10. User-defined type

• C++ programmer describes user-defined types using keyword class:

  
  #include <iostream>
  
  class Date {
      // member variables
      int serial_date;
  public:
      // member functions
      void set_date( int month, int day, int year );
      int get_month();
      int get_day();
      int get_year();
  };
  
  int main()
  {
      Date birthday; // instantiate object of type "Date"
      birthday.set_date( 2, 8, 1999 ); // member function calls
      std::cout << birthday.get_month();
      return 0;
  }