//DoDivision.java
//Introduces the "throws" keyword.

import java.util.Scanner;

public class DoDivision
{
   private int numerator;
   private int denominator;
   private double quotient;

   public static void main(String[] args)
   {
        DoDivision doIt = new DoDivision();
        try
        {
            doIt.doNormalCase();
        }
        catch(DivideByZeroException e)
        {
            System.out.println(e.getMessage());
            doIt.giveSecondChance();
        }
        System.out.println("End of Program.");
    }

    public void doNormalCase() throws DivideByZeroException
    {
        System.out.print("\nEnter numerator: ");
        Scanner keyboard = new Scanner(System.in);
        numerator = keyboard.nextInt();
        System.out.print("Enter denominator: ");
        denominator = keyboard.nextInt();
        if (denominator == 0) throw new DivideByZeroException();
        quotient = numerator / (double)denominator;
		System.out.println(numerator + "/" + denominator + 
						   " = " + quotient);
   }

   public void giveSecondChance()
   {
        System.out.println("\nTry Again:");
        System.out.print("Enter numerator: ");
        Scanner keyboard = new Scanner(System.in);
        numerator = keyboard.nextInt();
        System.out.print("Enter denominator and be sure ");
        System.out.print("it is not zero: ");
        denominator = keyboard.nextInt();
        if (denominator == 0)
        {
            System.out.println("I cannot do division by zero.");
            System.out.println("Since I cannot do what you want,");
            System.out.println("the program will now end.");
            System.exit(0);
        }
        quotient = ((double)numerator) / denominator;
		System.out.println(numerator + "/" + denominator + 
						   " = " + quotient);
    }
}