/in/foo.cc: In function 'int main()':
/in/foo.cc:10:9: error: 'xx' was not declared in this scope
   int x=xx,y=0;
         ^~
/in/foo.cc:14:5: error: 'y' was not declared in this scope
     y=y*10+x1;
     ^
/in/foo.cc:17:8: error: 'y' was not declared in this scope
  if(x==y)
        ^