member variable representing the radius called radius and declared as a double with a default
value of 1.0. It also has a public function called calcVal that evaluates the area of a circle as PI *
radius * radius where PI is a constant 3.14.
In your derived class include an additional protected member representing the length of the
cylinder. Call this variable length. Have the default values for the cylinder class be 1 for both the
radius and the length. For this derived cylinder class include a public function calcVal that
evaluates the volume of the cylinder. (Hint: The volume of the cylinder is length * circle :: calcVal
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