Write a Circle class that has the followingmember variables: • radius : a double

Question

Write a Circle class that has the followingmember variables:

• radius: a double

• pi: a double initialized with the value3.14159

The class should have the following member functions:

• Default Constructor. A defaultconstructor that sets radius to 0.0.

• Constructor. Accepts the radius of thecircle as an argument.

• setRadius. A mutator function for theradius variable.

• getRadius. An accessor function for theradius variable.

• getArea. Returns the area of thecircle, which is calculated as

area = pi * radius * radius

• getDiameter. Returns the diameter ofthe circle, which is calculated as

diameter = radius * 2

• getCircumference. Returns thecircumference of the circle, which is calculated as

circumference = 2 * pi * radius

Write a program that demonstrates the Circleclass by asking the user for the circle’s radius, creating aCircle object, and then reporting thecircle’s area, diameter, and circumference.

Explanation / Answer

#include<iostream.h> #include<conio.h> double pi=3.14159;
class Circle { private:    double Radius; public:    Circle()//defualt constructor    {    Radius=0.0;    }    Circle(double radius)//defualtconstructor    {    Radius=radius;    }    void setRadius(double radius)    {    Radius=radius;    }    double getRadius()    {    return Radius;    }    double getArea (){    returnpi*Radius*Radius;    }    double getDiameter(){    return Radius*2;    }    double getCircumference()    {    return 2*pi*Radius;    }    };

main()    {    double radius;    cout<<"Enter the Radius ofCircle: ";    cin>>radius;    cout<<"---------------------------------";    Circle obj(radius);//creating object;    cout<<" Area ofCircle: "<<obj.getArea();    cout<<" Diameter ofCircle: "<<obj.getDiameter();    cout<<" Circumference ofCircle: "<<obj.getCircumference();    getch(); }

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