foo.cc: In function 'int main()':
foo.cc:13:10: warning: unused variable 'FirstDay' [-Wunused-variable]
   13 |      int FirstDay,year,month;
      |          ^~~~~~~~
foo.cc: In function 'int IsLeapYear(int)':
foo.cc:60:27: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   60 |  if(year%400==0||year%4==0&&year%100!=0)
      |                  ~~~~~~~~~^~~~~~~~~~~~~

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