Static Data Members
	//static data member declaration (class interface) class class_name {    ...    static data_type static_data_member;    ... }; • A static data member's definition must be supplied only once and is usually placed in the class implementation file. A static data member's definition must be preceded by the class name and the scope resolution operator before the static data member's identifier. //static data member definition (class implementation) data_type class_name::static_data_member = initial_value;