COMP 110 Fall 2007

Description

Write a GUI-based program that mimics a calculator. The program should take as input two floating-point numbers and the operation to be performed. It should then output the numbers, the operator, and the result (formatted to two decimal places).

The user input should be in the format operand1 operator operand2, where the operands and the operator are separated by spaces. For example, to add 2 and 3, the user should enter 2 + 3 in the text field of the dialog box.

You should support the following operations: addition (+), subtraction (-), multiplication (*), division (/), and exponent (^). Since the user will enter floating-point numbers, you do not have to support the mod (%) operator.
Note: operand1 ^ operand2 means that operand1 should be raised to the operand2(th) power.

Special cases to handle:

Here's an example run:

What to Turn in

• Your prog2_onyen.jar file (where onyen is your Onyen), which includes your Calculator.java source file
• short write-up of questions you had and/or problems you encountered while doing this assignment

• Follow the directions for completing programming assignments.
• Name your Java source file Calculator.java and your class Calculator.

When I runs/examines your program, it must satisfy the following requirements. The maximum point value for each is shown in brackets.

1. [5] Your class, Java source file, and Jar file must be appropriately named (as specified above).
2. [10] You must use the JOptionPane class to create dialog boxes for user input and output. Your user input dialog box should contain instructions for using the program, including a list of the supported operations.
3. [10] You must display the correct result of the calculation to the user.
4. [10] If the user attempts to divide by 0, you must print a message to that effect (e.g., "division by 0 not allowed").
5. [10] If the user enters an invalid operator, you must print a message to that effect (e.g., "operation not supported").
6. [10] You must format the result of the calculation to two decimal places.
7. [10] You must use meaningful variable names, which conform to the style guidelines and Java naming convention discussed in class.
8. [10] You must comment your code, including block-like multi-line comments and single-line comments where appropriate. In addition, your code must be neatly and clearly formatted using appropriate "white space."

• If your program doesn't compile or run (i.e., has a syntax error), you will receive 0 credit for the items listed above in bold (so, at most 25/75 points).
• Remember that an implicit requirement for all assignments is that your code must include (at the top) the standard program header with pledge, and your signed pledge must be on file.