Unable to output unsigned char/char in hex

[Arthur Schwarz <aschwarz1309@xxxxxxx>]

The code (below) is an output example. Hex output occurs for all the numeric 
types but not for unsigned char/char. Does hex only work for numeric values, and 
how do I force hex output? cout.setf(ios::hex) does not work.

[code]

using namespace std;

# include <string>
# include <iostream>
# include <iomanip>

int main(int argc, char** argv) {
   static const string msg[] = { "r[0] +=   "
                               , "r[1] -=   "
                               , "r[2] *=   "
                               , "r[3] /=   "
                               , "r[4] %=   "
                               , "r[5] <<=  "
                               , "r[6] >>=  "
                               , "r[7] &=   "
                               , "r[8] |=   "
                               , "r[9] ^=   "
                               };
   static char const  a = 254;
   char   x = 3;
   char   r[] = { a, a, a, a, a, a, a, a, a, a};
   r[0] +=  x;
   r[1] -=  x;
   r[2] *=  x;
   r[3] /=  x;
   r[4] %=  x;
   r[5] <<= x;
   r[6] >>= x;
   r[7] &=  x;
   r[8] |=  x;
   r[9] ^=  x;
   cout.setf ( ios::hex, ios::basefield );       // set hex as the basefield
   for (int i = 0; i < 10; i++) 
      cout << msg[i] 
           << " 0x"  << hex << setfill('0') << x 
           << "  0x" << hex << setfill('0') << r[i] << '\n';
}
[/code]
[output]
r[0] +=    0x  0x
r[1] -=    0x  0xû
r[2] *=    0x  0xú
r[3] /=    0x  0x
r[4] %=    0x  0xþ
r[5] <<=   0x  0xð
r[6] >>=   0x  0xÿ
r[7] &=    0x  0x
r[8] |=    0x  0xÿ
r[9] ^=    0x  0xý
[/output]