#include <iostream>
#include <cassert>

using namespace std;

//char nibble_to_hex(uint8_t i)
char nibble_to_hex(uint8_t i) //Conversion to hex format
{
    assert(0x0 <= i && i <= 0xf);
    return "0123456789abcdef"[i];
}

void print_in_hex(uint8_t byte)
{
cout << nibble_to_hex(byte >> 4)
    << nibble_to_hex(byte & 0xf)
    << endl;
}

const uint8_t* as_bytes(const void* data);

void print_in_hex(const void* data, size_t size)
{
    const uint8_t* bytes = as_bytes(data);
    for (size_t i = 0; i < size; i++)
        {
            print_in_hex(bytes[i]);

            if ((i + 1) % 16 == 0)
            {
                cout << '\n';
            }
            else
            {
                cout << ' ';
            }
        }
}

const uint8_t* as_bytes(const void* data)
{
    return reinterpret_cast<const uint8_t*>(data);
}



int main()
{

    assert(nibble_to_hex(0x0) == '0');
    assert(nibble_to_hex(0x1) == '1');
    assert(nibble_to_hex(0x2) == '2');
    assert(nibble_to_hex(0x3) == '3');
    assert(nibble_to_hex(0x4) == '4');
    assert(nibble_to_hex(0x5) == '5');
    assert(nibble_to_hex(0x6) == '6');
    assert(nibble_to_hex(0x7) == '7');
    assert(nibble_to_hex(0x8) == '8');
    assert(nibble_to_hex(0x9) == '9');
    assert(nibble_to_hex(0xa) == 'a');
    assert(nibble_to_hex(0xb) == 'b');
    assert(nibble_to_hex(0xc) == 'c');
    assert(nibble_to_hex(0xd) == 'd');
    assert(nibble_to_hex(0xe) == 'e');
    assert(nibble_to_hex(0xf) == 'f');

    uint8_t byte = 0xff;

    uint8_t u8 = 0x42;
    cout << "u8 bytes: ";
    print_in_hex(&u8, sizeof(u8));
    cout << '\n';

    uint16_t u16 = 0x42;
    cout << "u16 bytes: ";
    print_in_hex(&u16, sizeof(u16));
    cout << '\n';

    uint32_t u32 = 0x42;
    cout << "u32 bytes: ";
    print_in_hex(&u32, sizeof(u32));
    cout << '\n';


    //print_in_hex(byte);


    cout << "Press any key for exit... ";
    cin.get();
    return 0;
}