Bob is an interactive AI. You can play games, use a calculator, and more!
I divided by zero
Exception in thread "main" java.lang.ArithmeticException: / by zero at Main.cal(Main.java:513) at Main.main(Main.java:228) exit status 1
Fun. You should have it give you a message is a user inputs something that isn't a valid command. For example, I entered '/game' and the system did nothing -- you could have it say something about not recognizing the command, then print the /help info again.