/in/foo.cc: In function 'int main()':
/in/foo.cc:12:15: warning: 'n' may be used uninitialized [-Wmaybe-uninitialized]
   12 |         cout<<n;
      |               ^
/in/foo.cc:6:13: note: 'n' was declared here
    6 |         int n;
      |             ^