foo.cc: In function ‘int main()’:
foo.cc:12:17: warning: ‘x’ may be used uninitialized [-Wmaybe-uninitialized]
   12 |         cout<<n/x;
      |                 ^
foo.cc:5:15: note: ‘x’ was declared here
    5 |         int n,x;cin>>n;
      |               ^