C++: Write a program that determines whether the user entered an item number in the required format: three digits, a hyphen, two digits, a hyphen followed by 4 alphanumerics. Display an appropriate message indicating whether the format is correct or incorrect. Use a sentinel value of -1 to end the program.  You must use at least two functions in the solution of this exercise.

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Types of Function

A function is a process or task that does some operation in the program. Some programming languages may contain built-in functions for certain commonly used tasks. Most programming languages also support user-defined functions, which means a user can write their own function to perform some operation. There are some libraries or header files that contain built-in functions for performing certain tasks.