// Page 231-232

import java.util.Scanner;
public class TwoCatchesDemo
{
	public static double exceptionalDivision
	(double nume, double deno) throws DividedByZeroException
	{
		if(deno == 0)
			throw new DividedByZeroException();
		return nume/deno;
	}
	public static void main(String[] args)
	{
		Scanner input = new Scanner(System.in);
		try
		{
			System.out.print("Enter # of widgets: ");
			int widgets = input.nextInt();
			if(widgets < 0)
				throw new NegativeNumberException("widgets");
			System.out.print("How many are defective: ");
			int defective = input.nextInt();
			if(defective < 0)
				  throw new NegativeNumberException
					("defectvie widgets");
			double ratio = exceptionalDivision
					(widgets, defective);
			System.out.println("One in every " +
				ratio + " widgets is defective.\n\n\n");
		}
		catch(NegativeNumberException e)
		{
			System.out.println("Can't have a negative number of " + e.getMessage());
		}
		catch(DividedByZeroException e)
		{
			System.out.println("Cong! A perfect record!");
		}
		System.out.println("End of program.\n\n\n");
	}
}