This question has been posted here before, but I need a slightly more detailed answer. So here goes. I am working on a project that is, basically, an atm simulation. The part I'm having problems with (at the moment) is the PIN number. For this exercise, the pin has to be any 4 digit number. Meaning, the program won't be looking for a specific number, but rather any number with 4 digits. Any suggestions on how to do this?