/in/foo.cc: In member function 'bool Date::isLeapYear(int)':
/in/foo.cc:9:33: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    9 |         return (y%400==0||y%4==0&&y%100!=0);
      |                           ~~~~~~^~~~~~~~~~
/in/foo.cc: In member function 'int Date::leftday(int, int)':
/in/foo.cc:13:26: error: cannot convert 'Date::isLeapYear' from type 'bool (Date::)(int)' to type 'bool'
   13 |             if(isLeapYear){
      |                          ^