/in/foo.c: In function 'main':
/in/foo.c:7:15: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   d=28+(y%4==0&&y%100||y%400==0);
         ~~~~~~^~~~~~~
/in/foo.c:8:2: warning: this 'else' clause does not guard... [-Wmisleading-indentation]
  else
  ^~~~
/in/foo.c:13:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'else'
   printf("%d\n",d);
   ^~~~~~