/in/foo.cc: In function 'int main()':
/in/foo.cc:13:22: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
         if(year%4==0 && year%100!=0 || year%400==0)
            ~~~~~~~~~~^~~~~~~~~~~~~~
/in/foo.cc:16:15: warning: 'days' may be used uninitialized in this function [-Wmaybe-uninitialized]
     cout<<days;
               ^