get_yes_or_no

get_yes_or_no(prompt,default) displays a prompt and reads a response from standard input. If the response is 'y', 'yes', 'Y', or "yes", a value of 1 is returned. If the response is 'n', 'no', 'N', or 'NO', a value of 0 is returned. If the user types 'quit' or 'exit', the program is stopped. If the user does not provide input and the optional default argument is present, the default value is returned. If none of these conditions is satisfied, an error message is generated and the prompt is displayed again.