/in/foo.cc: In function 'int main()':
/in/foo.cc:7:10: warning: right operand of comma operator has no effect [-Wunused-value]
  cin>>x,y;
          ^
/in/foo.cc:8:11: warning: 'y' is used uninitialized in this function [-Wuninitialized]
  cout<<x<<y;
           ^