Error Handling

When you create an application, there are certain unknown elements. For example, if the users tries to save the current file which is on a floppy, and the floppy is not inserted when your application attempts to access it, your application will crash and you would lose any unsaved information. Error handling intercepts these errors, so you can give the user a useful error message, instead of your application crashing. i.e. instead of getting a message "Err 45 Disk not ready" and then the application crashing, you could change your code so that the user would get the message "Please insert a floppy disk into Drive A", and then give the user an option to retry or cancel.