/in/foo.cc: In function 'int year(int)':
/in/foo.cc:5:15: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
 return (y%4==0&&y%100!=0||y%400==0)?1:0;
         ~~~~~~^~~~~~~~~~
/in/foo.cc: In function 'int year3(int, int, int, int, int, int)':
/in/foo.cc:26:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^