#include <iostream>
#include <cassert>

using namespace std;

char nibble_to_hex(uint8_t i) //Conversion to hex format
{
    assert(0x0 <= i && i <= 0xf);
    //return "0123456789abcdef"[i];
    if (i < 10)
    {
        return i + '0';
    }
    else
    {
        return 'a' + (i - 10);
    }
}




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');


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