foo.cc: In function ‘int main()’:
foo.cc:19:15: warning: ‘xi’ may be used uninitialized [-Wmaybe-uninitialized]
   19 |     cout<<xi<<' '<<x<<endl<<ni<<' '<<n<<endl;
      |               ^~~
foo.cc:8:34: note: ‘xi’ was declared here
    8 |         int x=-1000000,n=1000000,xi,ni;
      |                                  ^~
foo.cc:19:33: warning: ‘ni’ may be used uninitialized [-Wmaybe-uninitialized]
   19 |     cout<<xi<<' '<<x<<endl<<ni<<' '<<n<<endl;
      |                                 ^~~
foo.cc:8:37: note: ‘ni’ was declared here
    8 |         int x=-1000000,n=1000000,xi,ni;
      |                                     ^~