/in/foo.cc: In function 'int main()':
/in/foo.cc:8:7: warning: unused variable 'x1' [-Wunused-variable]
  {int x1=x%10;
       ^~
/in/foo.cc:11:2: warning: 'y' is used uninitialized in this function [-Wuninitialized]
  if(x==y)
  ^~
/in/foo.cc:9:4: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
   x=x/10;
   ~^~~~~