Assignment #1 Factorial Approximation

CMSC 203

Assignment #1

Concepts tested by this program:

          Set up and run java, javac, and an IDE (Eclipse) on your computer

          Create a class

          main method

          variables

          constants

          mathematical operators

          assignment operator

          conditional statements

          logical operators

          input/output

          Eclipse IDE

Specifications
A useful approximation to the value of n! for large values of n is given by Sn = e-nnn+(1/2)       

Develop a Java application in a class named FactorialApproximation that prompts for and reads one integer numeric amount that represents the value of n for n!.   Use the approximation formula to calculate n!.

Requirements

·         Use at least 2 named constants in your code

·         Display a header for your application.

·         Ask the user for the value of n.

·         Restrict the values of n to whole numbers that are greater than 0 and less than 100.  Any value that is outside this range should cause the program to end after an error message is printed.

·         If the value of n is in the proper range, calculate the estimated value of n!

·         Display the approximation of n! that results, with an appropriate label.

·         If the value of n is equal to 5 or 7, compare the actual value of 5!, or 7!, to the value calculated by the formula.  Then print the difference (actual value - calculated value) with an appropriate label.

·         Display your name as programmer at the end.

·         Use the Scanner class for input, and use System.out.print or System.out.println for output.

·         Your program must use the single class FactorialApproximation and only one static void main method.

·         Your code must not use loops, return statements, System.exit(), arrays or collections.

Design

·         “Think before you code”

·         Design your application using pseudo-code

·         Create a set of test cases that show the expected output of at least three normal cases, one that should produce an error message, and a “boundary case”.

·         Record your pseudo-code and test cases in a Word or PDF document.

 

To Deliver

·         Week 1: Submit your initial design (pseudo-code and test cases) in Blackboard.

·         Week 2: Run the application twice, and turn in screen shots of both runs in Blackboard.

·         Run it once using command-line Java (javac to compile, and java to run). Your screen shot should show both compilation and execution. If your computer cannot find the javac or java commands, see the lecture slides explaining how to set the path for Java.

·         Run it again using an Integrated Development Environment (IDE). The one used in class will be Eclipse. Provide a screen shot of the console output. See the lecture slides explaining how to download and install Eclipse.

·         Turn in your final design (pseudo-code and test cases) based on your study of the “approved solution” design.

·         Turn in your Design Reflection, a text document how you modified your initial design based on the approved solution, or why you did not modify it.

·         Turn in the working java file FactorialApproximation.java (not the .class file).

 

Example screen shots:



 



 

 

 

·         Upload two .zip files for each assignment.  The first .zip file will contain all the files required for the assignment (final design with pseudocode and table of test cases, screen shot of runs, design reflection document and the .java file, and will be named: LastNameFirstName_AssignmentX.zip. 

·         The second .zip file will only contain the .java files and will be named: LastNameFirstName_AssignmentX_Moss.zip.  This .zip will not have any folders in it – only .java files.

 

Here’s an example for Assignment 1:

AlexanderRobert_Assignment1.zip [a compressed file containing the following]

                        PseudoCode_and_TestTable.docx

                        CmdLine_output.jpg

                        Eclipse_console_output.jpg

                        Design Reflection.docx

                        FactorialApproximation.java

 

AlexanderRobert_Assignment1_Moss.zip [a compressed file containing only the following]

                        FactorialApproximation.java

 

 

 

 


Grading Rubric

CMSC 203 Project #1

 

Name _____________________________      

 

PROGRAMMING                                                                                      

     Compiles                                                                                                                                                                            40 pts _____

     Accuracy                                                                                                   

            Passes test cases                                                                                                                                                          15 pts _____

        Passes private instructor tests                                                                                                                     15 pts _____        

     Execution: runs without errors (either run-time or logic errors)                                         30 pts _____

Possible Sub-total                                                                                                                               100 pts _____

 

REQUIREMENTS  (Subtracts from Programming total)

Documentation:

     Screen shot of console run was not provided                                                                                           - 5 pts _____

     Screen shot of IDE run was not provided                                                                                                - 5 pts _____

     Documentation within source code was missing or incorrect                                                        - 5 pts _____           

       

Programming Style:

     Incorrect use of indentation, statements, structures                                                                                   - 5 pts _____ 

     User interface

            Not clear to user how data is to be entered; UI does not follow requirements          - 10 pts _____

            Output is easy to understand                                                                                                                            - 5 pts _____

Design:

     Implementation does not follow design                                                                                                     - 5 pts _____

     Does not define a class named FactorialApproximation                                                                - 5 pts _____

     Does not print header                                                                                                                                                           - 5 pts _____

     Does not print programmer name                                                                                                               - 5 pts _____

     Does not use at least 2 named constants                                                                                                    - 5 pts _____

Possible decrements:                                                                                                               -60 pts _____

 

Possible total grade:                                                                                                                             100 pts _____