/in/foo.c: In function 'main':
/in/foo.c:19:25: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
      case 2:if(year%4==0&&year%100!=0||year%400==0)
                ~~~~~~~~~^~~~~~~~~~~~~
/in/foo.c:24:8: warning: 'days' may be used uninitialized in this function [-Wmaybe-uninitialized]
     day+=days;}
     ~~~^~~~~~