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

import java.io.*; import java.util.*; import java.lang.*; public class Circle{ private double radius; public double pi = 3.14159; public Circle() {    this.radius = 0.0; } public Circle( double r) {    this.radius =r; } public void setRadius(double r) {    this.radius=r; } public double getRadius() {    return this.radius; } public double getArea() {    return pi*radius*radius; } public double getDiameter() {    return 2*radius; } public double getCircumference() {    return 2*pi* radius; } public static void main(String args[]){ System.out.print("Enter the Radius for the Circle: "); double r=0.0; try{    r= Double.parseDouble (new BufferedReader(newInputStreamReader(System.in)).readLine()); } catch (Exception e){    e.printStackTrace(); } Circle c = new Circle(r); System.out.println(" The area of the Circle with radius  " + r + "   is   " + c.getArea()); System.out.println(" The diameter of the Circle withradius   " + r + "   is   " +c.getDiameter()); System.out.println(" The circumference of the Circle withradius   " + r + "   is   " +c.getCircumference()); }//end of main } //end of Circle class

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.