ROBOT.LK

Code: Select all

import javax.swing.JOptionPane;
public class convert
  {
  public static void main(String []args)
  {
    boolean loop = true;
    double meters;
    String choice;
    try {meters = Double.parseDouble(JOptionPane.showInputDialog("Enter a distance in meters"));}
    catch (Exception e) {meters = 500;} //try and catch is an exception that your prof will show you later.
    while (loop == true)
    {
      choice = menu();
      if (choice.equals("1"))
        showInches(meters);
      else if (choice.equals("2"))
        showFeet(meters);
      else if (choice.equals("3"))
        showKilometers(meters);
      else if (choice.equals("4"))
        loop = false;
      else
        JOptionPane.showMessageDialog(null, "Invalid choice!!!");
    }
   }
 //--------------------------------------------------------------------
   public static void showKilometers (double meters)
   {
     double kilometers;
     kilometers = meters * 0.001;
     System.out.println(meters + " are equal to " + kilometers);
   }
//--------------------------------------------------------------------
   public static void showInches (double meters)
   {
     double inches;
     inches = meters * 39.37;
     System.out.println(meters + " are equal to " + inches);
   }
//--------------------------------------------------------------------
   public static void showFeet (double meters)
   {
     double feet;
     feet = meters * 3.281;
     System.out.println(meters + " are equal to " + feet);
   }
//--------------------------------------------------------------------
   public static String menu()
   {
     String input ;
     input = JOptionPane.showInputDialog("1. Convert to inches \n2. Convert to feet \n3. Convert to kilometers \n4. End \nEnter Choice: ");
     return input;
   }
//--------------------------------------------------------------------
 }

Code: Select all

import java.io.*;


public class MeasurementConversion
{

	void showKilometers (double distance_in_m)
	{
		double distance_in_km = distance_in_m * 0.001;
		System.out.println(distance_in_m + " meters is " + distance_in_km + " kilometers\n\n");
	}
	
	
	void showInches (double distance_in_m)
	{
		double distance_in_inches = distance_in_m * 39.37;
		System.out.println(distance_in_m + " meters is " + distance_in_inches + " inches\n\n");
	}
	
	
	void showFeet (double distance_in_m)
	{
		double distance_in_feets = distance_in_m * 3.281;
		System.out.println(distance_in_m + " meters is " + distance_in_feets + " feets\n\n");
	}
	
	
	int menu()
	{
		int menu_input = 0;
		boolean valid;
		BufferedReader buff = new BufferedReader(new InputStreamReader(System.in));
		
		System.out.println("\n1. Convert to inches\n2. Convert to feet\n3. Convert to kilometers\n4. End\n");
		
		// take a valid input from menu
		do {
			try {
				System.out.println("\nEnter Choice: ");
				menu_input = Integer.parseInt(buff.readLine());
	
				if (menu_input <= 0 || menu_input > 4){
					System.out.println("\nInvalid entry (Type between 1 to 4)");
					valid = false;
				}
				else{
					valid = true;
				}
			}
			catch (Exception e) {
				System.out.println("\nInvalid entry");
				valid = false;
			}
		} while (!valid);
		
		return menu_input;
	}
	
	
	
	
	
	public static void main(String []args)
	{
		boolean loop = true;
		double distance_in_m = 0;
		boolean valid, cont = true;
		BufferedReader buff = new BufferedReader(new InputStreamReader(System.in));
		MeasurementConversion myCls = new MeasurementConversion();
		
		
		// loop until we get a valid input to distance then parse it as a double
		do {
			try {
				System.out.println("\nEnter a distance in meters: ");
				distance_in_m = Double.parseDouble(buff.readLine());
				if (distance_in_m >= 0){
					valid = true;
				}
				else{
					System.out.println("\nDistance can't be negative");
					valid = false; // negative inputs are invalid
				}
			}
			catch (Exception e) {
				System.out.println("\nInvalid Entry");
				valid = false;
			}
		} while (!valid);
		
		
		
		do {
		
			switch (myCls.menu()){ // take menu input
				case 1:
					myCls.showInches(distance_in_m);
					break;
				case 2:
					myCls.showFeet(distance_in_m);
					break;
				case 3:
					myCls.showKilometers(distance_in_m);
					break;
				case 4:
					cont = false;	// exit from loop
					break;
			}
		} while (cont);
	}
}