Rules;

Employee class should be abstract.

All inherited class must implement calculateSalary() and register() methods!

These methods can print method names. Do not think/worry about their implementation details. Keep simple.

You can implement these functions in Employee class if it makes sense.

Each class should have an overloaded operator (<<) in order to print name and salary of the object.

Do not worry about syntax errors.

What is wrong with this overloaded insertion operator (<<)? Explain and create an interface class (as we did in the course) and provide functionality so all employees are printable to an ostream using the overloaded insertion operator.