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# Assignment 3 Skills Using Inheritance

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CSC 230 Elementary Data Structures and Algorithms
– Assignment 3

Assignment 3 Skills
Using Inheritance
Understanding Polymorphism
Understanding Class design
Using an Interface to define behaviors for a class
Assignment 3 Background
For this assignment, you will write several classes that model different types of sequences.
Recall:
1. An arithmetic sequence is a sequence that has a constant difference between terms. Given the first
term and the constant difference, you can find any term in the sequence.
2. A geometric sequence is a sequence that has a constant ratio between terms. Given the first term
and the constant ratio, you may find any term in the sequence.
3. The Fibonacci sequence is a sequence where each term in the sequence is the sum of the two terms
that precede it. The first two terms in the Fibonnaci sequence are 0 and 1.
*We will create a generalized Fibonacci sequence*
Assignment 3 Requirements
1. (10%) Write an interface called SequenceOps. This interface will define behavior for objects that
have sequential properties. This interface should have the following methods defined:
(a) A method that gets the nth term in a sequence. This method requires a parameter for n and
returns the nth term.
(b) A method that sums the first n terms in the sequence. This method requires a parameter for n
and returns the sum of the first n terms.
2. (15%) Write an abstract class called Sequence. This class defines properties and methods that
all sequences will have. This class must implement the SequenceOps interface. This class should
include the following:
(a) a private field for the first term in the sequence, type: double.
(b) a default constructor that sets the first term to 1.
(c) a constructor that sets the first term using a parameter value.
(d) A method that returns the first term in the sequence.
(e) A toString method that returns a String of the first 10 terms in a sequence in a comma
delimited list.
3. (15%) Write a class called ArithmeticSequence that extends the Sequence class and implements
the SequenceOps interface. This class should include the following:
(a) a private field for the common difference.
(b) a default constructor that initializes the first term to 1 and the common difference to 0.
(c) a constructor that uses parameters to initialize the common difference and the first term.
4. (15%) Write a class called GeometricSequence that extends the Sequence class and implements the
SequenceOps interface. This class should include the following:
(a) a private field for the common ratio.
(b) a default constructor that initializes the first term to 1 and the common ratio to 1.
(c) a constructor that uses parameters to initialize the common ratio and the first term.
5. (15%) Write a class called FibonacciSequence that extends the Sequence class and implements the
SequenceOps interface. This class should include the following:
(a) a private field for the second term.
(b) a default constructor that initializes the first term to 0 and the second term to 1.
(c) a constructor that uses parameters to initialize the the first and second terms.
6. (20%) Write a main method in a file called SequenceTest.java. Your main method should:
(a) Create a Sequence variable
(b) Read from the input file SEQ.dat, which is formatted as follows:
i. The first item on a line is a letter that represents the type of sequence (A, G, or F).
ii. the second item on a line is a double value that represents the first term in the sequence.
iii. the thrid item on a line is a double value that represents either the common difference,
common ratio, or second term, depending on the type of sequence.
(c) Use toString and other methods to produce the output in the following format (for each line
of input):
i. Print to standard out: ‘The first 10 terms in the sequence are:’
ii. Print to standard out a comma-delimited list of the first 10 terms.
iii. Print to standard out: ‘The sum of the first 5 terms =’ the sum of the first 5 terms.
7. (10%) Provide comments where appropriate
Assignment 3 Restrictions
1. (-10) Do not use any reference variables for ArithmeticSequence, GeometricSequence,
or FibonacciSequence. Use only a single Sequence variable in you main method.
2. (-10) Do not override toString method in ArithmeticSequence, GeometricSequence,
or FibonacciSequence class.
3. (-5) The toString method must return a String and cannot print to standard out. All printing
should be done in the main method.
4. (-10) Do not use recursion.
Assignment 3 Submission Submit on Blackboard:
1. SequenceOps.java
2. Sequence.java
3. ArithmeticSequence.java
4. GeometricSequence.java
5. FibonacciSequence.java
6. SequenceTest.java
Required Each submitted file should include your name and a statement that this is your own work. This
should appear as a comment at the beginning of any code file.

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