COSC 1P03 Assignment 3

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than 9, the ones digit of the sum is used for the corresponding digit in the result and a carry (of 1) is carried to the next digit position. Thus, at any digit position, the sum is of the corresponding digits plus the carry from the previous position (which is either 0 or 1). If there is a carry in the leftmost position, the result has an additional digit, being the carry. Subtraction Subtraction works much like addition. Starting at the ones position, the corresponding digits are subtracted. If the difference is non-negative, this is the digit of the result. If the difference is negative, a borrow (of 1) is borrowed from the next position and the digit of the result is the difference increased by 10. Again, at any position, the difference is the difference in the corresponding digits minus the borrow from the previous position (which is either 0 or 1). Since negative BigInt values are not supported, the second value should not be greater than the first and thus there cannot be a borrow in the leftmost digit position. Comparison Equality occurs if each digit in the corresponding digit positions are equal. Values with differing numbers of digits are unequal with the longer being the greater. With equal number of digits, the digits can be compared from the highest order position until unequal digits are encountered at which point the value with the smaller digit is the smaller. Multiplication and Division Multiplication and division can be implemented (not very efficiently) as repeated addition or subtraction, respectively. Testing To test your implementation, you must first create a .jar file from the Numbers package (Project/Create Jar File from Project) into the Numbers folder. Create a project in the Test folder with a class for testing ArrayBigInt. Import Numbers into this class, define variables using the BigInt type and create BigInt objects using ArrayBigInt constructors. Results of testing should be written to an ASCIIDisplayer. In your test project, add the .jar file in Numbers as an Extra Classpath (Project/Properties). Compile and run your test class to test your implementation. Marks will be awarded for quality of testing. Submission: Details regarding preparation and submission of assignments in COSC 1P03 are found on the COSC 1P03 website at URL: http://www.cosc.brocku.ca/Offerings/1P03/AssignGuide.pdf. This document includes a discussion of assignment preparation, programming standards, evaluation criteria and academic conduct (including styles for citation) in addition to the detailed assignment submission process copied below. Part of the marks for the assignment will be awarded for programming standards. To prepare and submit the assignment electronically from the lab, follow the procedure below: 1. Ensure your folder (say Assign3) for the assignment is stored on your Z: drive. 2. Print (to PDFCreator) the .java file of your ArrayBigInt class for the assignment using the name ArrayBigInt.pdf and save the .pdf file at the top level of the project folder (i.e. directly within Assign3).
3. Print (to PDFCreator) the .java file of your test class (see Testing above) for the assignment using the name Test.pdf and save the .pdf file at the top level of the project folder (i.e. directly within Assign3). 4. Run your test program and Save the image of the ASCIIDisplayer (File/Save Image of Window…) as TestOut.pdf at the top level (i.e. in the Assign3 folder). 5. In the RunBigInt project add the .jar file in Numbers as an Extra Classpath (Project/Properties). 6. Compile and Run the RunBigInt project. Save the image of the ASCIIDisplayer (File/Save Image of Window…) as Output.pdf at the top level (i.e. in the Assign3 folder). 7. Run PuTTY by selecting PuTTY under All Programs in the Start menu. 8. Double-click sandcastle in the Load, save … entry. 9. Enter your Brock userid and press the Enter key. 10. Once you have the sandcastle% prompt, navigate to your project directory for your assignment (say Assign3). Here are a few useful commands (press Enter after typing the command): ls –l cd - list files in current directory - changes to the specified subdirectory (note, do not include the ) e.g. cd Assign3 cd .. - go up 1 directory level Note: If your file or folder names include spaces or special characters, you have to enclose the name in quotes, e.g. cd ″COSC 1P03″. 11. Once you have confirmed you are in the correct project directory, type the command submit1p03 and follow the instructions. It is important to note that the script will copy everything from the current directory and its subfolders to the 1P03 electronic drop box. It is important you are in the correct directory when you run the script. The script will confirm what you have submitted. 12. Log off sandcastle by typing logout. For help in submitting an assignment from home see the COSC Help Center at URL: http://www.cosc.brocku.ca/help/esubmit. DrJava The folder from which you do the electronic submission should contain the project folder, including all files (including those supplied) relevant to the project—the .java and .class files for the assignment and .pdf files for program listings and output. Other platforms If you are using an IDE other than DrJava to prepare your assignment at home, you must copy your code into DrJava to create new project(s) and then compile and run and prepare the submission as above. Your electronic submission must only include DrJava project folders and the .pdf files as described.
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COSC 1P03 Assignment 3

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