itoa_krd()

void itoa_krd(const int & val, char *buf) {
    char t0[sizeof(int) * 4] = {};
    char *s = buf, *t = t0 + sizeof(t0) - 2;
    std::div_t qr;

    qr.quot = val;
    do {
        qr = std::div(qr.quot, 10);
        *(t--) = '0' + qr.rem;
    } while ((qr.quot != 0) || (qr.quot != 0));
    t++;

    do {
        *(s++) = *(t++);
    } while (*t);
}