/in/foo.cc: In function 'int main()':
/in/foo.cc:34:15: warning: 'd' may be used uninitialized [-Wmaybe-uninitialized]
   34 |         cout<<d;
      |               ^
/in/foo.cc:8:13: note: 'd' was declared here
    8 |         int d;
      |             ^