C++ Code Help

Problem: Create a program that will calculate the volume and surface area of a cone using a function other than main.

Your program will contain two functions other than main: one to check the validity of the entered dimensions and one to calculate the volume and surface area of the cone.

Your function to check the validity of entered dimension should be a value-returning function that accepts two parameters: one a double for the dimensions and one a string for what the dimension represents (such as radius of cone or height of cone).

The function should return a valid value to the function call. Your second function should be a void function that will calculate the volume and surface, then send these values back to the function call. Do not use the same identifiers for variables in multiple functions! Carefully choose which parameters should be passed by reference and which should be passed by value.