/in/foo.cc: In function 'bool isLeapyear(int)':
/in/foo.cc:7:18: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
  if(((n%4==0)&&(n&100!=0))||(n%400==0))return 1;
                  ^
/in/foo.cc:7:25: warning: 'and' of mutually exclusive equal-tests is always 0
  if(((n%4==0)&&(n&100!=0))||(n%400==0))return 1;
                         ^