On my last assignment (MathOP2) the professor said that the program should not include any UI's. Is there an easy way to fix this?

For this week's he wants this done to the MathOP2 application

• Modify the prior application to include try catch finally block.
• You need to explain where you implemented the try catch block and why? (Hint you can implement the try catch on the test program level, super class level or the sub class level).
• Create a test program to demonstrate your work (Hint; add text to numbers and/or divide by zero).