foo.cc: In function ‘int main()’:
foo.cc:26:15: warning: ‘xx2’ may be used uninitialized [-Wmaybe-uninitialized]
   26 |         cout<<xx2;
      |               ^~~
foo.cc:5:25: note: ‘xx2’ was declared here
    5 |         int n,x1,x2,xx1,xx2;
      |                         ^~~