Q7: When a user is asked to input one digit, how can you test to make sure that a user entered only one? Assuming the user's input is stored in a variable named, digit, write the code that displays an...

Extracted text: Q7: When a user is asked to input one digit, how can you test to make sure that a user entered only one? Assuming the user's input is stored in a variable named, digit, write the code that displays an appropriate error message. NOTE: Be sure to test for positive and negative values.