/in/foo.c: In function 'main':
/in/foo.c:7:30: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  if(Year%400==0 || Year%4==0 && Year%100!=0)
                    ~~~~~~~~~~^~~~~~~~~~~~~~
/in/foo.c:27:2: warning: 'day' may be used uninitialized in this function [-Wmaybe-uninitialized]
  printf("%d",Day+day);
  ^~~~~~~~~~~~~~~~~~~~