/in/foo.cc: In function 'int main()':
/in/foo.cc:8:14: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  if(year%4==0&&year%100!=0||year%400==0)
     ~~~~~~~~~^~~~~~~~~~~~~
/in/foo.cc:10:2: warning: this 'else' clause does not guard... [-Wmisleading-indentation]
  else
  ^~~~
/in/foo.cc:12:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'else'
   if(month==4||month==6||month==9||month==11)
   ^~