#include <stdio.h>
#include <arpa/inet.h>

int main(void)
{
	char* ip_addr = "192.168.18.10";
	int ip_addr_hex;
	char ip_addr_dot[20] = {0};
	inet_pton(AF_INET, ip_addr, &ip_addr_hex);
	printf("%X\n", ip_addr_hex);
	inet_ntop(AF_INET, (void*)&ip_addr_hex, ip_addr_dot, sizeof(ip_addr_dot));
	printf("%s\n", ip_addr_dot);
	return 0;
}