/in/foo.c: In function 'main':
/in/foo.c:23:23: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    case 2:if(year%4==0&&year%100!=0||year%400==0)
              ~~~~~~~~~^~~~~~~~~~~~~
/in/foo.c:29:7: warning: 'd' may be used uninitialized in this function [-Wmaybe-uninitialized]
   days+=d;
   ~~~~^~~