foo.cc: In function 'int IsLeapYear(int)':
foo.cc:53:30: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  if(year%400==0 || year%4==0 && year%100!=0)
                    ~~~~~~~~~~^~~~~~~~~~~~~~
foo.cc: In function 'int main()':
foo.cc:98:11: warning: unused variable 'month' [-Wunused-variable]
  int year,month,d;
           ^~~~~
foo.cc:98:17: warning: unused variable 'd' [-Wunused-variable]
  int year,month,d;
                 ^

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