The IRLE notes that blue collar and manual workers can be replaced for an average cost of $2,000, while the average cost for managerial and professional employees may be as high as $7,000.
By defining a Node * typedef, it is assured that all the variables will be structure pointer types, or say, that each variable is a pointer type pointing to a structure type.
The Keyboard class is used to build an interface that can be controlled by a user with a standard keyboard. You can use the methods and properties of the Keyboard class without using a constructor. The properties of the Keyboard class are constants representing the keys that are most commonly used to control games.