getInputFile(): File 1. Loop until the path given is for file that exists a. Prompts user for the input file path b. If no file is given (user presses enter) then use the default path name (C:/train/customer-data.txt) C. Use given path to create File instance d. Checks if file exists. e. If file does not exist gives an error message and loop until correct path is entered. 2. Return File instance