Ex_3.4-itoa-previous.c

/* itoa: convert n to characters in s */
void itoa(int n, char s[])
{
    int i, sign;
    if ((sign = n) < 0)  /*record sign */
        n = -n;          /* make n positive */
    i = 0;
    do {  /* generate digits in reverse order */
        s[i++] = n % 10 + '0';  /* get next digit */
    } while (( n /= 10) > 0);   /* delete it */

    if (sign < 0)
        s[i++] = '-';
    s[i] = '\0';
    reverse(s);
}