Exercise 3: Solve the programming exercise P9.9 on Page 490 on the book. Make a class Employee with a name and salary. Make a class Manager inherit from Employee. Add an instance variable, named...

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Extracted text: Exercise 3: Solve the programming exercise P9.9 on Page 490 on the book. Make a class Employee with a name and salary. Make a class Manager inherit from Employee. Add an instance variable, named department, of type string. Supply a method tostring that prints the manager's name, department, and salary. Make a class Executive inherit from Manager. Supply appropriate tostring methods for all classes. Supply a test program that tests these classes and methods.