create a C$++$ program that will calculate the volume of a cone. The program should have the following four functions:

One function that will ask the user to enter an integer between $1$ and $30,$ inclusive, as the radius and return the radius. If the radius is not between $1$ and $30,$ the program will ask the user to enter another radius. The function only returns a number between $1$ and $30.$ Name the function as radius$()$

One function that randomly generates a number between $7$ and $20,$ inclusive, and returns the random number. Name the function as height$()$

One function, named volume$(),$ that takes the radius and height from the functions radius$()$ and height$()$ respectively, as arguments and calculates the volume of a cone using the formula:

volume $=(1/3)*$ PI $*$ radius$2*$ height

The PI value should be declared as a constant global variable with value $3\mathrm{.}1416.$

The function returns the calculated volume as a float or double number.

One function that prompts the result is

The volume of a cone with radius of $\_\_\_$cm and a height of $\_\_\_\_$cm is $\_\_\_\_\_$cm$^3$