=====
NEW
=====
static std::string get_probability_string(const double prob)
{
    std::ostringstream ss;

    if(prob > 0.9995) {
        ss << "100%";
    } else if(prob >= 0.1) {
        ss << 100.0 * prob << std::setw(4) << std::setprecision(1) << '%';
    } else {
        ss << 100.0 * prob << std::setw(3) << std::setprecision(1) << '%';
    }

    return ss.str();
}

=====
OLD
=====
static void format_prob(char str_buf[10], double prob)
{

    if(prob > 0.9995) {
        snprintf(str_buf, 10, "100 %%");
    } else if(prob >= 0.1) {
        snprintf(str_buf, 10, "%4.1f %%", 100.0 * prob);
    } else {
        snprintf(str_buf, 10, " %3.1f %%", 100.0 * prob);
    }

    str_buf[9] = '\0';  //prevents _snprintf error
}