//////////////////Ŭ¶óÀ̾ðÆ®
void __cdecl RecvThread(void * p)
{
	SOCKET sock = (SOCKET)p;
	char buf[256];
	while (1)
	{
		int recvsize = recv(sock, buf, sizeof(buf), 0);
		if (recvsize == 0)
		{
			printf("Á¢¼ÓÁ¾·á\n");
			break;
		}
		buf[recvsize] = '\0';
		printf("\rserver ÀÔ·Â>> %s\n>> ", buf);
	}
}

int _tmain(int argc, _TCHAR* argv[])
{
	WSADATA wsaData;
	int retval = WSAStartup(MAKEWORD(2, 2), &wsaData);
	if (retval != 0)
	{
		printf("WSAStartup() Error\n");
		return 0;
	}

	SOCKET serv_sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

	SOCKADDR_IN serv_addr;
	serv_addr.sin_family = AF_INET;
	serv_addr.sin_port = htons(4000);
	serv_addr.sin_addr.s_addr = inet_addr("61.81.99.77");

	retval = connect(serv_sock, (SOCKADDR*)&serv_addr, sizeof(SOCKADDR));
	if (retval == SOCKET_ERROR)
	{
		printf("connect() Error\n");
		return 0;
	}
	_beginthread(RecvThread, NULL, (void*)serv_sock);


	while (1)
	{
		char buf[255] = { 0 };
		printf("¼­¹ö¿¡ ¿¬°áµÇ¾ú½À´Ï´Ù");
		printf("ÀÔ·Â>> ");
		gets(buf);
		int sendsize = send(serv_sock, buf, strlen(buf), 0);
		if (sendsize == 0)
			break;
	}

	closesocket(serv_sock);
	WSACleanup();
}

//////////////////////////////////¼­¹ö
void __cdecl RecvThread(void * p)
{
	SOCKET sock = (SOCKET)p;
	char buf[256];
	while (1)
	{
		int recvsize = recv(sock, buf, sizeof(buf), 0);
		if (recvsize == 0)
		{
			printf("Á¢¼ÓÁ¾·á\n");
			break;
		}
		buf[recvsize] = '\0';
		printf("\rÁ¢¼ÓÀÚ >> %s\n>> ", buf);
	}
}

int _tmain(int argc, TCHAR* argv[])
{
	WSADATA wsaData;
	int retval = WSAStartup(MAKEWORD(2, 2), &wsaData);
	if (retval != 0)
	{
		printf("WSAStartup() Error\n");
		return 0;
	}

	SOCKET serv_sock;
	serv_sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	if (serv_sock == SOCKET_ERROR)
	{
		printf("socket() Error\n");
		return 0;
	}

	SOCKADDR_IN serv_addr = { 0 };
	serv_addr.sin_family = AF_INET;
	serv_addr.sin_port = htons(4000);
	serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);

	retval = bind(serv_sock, (SOCKADDR*)&serv_addr, sizeof(SOCKADDR));
	if (retval == SOCKET_ERROR)
	{
		printf("bind() Error\n");
		return 0;
	}

	listen(serv_sock, 5);

	SOCKADDR_IN clnt_addr = { 0 };
	int size = sizeof(SOCKADDR_IN);
	SOCKET clnt_sock = accept(serv_sock, (SOCKADDR*)&clnt_addr, &size);
	if (clnt_sock == SOCKET_ERROR)
	{
		printf("accept() Error\n");
		return 0;
	}
	printf("Ŭ¶óÀ̾ðÆ® Á¢¼Ó\n");
	printf("IP : %s, Port : %d\n", inet_ntoa(clnt_addr.sin_addr), clnt_addr.sin_port);
	_beginthread(RecvThread, NULL, (void*)clnt_sock);

	while (1)
	{
		char buf[255] = { 0 };
		printf(">> ");
		gets(buf);
		int sendsize = send(clnt_sock, buf, strlen(buf), 0);
		if (sendsize == 0)
			break;
	}

	closesocket(clnt_sock);
	closesocket(serv_sock);
	WSACleanup();
}

ÀÌ·¯ÇÑ ±¸Á¶Ã¼¸¦ ³Ñ±â°í ½Í½À´Ï´Ù.
struct student{
  char name[20];
  int a,b;
 };