we wish the user to enter a single digit, we may wish to prompt

multiple times in order to arrive at a valid input. Use the prompts shown in the sample

output below to arrive at a valid digit input.

get$\_$digit Function:

Input variables:

$$ none

Output variables:

$$ a scalar value representing a single digit

A possible sample case is:

$>>$ digit $=$ get$\_$digit$()$

Enter a digit: pi

Invalid input. Enter a digit: $-1$

Invalid input. Enter a digit: $10$

Invalid input. Enter a digit: $5$

digit $=5$

$5$