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What prints out at the end of the invalid input messages that shows what causes the program to exit?
Invalid Entry ???????

Sorry, I don't know anything about DrJava.

What prints out for the invalid input that causes the program to exit?
Invalid Entry ???????

what value of input is causing the code to execute the System.exit()? Add the variable at the end of the println() so it is printed out.

Can you copy the full contents of the console window from...

I still see lots of if and else statements that do NOT have the following statements enclosed in {}s.

I don't know. Are the compiler errors fixed now?

Post your current code if you have questions about it.

The compiler thinks that the else is misplaced and should be removed.

Did you see the following?

One problem I see with the code is there are some if statements that do NOT have {}s following...

The compiler often only finds one error at a time because that error hides the next error(s). A missing ) is a big deal and needs to be fixed so the rest of the tokens can be properly placed.
...

I think this is the key part of the message. The compiler thinks there should be a ) at the indicated location.
Check the code for properly pairing of ( and ) and see why the compiler thinks there...