typedef unsigned int u32_t;
typedef unsigned char u8_t;

struct in_addr {
	unsigned int s_addr;
};

char * inet_ntoa(struct in_addr addr)
{
  static u8_t str[16];
  u32_t s_addr = addr.s_addr;
  u8_t inv[3];
  u8_t *rp;
  u8_t *ap;
  u8_t rem;
  u8_t n;
  u8_t i;

  rp = str;
  ap = (char *) &s_addr;
  for (n = 0; n < 4; n++) {
    i = 0;
    do {
      rem = *ap % (u8_t) 10;
      *ap /= (u8_t) 10;
      inv[i++] = '0' + rem;
    }
    while (*ap);
    while (i--)
      *rp++ = inv[i];
    *rp++ = '.';
    ap++;
  }
  *--rp = 0;
  return str;
}

#define A 0xD01E050A
int main(void)
{
	struct in_addr a;
	a.s_addr = A;
	printf ("%s\n", inet_ntoa(a));
	return 0;
}