Sophomore Java Homework-P5.34

/**
 * Name: Method practice - The frustum of a cone
 * @author LinChuWen
 * Date: 2014.10.22
 *
 * NCHU EE,course number:2335
 * course name: Object Oriented Language
 * Textbook: Big Java:Late Objects-Cay S. Horstmann
 * Problem: P5.34
 * Description: Compute the volume and surface area of the frustum of a cone.
 */
import java.util.*;
import java.lang.Math;
public class HW4_P5_34 {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);

        System.out.print("Please enter \"first radius\" (R1): ");
        double R1 = input.nextDouble();

        System.out.print("Please enter \"second radius\" (R2): ");
        double R2 = input.nextDouble();

        System.out.print("Please enter \"height\" (h): ");
        double h = input.nextDouble();

        System.out.println("volume = " + volume(R1,R2,h));
        System.out.println("surface area = " + surfaceArea(R1,R2,h));

        input.close();
    } //main end

    private static double volume( double R1,double R2,double h){
        double volume = (1.0/3) * Math.PI * h * (R1*R1 + R2*R2 + R1*R2);
        return volume;
    } //voulme() end

    private static double surfaceArea( double R1,double R2,double h){
        double surfaceArea = Math.PI * ((R1+R2) * Math.sqrt(Math.pow(R2-R1, 2) + h*h) + R1*R1);
        return surfaceArea;
    } //surfaceArea() end

} //class end