CSCI251/851 Advanced Programming Exercise 4


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You are to implement a class called Rational for performing arithmetic with fractions. It uses integer
variables to represent a fractional number in the private data of the class – i.e. the numerator and the
denominator. (e.g. the fraction 2/4 should be stored in a Rational object as 2 in the numerator and 4 in
the denominator). Your code should go in files: rational.h and rational.cpp. A driver program is
provided in main.cpp.
Implement a default constructor, a standard constructor and a copy constructor. The default constructor
should initialize the class to 0/1. Also, implement public member functions for doing the following:
• Addition of two Rational numbers.
• Subtraction of two Rational numbers.
• Multiplication of two Rational numbers.
• Division of two Rational numbers.
• Printing Rational numbers in the form a/b where a is the numerator and b is the denominator.

An incomplete class declaration is provided in rational.h. The member function definitions should go
in rational.cpp. main.cpp is setup to test your step-1 functions.
Implement a standalone (non-class) function:
void printRationalAsFloating(const Rational &r);
for printing the passed Rational number as a floating point number. Note: for this to work you will
have to make this function a friend function to class Rational. Modify the main() function to test this
Implement a private static class data member named Count for maintaining a count of the number of
instances of class Rational that exist. This can be done by simply incrementing and decrementing
Count in the constructors and destructor respectively. Also provide a static class member function for
accessing the static Count data member. Modify your main() procedure to test this static function.
Provide exception handling to prevent division by zero. Your program should throw a string exception
to anywhere where divide by zero can happen. You should catch this exception in the main() following
the tests. The exception handler should print an appropriate error message and exit(). Modify you
main to test the exception handler.
Submit your files using the submit facility on UNIX as shown below:
$ submit -u login -c CSCI251 –a ex4 main.cpp rational.h rational.cpp
where ‘login’ is your UNIX login ID
Note: CSCI851 should also submit to –c CSCI251.
You must also demonstrate your program in your week 11 lab class. Failure to demo on time, without
being granted an extension, will result in a 1 mark deduction for each week late. Late submissions
without granted extension will receive a deduction of 0.5 marks for each day late.