/in/foo.cc: In function 'int main()':
/in/foo.cc:11:3: warning: 'k' is used uninitialized in this function [-Wuninitialized]
  k++;
  ~^~
/in/foo.cc:10:3: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
  x/=10;
  ~^~~~