1. Programming Assignment #5
Professor Hugh C. Lauer CS-2303, System Programming Concepts
(Slides include materials from The C Programming Language, 2nd edition, by Kernighan and Ritchie, Absolute C++, by Walter Savitch, The C++ Programming Language, Special Edition, by Bjarne Stroustrup, and from C: How to Program, 5th and 6th editions, by Deitel and Deitel)
CS-2303, A-Term 2012
Programming Assignment #5

2. Programming Assignment #5
Define and develop a class of rational numbers
Overloaded operators for manipulating them
+, –, *, /, ==, !=, <, <=, >, >=
Overloaded << and >> operators for reading in from or writing out to streams
Overloaded assignment operator to assign to a double
A copy constructor, a default constructor, and two other constructors
To make rational numbers from integers
Create a test program to exercise this rational class.
Scan in numbers and operations
Execute them
Print out the result in rational format and as a double
CS-2303, A-Term 2012
Programming Assignment #5

3. What is a rational number
A number comprising two integers
Numerator and denominator
(Denominator may not be zero)
Represent both as int
I.e., 32-bit in Intel processors
Do internal arithmetic in long long int
i.e., 64-bit in Intel processors
Always normalize!
CS-2303, A-Term 2012
Programming Assignment #5

4. You may NOT refer to them! Programming Assignment #5
Notes
There are many rational classes available on the web and in print.
You may NOT refer to them!
You must design and implement your own class and your own operators
You may work alone or in two-person teams
Project due at 11:59 PM, Sunday, September 30
CS-2303, A-Term 2012
Programming Assignment #5

5. Programming Assignment #5
Test program
Command line arguments are one or more text files
Each text file is a sequence of lines
Each line consists of rational numbers of the form a/b c/d, etc., and operators such as +, -, *, /, ==, etc.
All operations are expressed in postfix — e.g.,
1/6 1/3 +
1/4 1/ *
3/4 6/8 ==
Result should be 1/2
Result should be 3/4
Result should be true
CS-2303, A-Term 2012
Programming Assignment #5

6. Test Program (continued)
An arbitrary number of test files
Each file an arbitrary number of lines
Each line an arbitrary number of rational numbers and operations
CS-2303, A-Term 2012
Programming Assignment #5

7. Programming Assignment #5
Test cases
As many as you need to exercise your class
… and test all operations different ways
… using number with non-trivial denominators — including
Denominators that are relatively prime
Denominators that are large but not relatively prime
CS-2303, A-Term 2012
Programming Assignment #5

8. Programming Assignment #5
Questions?
CS-2303, A-Term 2012
Programming Assignment #5