Concept explainers
Write the declaration for class B. The class’s members should be as follows:
• m: an integer. This variable should not be accessible to code outside the class or to member functions in any class derived from class B.
• n: an integer. This variable should not be accessible to code outside the class, but should be accessible to member functions in any class derived from class B.
• setM, getM, setN, and getN: These are the set and get functions for the member variables m and n. These functions should be accessible to code outside the class.
• cal c: a public virtual member function that returns the value of m times n.
Next, write the declaration for class D, which is derived from class B. The class’s members should be as follows:
• q: a float. This variable should not be accessible to code outside the class but should be accessible to member functions in any class derived from class D.
• r: a float. This variable should not be accessible to code outside the class, but should be accessible to member functions in any class derived from class D.
• setQ, getQ, setR, and getR: These are the set and get functions for the member variables q and r. These functions should be accessible to code outside the class.
• calc: a public member function that overrides the base class calc function. This function should return the value of q times r.
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