PRASHNIKAप्रश्निका
‹ Back to the paper

An interface Shape is defined with a method area() which returns the area of the implementing…

Computer Science20205 marksProgram
An interface Shape is defined with a method area() which returns the area of the implementing shape. Create the classes Circle and Rectangle which implement the interface Shape. These classes have attributes which reflect their dimensions (radius for a circle, height and width for a rectangle) which are set by their constructors. The details of the members of the interface and both the classes are given below: Interface name : Shape Member functions/methods: double area() : returns the area of the implementing shape Class name : Circle Data members/instance variables: radius : to store radius of the circle in decimal Member functions/methods: Circle(int r) : parameterized constructor to initiallize radius=r double area() : to calculate area of the circle [ area of a circle is $3.14 * radius * radius$ ] Class name : Rectangle Data members/instance variables: length : to store length of the rectangle in decimal breadth : to store breadth of the rectangle in decimal Member functions / methods: Rectangle(int l, int b) : parameterized constructor to initialize length=l, breadth=b double area() : to calculate area of the rectangle [ area of a rectangle is $length * breadth$ ] Assume that the Interface Shape has been defined. Using the concept of inheritance, specify the classes Circle and Rectangle giving details of their constructors and double area() respectively. The interface, main function and algorithm need NOT be written.

Answer

No answer yet.

Inheritance, Interfaces and Polymorphism

From ISC 2020 Specimen Computer Science Paper 1, question 10.