/in/foo.cc: In function 'bool leap(int)':
/in/foo.cc:6:14: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  if(year%4==0&&year%100!=0||year%400==0) return true;
     ~~~~~~~~~^~~~~~~~~~~~~
/in/foo.cc: In function 'int month(int)':
/in/foo.cc:17:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^