Как выводить char в hex?

char ch = 't';
cout << hex << ch << endl;

cout << hex << (short)ch << endl;

unsigned int char_cast(unsigned char x)
{
    return x;
}
 
int main()
{
    char ch = '\xEF';
    std::cout << std::hex << char_cast(ch) << std::endl;
}

int main(int argc, char** argv) 
{
    char ch1 = 255;
    cout << hex << ch1 << "  " << (short)ch1 << endl;
    unsigned char ch2 = 255;
    cout << hex << ch2 << "  " << (short)ch2 << endl;
    cin.get();
    return 0;
}

#include "stdafx.h"
#include "scrypt.h"
#include <string>
#include <iostream>
using namespace std;
int _tmain(int argc, _TCHAR* argv[])
{
    std::locale::global(std::locale(""));
    const char  input[] = "hi";
    char  output[100];
    scrypt_1024_1_1_256("hi", output);
    std::cout << std::hex << output << std::endl;
    system("pause");
    return 0;
}

#include <iostream>
#include <iomanip>
 
struct hex_buf 
{
    char const * begin;
    char const * end;
};
 
hex_buf to_hex(char const * str, size_t len)
{
    return hex_buf{str, str + len};
}
 
std::ostream & operator <<(std::ostream & out, hex_buf const & x)
{
    out << std::hex;
    std::copy(x.begin, x.end, std::ostream_iterator<unsigned int>(out));
    return out;
}
 
int main()
{
    char buffer[100]={1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
    size_t len = 15;
    std::cout << to_hex(buffer, len) << std::endl;
}

#include <iostream>
#include <iomanip>
 
struct hex_view
{
    hex_view(unsigned char v) 
        : value(v) 
    { }
    unsigned int value;
};
 
std::ostream & operator<<(std::ostream & out, hex_view const & x)
{
    return out << std::setfill('0') << std::setw(2) << x.value;
}
 
struct hex_buf 
{
    char const * begin;
    char const * end;
};
 
hex_buf to_hex(char const * str, size_t len)
{
    return hex_buf{str, str + len};
}
 
std::ostream & operator <<(std::ostream & out, hex_buf const & x)
{
    out << std::hex;
    std::copy(x.begin, x.end, std::ostream_iterator<hex_view>(out));
    return out;
}
 
int main()
{
    char buffer[100]={1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
    
    std::cout << to_hex(buffer, 15 /*размер */) << std::endl;
}