/in/foo.cc: In member function 'int Date::DaysinYear(const Date&)':
/in/foo.cc:69:24: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   if (date2.month >= 3 && (date2.year % 4 == 0 && date2.year % 100 != 0) || (date2.year % 400 == 0))
       ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~