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06/22/2009 at 08:58AM PDT, ID: 24511613
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9.1

How to calculate the distance of speed

Asked by gkilgore in New to Java Programming

Tags: java

I need someone to critque the attached program.  The program is support to ask the user to enter Air, Water or Steel and the distance that sound wave will travel.  The program should also display the amount of time it will take to travel using the following formula:

Air : time = distance / 1100
Water: time = distance / 4900
Steel: time = distance / 16400

I feel that an if statement should be included, but not really sure.  
Also, my program changed the formula, which may be incorrect.

Any assistance provided will be appreciated. 
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import java.util.Scanner;
import javax.swing.JOptionPane;
import java.text.DecimalFormat;
 
 
public class Switch
{
	public static void main(String[] args)
	{
		String input;
		char medium;
		double Air = 00.00;
		double Water = 00.00;
		double Steel = 00.00
		double Time = 00.00;
		double distance = 00.00;
		
			Scanner keyboard = new Scanner(System.in);
		
			System.out.println("Enter A for air, W for water and S for steel:");
			
			DecimalFormat formatter = new DecimalFormat("0.00");
 
					
		input = keyboard.nextLine();
		medium = input.charAt(0);
		
		input = JOptionPane.showInputDialog("Enter distance of air ");
		Air = Double.parseDouble(input);
		
				Air = Air / 1100;
 
		input = JOptionPane.showInputDialog("Enter water ");
		Water = Double.parseDouble(input);
		
				Water = Water / 4900;
		
		input = JOptionPane.showInputDialog("Enter steel ");
		Steel = Double.parseDouble(input);
		
				Steel = Steel / 16400;
 
		switch(medium)
		{
			case 'a':
			case 'A':
				System.out.println("Rate of Air " + Air);
				break;
			case 'w':	
			case 'W':
				System.out.println("Rate of Water " + Water);	
				break;
			case 's':	
			case 'S':
				System.out.println("Rate of Steel " + Steel);
				break;
			default:
				System.out.println("Invalid choice. ");
		}
	}
}
 
Keywords: How to calculate the distance of speed
Title
1 diggin to china
 
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[+][-]06/22/09 09:28 AM, ID: 24684030

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[+][-]06/22/09 09:45 AM, ID: 24684164

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About this solution

Zone: New to Java Programming
Tags: java
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Solution Provided By: mwvisa1
Participating Experts: 2
Solution Grade: A
 
 
[+][-]06/22/09 10:00 AM, ID: 24684305

At Experts Exchange, members can ask their questions to thousands of technology professionals, also known as Experts. Experts compete and collaborate to answer those questions by leaving comments like this one.

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