The area of a circle can be calculated using the formula: PI r 2 The volume of a

Question

The area of a circle can be calculated using the formula:   PI r2   The volume of a sphere can be calculated using the formula: (4/3) PIr 3  

PI = 3.141124 or can be generated using the Math.PI method.

r = the radius of a circle or sphere (distance between center and the perimeter)

Accept input for any number of entries (use a loop) for the radius of a circle or sphere.  Then, calculate the area of that circle and output the result to the screen.  Note:  Your program will accept input and then output a result in each iteration of the loop.

Your program will have at least six methods:

1.      The main method that outputs an introduction to the program.

2.      A method that prompts for and accepts input from the user.

3.      A method that calculates the area of the circle using the input from step 2.

4.      A method that calculates the area of a sphere using input from step 2.

5.      A method that outputs the result of both calculations.

a.       No output will exceed three decimal places.

6.      A method that thanks and says goodbye to the user just before the program terminates.

7.      As always, a program header, proper indentation and spacing, and adequate code comments are expect

Your program will end when the user enters a 0 for the radius of the circle.  

Here is a sample run of the assigned program:

Welcome to the Round Object Calculator

This program will calculate the area of a circle

     or the volume of a sphere.

The calculations will be based on the user input radius.

Enter C for circle or S for sphere:  S

Thank you.  What is the radius of the sphere (in inches): 45.9

The volume of a sphere with a radius of 45.9 inches is: 405066.816 cubic inches.

Do you want to calculate another round object (Y/N)? Y

Enter C for circle or S for sphere:  C

Thank you.  What is the radius of the circle (in inches): 15.86

The area of a circle with a radius of 15.86 inches is: 790.235 inches.

Do you want to calculate another round object (Y/N)? N

Thank you for using the Round Object Calculator.  Goodbye.

Welcome to the Round Object Calculator

This program will calculate the area of a circle

     or the volume of a sphere.

The calculations will be based on the user input radius.

Enter C for circle or S for sphere:  S

Thank you.  What is the radius of the sphere (in inches): 45.9

The volume of a sphere with a radius of 45.9 inches is: 405066.816 cubic inches.

Do you want to calculate another round object (Y/N)? Y

Enter C for circle or S for sphere:  C

Thank you.  What is the radius of the circle (in inches): 15.86

The area of a circle with a radius of 15.86 inches is: 790.235 inches.

Do you want to calculate another round object (Y/N)? N

Thank you for using the Round Object Calculator.  Goodbye.

Explanation / Answer

package menu;

import java.io.*;
import java.lang.*;
import java.util.*;
import java.text.*;

public class Menu
{  
    public static String s;
    public static char c;
    static Scanner inpu = new Scanner ( System.in );
   
    static public void welcome()
    {
        System.out.println("Welcome to the Round Object Calculator");
        System.out.println(" This program will calculate the area of a circle");
        System.out.println("or the volume of a sphere.");
        System.out.println("The calculations will be based on the user input radius. ");
    }
   
    static public void end() throws IOException
     {
         System.out.println("Thank you for using the Round Object Calculator. Goodbye. ");
     }
   
    static public void out(double x,double y,int a) throws IOException
    {
        DecimalFormat f = new DecimalFormat("##.000"); // this will helps you to always keeps in two decimal places
        if(a==1)
        System.out.println("The area of a circle with a radius of "+x +"inches is:" + f.format(y)+"square inches.");
        else
        System.out.println("The volume of a sphere with a radius of "+x +"inches is:" + f.format(y)+"cubic inches.");
               
    }
   
    static public void cir(double x)throws IOException
    {
        double PI = 3.141124;
        double y = x * x * PI;
        out(x,y,1);
    }
   
    static public void sph(double x)throws IOException
    {
        double PI = 3.141124;
        double y = x * x * x * PI * 4;
        y = y/3.0;
        out(x,y,2);
    }
  
    static public void input()throws IOException
    {
        System.out.println("Enter C for circle or S for sphere: S");
        s = null;
        c = (char)System.in.read();
        double x;
        if(c == 'C' || c=='c')
        {
            System.out.println("Thank you. What is the radius of the circle (in inches):");
            s = inpu.next();
            x = Double.parseDouble(s);
            cir(x);
        }
        else if(c == 'S' || c=='s')
        {
            System.out.println("Thank you. What is the radius of the sphere (in inches):");
            s = inpu.next();
            x = Double.parseDouble(s);
            sph(x);
        }
       
    }
   
    public static void main(String[] args) throws IOException
    {
        welcome();
        input();
        System.out.println("Do you want to calculate another round object (Y/N)? ");
        c ='y';
        while(true)
        {
            c = (char) System.in.read();
            if(c=='N' || c=='n')
               break;
            input();
        }
        end();
    }
}

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