/in/foo.cc: In function 'int main()':
/in/foo.cc:40:13: warning: 'days' may be used uninitialized [-Wmaybe-uninitialized]
   40 |     cout << days << endl;
      |             ^~~~
/in/foo.cc:9:9: note: 'days' was declared here
    9 |     int days;
      |         ^~~~