COMP 14-090 Summer I 2000

Description

Write a program that implements a simple calculator. This calculator should be able to add, subtract, multiply, and divide two numbers. It should also be able to determine the minimum and maximum values given two numbers. Use the SimpleCalculator class you developed in your groups on Tuesday. You must use methods in solving this assignment. Prompt the user for two numbers, then display the results of each operation to the user. The user interface (i.e. what prompts you use and how you format the output) is up to you. The only requirement is that the results of the operations should be rounded to two decimal places.

What to Turn In

• A printout of your Java source code.
• A disk with your Java source code (SimpleCalculator.java) and bytecode (SimpleCalculator.class).
• An image of the output window. Make sure you see "==> End of job" before you capture the image. (You may include the output window image in the same document as your memo instead of turning in a separate printout of the output window.)
• A memo describing the problem and your solution of it. Include any problems you encountered or comments you may have about the assignment. Also, include an estimate of the total amount of time you spent working on this assignment.
• Your disk should contain the following files:
  • SimpleCalculator.java      your Java source code
  • SimpleCalculator.class    your Java bytecode

Steps to Follow

1. Follow the instructions in Getting Started with Visual J++ under "Creating a New Project."  Use Assignment3 as your project name.
2. Follow the instructions under "Adding a New Class."  Name your class SimpleCalculator.
3. Enter or copy the text of the program outline from the course web page (SimpleCalculator.java under "Sample Code"). To copy from the web, bring up the web page, select Select All from the Edit menu. Then select Copy from the Edit menu. Then go back to the Visual J++ program text window and select Select All from the Edit menu and then select Paste from the Edit menu. That should put the program text into your Visual J++ window.
4. Fill in your name, program description, input, and output.
5. Build and run your program to make sure you copied everything correctly. It should just print out
   "==> End of job" and wait for you to hit Enter.
6. Replace the comments "// Insert your code here" with your code to solve the problem given above.
7. Save often!

Notes

• Test your program with various numbers as input. The program should not crash or report errors when given valid numerical inputs.
• Don't forget to comment your program! If there are no comments, you will lose at least 25% of the points.
• Don't forget to virus check and label your disk according to the instructions in Turning in Assignments on Disk.
• Don't forget to sign the pledge on the printout of your source code.
• Extra credit will be given for programs that include a loop. (This will only count if we go over loops on Wednesday.)

The following output window is just an example (including extra credit). You don't have to use the same formatting. To get black text on a white background, I pasted the captured image into the Paint program and inverted the colors.

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