/in/foo.cc: In function 'int main()':
/in/foo.cc:30:15: warning: 'days' may be used uninitialized [-Wmaybe-uninitialized]
   30 |         cout<<days;
      |               ^~~~
/in/foo.cc:5:17: note: 'days' was declared here
    5 |         int y,m,days;
      |                 ^~~~