Unknown behaviour to me about "cout"ing unsigned chars

Question

The question is within the code.

#include <iostream>

int main()
{
   typedef unsigned char uchar;
   uchar u = ~uchar();

   // The following line, at least using gcc, prints: -1 �
   // The rvalue it's printed as a number, and the lvalue as a character.
   // What's the explanation of this behaviour for this particular type?
   std::cout << ~uchar() << ' ' << u << std::endl;

   return 0;
}