/in/foo.cc: In function 'int main()':
/in/foo.cc:20:6: warning: statement has no effect [-Wunused-value]
   x*x-200; 
   ~~~^~~~
/in/foo.cc:26:10: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout <<y;
          ^