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For a language to be classified as object-oriented it must also provide inheritance and polymorphism. Inheritance is the capability to derive one class from another. A derived class is a completely new data type that incorporates all of the data member and member functions of the original class with any new data and functions members unique to itself. The class used as the basis for the derived type is referred to as the base or parent class and the derived data type is referred to as the derived or child class.A derived class has the same form as any other class in that it consists of both a declaration and an implementation. The only difference is in the first line of the declaration section. For a derived class this line is extended to include an access specification and a base class name has the form class derived-class-name class-access base-class-nameTo illustrate the concept of inheritance we will derive a Box class from a base class Rectangle. The following program listing is the implementation of the two classes.
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#include iostream.h#include math.hconst double PI = .0 asin(1.0);class Circle{ protected
double radius; public
Circle(double = 1.0);
double area( );};CircleCircle(double r){ radius = r; }double Circlearea( ){ return (PIradiusradius); }class Cylinder public Circle { protected double length; public Cylinder (double r = 1.0, double l = 1.0);
double area ( ); };CylinderCylinder(double r, double l ){ radius = r; length = l;}double Cylinderarea( ){ return (lengthCirclearea()); }int main ( ){ Circle circle_1, circle_ (); Cylinder cylinder_1(,4);cout The area of circle_1 is circle_1.area(); cout The area of circle_ is circle_.area();cout The volume of cylinder_1 is
cylinder_1.area(); circle_1 = cylinder_1;cout The area of circle_1 is now
circle_1.area() endl endl; return 0;}Run the above program and try to understand the concept behind it.Q1. Create a base class named Point that consists of an x and y coordinates as data member. From this class derive a class named Circle having an additional data member named radius. For this derived class the x and y data members represent the center coordinates of a circle. The function members of the base class should consists of a constructor, an area function named area() that return zero, and a distance() function that returns the distance between a point and the origin. Also, the derived class should have a constructor and an override function named area() that returns the area of a circle. Include the class implementation in a working C++ program. Q. Create a base class named Rectangle that contains length and width data members. From this class derive a class named Box having additional data members named depth. The function members of the base Rectangle class should consist of a constructor and an area function. The derived Box class should have a constructor, a volume function, and an override function named area that returns the surface area of the box. Include the class constructed above in a working C++ program.Q. Create a class named Investment that holds data about initialAmount, currentValue, and profit. Investment class has member functions setData() to set the data for the initialAmount and currentValue. Profit is calculated and set as the difference of the above two variables and showData() to show the data of all the investment details. Create another class called House that contains data members for the street address of a House(address), square feet of the house(squareFeet), and number of bed rooms(numBedrooms). This class also has member functions setData() to set the data for the data members and showData() to display the data of house information.Derive a class named HouseAnInvestment from both Investment and House class. It has a constructor that takes the five arguments. In this constructor, address, squareFeet, and numBedrooms are passed to the House class setData() function and intialAmount, and currentValue are passed to the Investment class setData() function. Also, the derived class should have showHouse() function that employs its own specialized code and uses the existing, inherited showData() functions from the Investment and House classes. This function distinguishes between a good and bad investment by the presence of profit. Add a main() that declares objects of HouseAnInvestment class. One object is to show the investment is good and another is to show the investment is bad. Include the all the classes and functions in a C++ program.Typical OutputInvestment Data on HouseInvestment Current Value RM 15Investment Initial Value RM 150000Profit RM The house at 4 BANDAR DAMANSARA has bedrooms and 000 square feet of living area.This house was a good investment.Investment Current Value RM 1500Investment Initial Value RM 10000Profit RM -500 (Loss)The house at 4 Jalan Gombak has bedrooms and 100 square feet of living area.This house was a bad investment.
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