/in/foo.cc: In function 'int main()':
/in/foo.cc:6:9: warning: 'x' is used uninitialized in this function [-Wuninitialized]
  int xx=x;
         ^
/in/foo.cc:16:3: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
   if(xx==y)
   ^~