Compiling a project for client/server [Linker error] undefined reference to-Collection of common programming errors

I am new to c++ and I am trying to connect to a server (127.0.0.1:4444). When I try to compile this code I get:

[Linker error] undefined reference to WSASartup@8

[Linker error] undefined reference to socket@12

[Linker error] undefined reference to inet_addr@4

[Linker error] undefined reference to etc…

The code:

#include 
#pragma comment(lib, "ws2_32.lib")

int main()
{
    WSADATA WSAData;
    SOCKET sock;
    SOCKADDR_IN sin;
    char buffer[255];
    WSAStartup(MAKEWORD(2,0), &WSAData);

    sock = socket(AF_INET, SOCK_STREAM, 0);
    sin.sin_addr.s_addr = inet_addr("127.0.0.1");
    sin.sin_family = AF_INET;
    sin.sin_port = htons(4444);
    connect(sock, (SOCKADDR *)&sin, sizeof(sin));
    recv(sock, buffer, sizeof(buffer), 0);
    closesocket(sock);
    WSACleanup();
    return 0;
}

Where are my mistake?

Originally posted 2013-11-27 11:51:28.