萌新求助（TCP聊天）

按教材上编了一个TCP聊天程序，但显示
E:\CPP\tx\main.c|27|undefined reference to `__imp_WSAStartup'|
E:\CPP\tx\main.c|35|undefined reference to `__imp_WSACleanup'|
E:\CPP\tx\main.c|39|undefined reference to `__imp_htonl'|
E:\CPP\tx\main.c|40|undefined reference to `__imp_htons'|
E:\CPP\tx\main.c|41|undefined reference to `__imp_socket'|
E:\CPP\tx\main.c|44|undefined reference to `__imp_bind'|
E:\CPP\tx\main.c|49|undefined reference to `__imp_listen'|
E:\CPP\tx\main.c|56|undefined reference to `__imp_accept'|
E:\CPP\tx\main.c|64|undefined reference to `__imp_recv'|
E:\CPP\tx\main.c|83|undefined reference to `__imp_closesocket'|
E:\CPP\tx\main.c|84|undefined reference to `__imp_closesocket'|
E:\CPP\tx\main.c|85|undefined reference to `__imp_WSACleanup'|
E:\CPP\tx\main.c|77|undefined reference to `__imp_send'|
||error: ld returned 1 exit status|
服务端的代码：
#include <stdio.h>
#include <stdlib.h>
#include <winsock.h>
int main()
{
    char Sendbuf[100];
    char Receivebuf[100];
    int SendLen;
    int ReceiveLen;
    int length;

    SOCKET socket_server;
    SOCKET socket_receive;

    SOCKADDR_IN Server_add;
    SOCKADDR_IN Client_add;

    WORD wVersionReuested;
    WSADATA wsaData;
    int error;




    wVersionReuested=MAKEWORD(2,2);

    error=WSAStartup(wVersionReuested,&wsaData);
    if(error!=0)
    {
        printf("加载套接字失败！");
    }
    if(LOBYTE(wsaData.wVersion)!=2||HIBYTE(wsaData.wVersion)!=2)

    {
        WSACleanup();
        return 0;
    }
    Server_add.sin_family=AF_INET;
    Server_add.sin_addr.S_un.S_addr=htonl(INADDR_ANY);
    Server_add.sin_port=htons(5000);
    socket_server=socket(AF_INET,SOCK_STREAM,0);


    if(bind(socket_server,(SOCKADDR*)&Server_add,sizeof(SOCKADDR))==SOCKET_ERROR)
    {
        printf("绑定失败\n");
    }

    if(listen(socket_server,5)<0)
    {
        printf("监听失败\n");
    }

    length=sizeof(SOCKADDR);

    socket_receive=accept(socket_server,(SOCKADDR*)&Client_add,&length);
    if(socket_receive==SOCKET_ERROR)
    {
        printf("连接失败\n");
    }

    while(1)
    {
        ReceiveLen=recv(socket_receive,Receivebuf,100,0);
        if(ReceiveLen<0)
        {
            printf("接收失败/n");
            printf("程序退出\n");
            break;
        }
        else
        {
            printf("client say:%s\n",Receivebuf);
        }
        printf("please enter the massage:");
        scanf("%s",Sendbuf);
        SendLen=send(socket_receive,Sendbuf,100,0);
        if(SendLen<0)
        {
            printf("发送失败\n");
        }
    }
    closesocket(socket_receive);
    closesocket(socket_server);
    WSACleanup();
    return 0;
}
客户端的代码：
#include <stdio.h>
#include <stdlib.h>
#include <winsock.h>
int main()
{
    char Sendbuf[100];
    char Receivebuf[100];
    int SendLen;
    int ReceiveLen;
    int length;

    SOCKET socket_server;
    SOCKET socket_receive;

    SOCKADDR_IN Server_add;
    SOCKADDR_IN Client_add;

    WORD wVersionReuested;
    WSADATA wsaData;
    int error;




    wVersionReuested=MAKEWORD(2,2);

    error=WSAStartup(wVersionReuested,&wsaData);
    if(error!=0)
    {
        printf("加载套接字失败！");
    }
    if(LOBYTE(wsaData.wVersion)!=2||HIBYTE(wsaData.wVersion)!=2)

    {
        WSACleanup();
        return 0;
    }
    Server_add.sin_family=AF_INET;
    Server_add.sin_addr.S_un.S_addr=htonl(INADDR_ANY);
    Server_add.sin_port=htons(5000);
    socket_server=socket(AF_INET,SOCK_STREAM,0);


    if(bind(socket_server,(SOCKADDR*)&Server_add,sizeof(SOCKADDR))==SOCKET_ERROR)
    {
        printf("绑定失败\n");
    }

    if(listen(socket_server,5)<0)
    {
        printf("监听失败\n");
    }

    length=sizeof(SOCKADDR);

    socket_receive=accept(socket_server,(SOCKADDR*)&Client_add,&length);
    if(socket_receive==SOCKET_ERROR)
    {
        printf("连接失败\n");
    }

    while(1)
    {
        ReceiveLen=recv(socket_receive,Receivebuf,100,0);
        if(ReceiveLen<0)
        {
            printf("接收失败/n");
            printf("程序退出\n");
            break;
        }
        else
        {
            printf("client say:%s\n",Receivebuf);
        }
        printf("please enter the massage:");
        scanf("%s",Sendbuf);
        SendLen=send(socket_receive,Sendbuf,100,0);
        if(SendLen<0)
        {
            printf("发送失败\n");
        }
    }
    closesocket(socket_receive);
    closesocket(socket_server);
    WSACleanup();
    return 0;
}
有几个地方不知道该填什么地址，还有上面的几个错误。希望有大佬指点。