void display_area () = 0;
};
class Triangle:public Shape
{
public: void display_area ()
{
cout<<"Area of triangle "<<0.5*a*b<<endl;
}
};
class Rectangle:public Shape
{
public: void display_area ()
{
cout<<"Area of rectangle "<<a*b<<endl;
}
};
int main()
{
Triangle t;
Shape *st = &t;
cout<<"Enter base and altitude: ";
st->get_data();
st->display_area();
Rectangle r;
Shape *sr = &r;
cout<<"Enter length and breadth: ";
sr->get_data();
sr->display_area();
return 0;
}
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Explanation:
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