foo.cc: In function ‘int main()’:
foo.cc:10:20: warning: ‘x’ may be used uninitialized [-Wmaybe-uninitialized]
   10 |                 x=x*10+s%10;
      |                   ~^~~
foo.cc:5:15: note: ‘x’ was declared here
    5 |         int n,x,s=0;
      |               ^