/in/foo.cc: In member function 'int Date::Pass()':
/in/foo.cc:38:32: error: 'YearMonthDay' was not declared in this scope
   38 |                         num += YearMonthDay(year,m1);
      |                                ^~~~~~~~~~~~
/in/foo.cc: In member function 'int Date::Pass(int, int, int)':
/in/foo.cc:45:32: error: 'YearMonthDay' was not declared in this scope
   45 |                         num += YearMonthDay(y,m1);
      |                                ^~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:61:19: error: 'class Date' has no member named 'daysBetween'
   61 |     cout << date1.daysBetween(date2) << endl;
      |                   ^~~~~~~~~~~