Using C++,

Write a program that determines whether the user entered an item number in the required format: three digits, a hyphen, and two digits. Display an appropriate message indicating whether the format is correct. Use a sentinel value to end the program.

Hint: Use substr

Sample Run Item number (e.g. 123-45 or X or x to end): abc Incorrect format. Item number (e.g. 123-45 or X or x to end): abc-de Incorrect format. Item number (e.g. 123-45 or X or x to end): 123 Incorrect format. Item number (e.g. 123-45 or X or x to end): 12345 Incorrect format. Item number (e.g. 123-45 or X or x to end): 123-45 Correct format. Item number (e.g. 123-45 or X or x to end): x