When you are finished with this assignment, you will have $36$ user$-$input validation functions that you can use for years to come when writing other programs!

All features possible must be tested for each function. These functions are meant to get input from the user, validate it$,$ and return it; nothing more. Therefore, none of these functions may display any message or values other than the original message and a request to try again. Remember, cin knows what data type it's trying to read and will return an error if the data type is wrong, so there's no need to read data as a string and parse it yourself. You must provide function prototypes for every function.

Put the $36$ functions created in parts $1-5$ into one file. Put prototypes for all functions at the beginning of this file. Copy$/$paste this file into your report ONCE. Create separate programs for questions $1-6$ and copy$/$paste EACH of these programs into your report with the appropriate test plans.