/in/foo.c: In function 'main':
/in/foo.c:18:12: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   if(y%4==0&&y%100!=0||y%400==0)
      ~~~~~~^~~~~~~~~~
/in/foo.c:20:3: warning: this 'else' clause does not guard... [-Wmisleading-indentation]
   else
   ^~~~
/in/foo.c:22:4: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'else'
    break;
    ^~~~~