/in/foo.cc: In function 'int main(int, const char**)':
/in/foo.cc:123:9: warning: unused variable 'year' [-Wunused-variable]
     int year,month,day;
         ^~~~
/in/foo.cc:123:14: warning: unused variable 'month' [-Wunused-variable]
     int year,month,day;
              ^~~~~
/in/foo.cc:123:20: warning: unused variable 'day' [-Wunused-variable]
     int year,month,day;
                    ^~~