/in/foo.cc: In function 'int main()':
/in/foo.cc:7:17: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
     if(year%4==0&&year%100!=0||year%400==0)
        ~~~~~~~~~^~~~~~~~~~~~~
/in/foo.cc:9:5: warning: this 'else' clause does not guard... [-Wmisleading-indentation]
     else
     ^~~~
/in/foo.cc:11:2: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'else'
  return 0;
  ^~~~~~