/in/foo.cc: In function 'int main()':
/in/foo.cc:25:25: warning: 'f1' may be used uninitialized [-Wmaybe-uninitialized]
   25 |         cout << (f1 / f2) ;
      |                         ^
/in/foo.cc:6:13: note: 'f1' was declared here
    6 |         int f1 , f2 ;
      |             ^~
/in/foo.cc:25:25: warning: 'f2' may be used uninitialized [-Wmaybe-uninitialized]
   25 |         cout << (f1 / f2) ;
      |                         ^
/in/foo.cc:6:18: note: 'f2' was declared here
    6 |         int f1 , f2 ;
      |                  ^~