Assignment 2: Guide – SWE 619 – ALL – Spring 2010

Goal: Basic familiarity with Java Exceptions.

Basic Assignment

1 // Fig. 13. 1: DivideByZeroNoExceptionHandling.java

2 // An application that attempts to divide by zero.

3

4

5 public class DivideByZeroNoExceptionHandling

6 {

7 // demonstrates throwing an exception when a divide-by-zero occurs

8 public static int quotient( int numerator, int denominator )

9 {

10 return numerator / denominator; // possible division by zero

11 } // end method quotient

12

13 public static void main( String args[] )

14 {

15

16

17 // Provide an implementation to input the numerator, input the denominator

18 // call the quotient method, and output the result

19

20

21

22

23

24

25 } // end main

26 } // end class DivideByZeroNoExceptionHandling

Assignment:

1) Implement the above code fragment completing the main section based on the comment.

2) Compile and execute bullet one with several test cases including a denominator = 0; Save the output to file.

3) Augment the implementation in bullet one as follows:

a. Write a requires clause that addresses a denominator = 0;

b. Modify the implementation in bullet one to check for denominator = 0; make sure you prevent and provide the caller program with mechanism to recover from when the denominator = 0;

c. Modify the implementation in bullet one to address the case with denominator = 0 by using an exception

Submit the following:

1) Provide Java source files for all four implementations.

2) Provide output files for all four implementations (include several valid and invalid test cases)