/in/foo.cc: In function 'int main()':
/in/foo.cc:9:13: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   if(i%4==0 && i%100!=0 || i%400==0)
      ~~~~~~~^~~~~~~~~~~
/in/foo.cc:12:8: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<c<<endl;
        ^