How to create default Zeros for this array and having it be overwritten by the while loop to display the hex value

Question

string Color::Hex(int value)
{
    char hexTable[] = {\'0\',\'1\',\'2\',\'3\',\'4\',\'5\',\'6\',\'7\',\'8\',\'9\',\'A\',\'B\',\'C\',\'D\',\'E\',\'F\'};

    string h