🚀 go-pugleaf

I apologize in advance for what is undoubtedly a very simple question
from a novice (myself).  I have a short program which compiles and
executes using CC (on my Sun Sparc2) but which I am unable to compile
using g++.  The program is:

#include <iostream.h>
main()
{
int index = 10;

   cout << "The hex value of index is " << hex << index << "\n";
}

The error message is:

g++ -g   -o test test.cc 
test.cc: In function `int  main ()':
test.cc:7: undefined ostream operator << ()

Why is it gagging on the "hex" manipulator (it works if I remove it),
and how do I correct it?  Please reply directly to me.  Thanks.

Troy Frever
troy@u.washington.edu