Chapter 6.2, Problem 5E

(General math) a. The volume, V, of a cylinder is given by this formula:

$V=\pi r^{2}L$

r is the cylinder’s radius, and L is its length. Using this formula, write a C++ function named cylvol() that accepts a cylinder’s radius and length and returns its volume.

b. Include the function written in Exercise 5a in a working program. Make sure your function is called from main() and returns a value to main() correctly. Have main() use a cout statement to display the returned value. Test the function by passing various data to it.