/in/foo.cc: In member function 'int Date::difference(Date&)':
/in/foo.cc:32:29: error: no matching function for call to 'Date::pass()'
   32 |                 int num=pass();
      |                         ~~~~^~
/in/foo.cc:24:13: note: candidate: 'int Date::pass(int, int, int)'
   24 |         int pass(int y,int m,int d){
      |             ^~~~
/in/foo.cc:24:13: note:   candidate expects 3 arguments, 0 provided
/in/foo.cc:33:43: error: 'y' was not declared in this scope
   33 |                 for(int i=year-1;i>d.year;y--){
      |                                           ^
/in/foo.cc:36:31: error: no matching function for call to 'Date::YearDay()'
   36 |                 num+=d.YearDay()-d.pass();
      |                      ~~~~~~~~~^~
/in/foo.cc:21:13: note: candidate: 'int Date::YearDay(int)'
   21 |         int YearDay(int y){
      |             ^~~~~~~
/in/foo.cc:21:13: note:   candidate expects 1 argument, 0 provided
/in/foo.cc:36:40: error: no matching function for call to 'Date::pass()'
   36 |                 num+=d.YearDay()-d.pass();
      |                                  ~~~~~~^~
/in/foo.cc:24:13: note: candidate: 'int Date::pass(int, int, int)'
   24 |         int pass(int y,int m,int d){
      |             ^~~~
/in/foo.cc:24:13: note:   candidate expects 3 arguments, 0 provided
/in/foo.cc: In function 'int main()':
/in/foo.cc:43:26: error: found ':' in nested-name-specifier, expected '::'
   43 |         cin>>y2>>m2>>day2:
      |                          ^
      |                          ::
/in/foo.cc:43:22: error: 'day2' is not a class, namespace, or enumeration
   43 |         cin>>y2>>m2>>day2:
      |                      ^~~~
/in/foo.cc:46:29: error: 'd1' was not declared in this scope; did you mean 'd2'?
   46 |         cout<<d2.difference(d1)<<end;
      |                             ^~
      |                             d2