/in/foo.cc: In member function 'void Date::JS()':
/in/foo.cc:15:35: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  int flag=(year%400==0||year%4==0 && year%100!=0);
                         ~~~~~~~~~~^~~~~~~~~~~~~~
/in/foo.cc:45:35: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
      flag=(year%400==0||year%4==0 && year%100!=0);
                         ~~~~~~~~~~^~~~~~~~~~~~~~
/in/foo.cc:32:2: warning: 'nn' may be used uninitialized in this function [-Wmaybe-uninitialized]
  if(mun+day<=nn)
  ^~