foo.cc: In function ‘int main()’:
foo.cc:14:9: warning: ‘month’ is used uninitialized [-Wuninitialized]
   14 |         if(month==2)
      |         ^~
foo.cc:12:34: note: ‘month’ was declared here
   12 |         int year,nowmonth,nowday,month,day,ans=0;
      |                                  ^~~~~