// Fig. 13.2: DivideByZeroWithExceptionHandling.java
// An exception-handling example that checks for divide-by-zero.
import java.util.InputMismatchException;
import java.util.Scanner;

public class DivideByZeroWithExceptionHandling
{
   // demonstrates throwing an exception when a divide-by-zero occurs
   public static int quotient( int numerator, int denominator )
      throws ArithmeticException
   {
      return numerator / denominator; // possible division by zero
   } // end method quotient

   public static void main( String args[] )
   {
      Scanner scanner = new Scanner( System.in ); // scanner for input
      boolean continueLoop = true; // determines if more input is needed

      do
      {
         try // read two numbers and calculate quotient
         {
            System.out.print( "Please enter an integer numerator: " );
            int numerator = scanner.nextInt();
            System.out.print( "Please enter an integer denominator: " );
            int denominator = scanner.nextInt();

            int result = quotient( numerator, denominator );
            System.out.printf( "\nResult: %d / %d = %d\n", numerator,
               denominator, result );
            continueLoop = false; // input successful; end looping
         } // end try
         catch ( InputMismatchException inputMismatchException )
         {
            System.err.printf( "\nException: %s\n",
               inputMismatchException );
            scanner.nextLine(); // discard input so user can try again
            System.out.println(
               "You must enter integers. Please try again.\n" );
         } // end catch
         catch ( ArithmeticException arithmeticException )
         {
            System.err.printf( "\nException: %s\n", arithmeticException );
            System.out.println(
               "Zero is an invalid denominator. Please try again.\n" );
         } // end catch
      } while ( continueLoop ); // end do...while
   } // end main
} // end class DivideByZeroWithExceptionHandling


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