Chapter 2 Question 2.2, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

(Compute the volume of a cylinder) Write a program that reads in the radius and length of a cylinder and computes the area and volume using the following formulas: 

area = radius * radius * π 

volume = area * length

Solution

import java.util.Scanner;

public class HelloWorld

{

    public static void main(String[] args)

    {

        // Create a Scanner object

        Scanner input = new Scanner(System.in);

        final double PI = 3.14159265359;

        // Prompt user to enter the radius and length of a cylinder

        System.out.print("Enter the radius and length of a cylinder: ");

        double radius = input.nextDouble();

        double length = input.nextDouble();

        // Calculate the area and volume

        double area = radius * radius * PI;

        double volume = area * length;

        // Display results

        System.out.println("The area is " + area);

        System.out.println("The volume is " + volume);

    }

}

OUTPUT

 

Enter the radius and length of a cylinder: 12 13

        The area is 452.38934211696

        The volume is 5881.06144752048