Complete any one of the following projects

1. (Hardest) If not done last week, upgrade the previous version GPA calculator to handle variable credit + and - grades. Provide error checking.
2. Complete the quadratic equation calculator. Handle imaginary numbers as per example slides. Also use try catch to handle input data format exceptions.
3. Complete the hand calculator project from week 2.  You should now be able to add functionality to the operator keys.
4. Build an application that allows the user to enter a file name. Open the file and display file contents (numbers) in a listbox. Also sum the contents and display this sum.
5. Complete either the base 10 to base b or base b to base 10 converter, but handle bases up to 16.