/in/foo.cc: In function 'int IsLeapYear(int)':
/in/foo.cc:33:30: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  if(year%400==0 || year%4==0 && year%100!=0)
                    ~~~~~~~~~~^~~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:70:11: warning: unused variable 'month' [-Wunused-variable]
  int year,month,d;
           ^~~~~
/in/foo.cc:70:17: warning: unused variable 'd' [-Wunused-variable]
  int year,month,d;
                 ^