Decimal point input

To process real-valued input from the keyboard, we just need to use a different method. As we would suspect, the method is called nextDouble. Let’s use the method in a program that computes the volume of a sphere given the radius (it’s just ). We will prompt the user to enter the radius as a double value. Here’s the complete program:

// this program will compute the volume of a sphere given its radius

import java.util.Scanner;

public class SphereVolume

{

public static void main(String args[])

{

// Create a Scanner object ‘input’

Scanner input = new Scanner(System.in);

// prompt the user to enter the radius as a real value

System.out.print("Enter the radius: ");

// store the result in ‘radius'

double radius = input.nextDouble();

// compute the volume and store in 'volume' (a double)

double volume = (4.0 / 3.0) * 3.141592654 * radius;

// display the result

System.out.println("The volume of a sphere with a radius of " + radius + " is " + volume);

}

}