In member function 'int Time::toSecond()',
    inlined from 'void Time::addsecond(int)' at /in/foo.cc:21:23,
    inlined from 'int main()' at /in/foo.cc:34:16:
/in/foo.cc:10:36: warning: 't.Time::second' is used uninitialized [-Wuninitialized]
   10 |         return hour*3600+minute*60+second;
      |                                    ^~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:33:10: note: 't' declared here
   33 |     Time t(hour,minute,second);
      |          ^