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:5:19: note: ‘x’ was declared here
    5 |         int n,s=0,x;
      |                   ^