Socket program in C cannot compile

Hi guys I was reading a book about the socket programming and there were two codes client and server.

here is the server code

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
void error(char *msg)
{
    perror(msg);
    exit(1);
}
int main(int argc, char *argv[])
{
    int sockfd, newsockfd, portno, clilen;
    char buffer[256];
    struct sockaddr_in serv_addr, cli_addr;
    int n;
    if (argc < 2) {
        fprintf(stderr,"ERROR, no port provided/n");
        exit(1);
    }
    sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if(sockfd < 0)
        error("ERROR OPENING SOCKET");
    bzero((char *) &serv_addr, sizeof(serv_addr));
    portno = atoi(argv[1]);
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_addr.s_addr = INADDR_ANY;
    serv_addr.sin_port = htons(portno);
    if(bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) <0)
        error("ERROR on binding");
    listen(sockfd,5);
    clilen = sizeof(cli_addr);
    newsockfd = accept(sockfd, (struct sockaddr *) &cli_addr, &client);
    if(newsockfd < 0)
        error("ERROR ON ACCEPT");
    bzero(buffer,256);
    n = read(newsockfd,buffer,255);
    if(n < 0)
        error("ERROR READING FROM SOCKET");
        printf("HERE IS THE MESSAGE: %s\n",buffer);
        n = write(newsockfd,"I GOT YOUR MESSAGE",18);
        if(n < 0)
            error("ERROR WRITING TO SOCKET");
        return 0;
}

and here is the client code

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>

void error(char *msg)
{
    perror(msg);
    exit(1);
}
int main(int argc, char *argv[])
{
    int sockfd, portno, n;
    struct sockaddr_in serv_addr;
    struct hostent *server;

    char buffer[256];
    if(argc < 3) {
        fprintf(stderr,"USAGE %s hostname port\n", argv[0]);
    }
    portno = atoi(argv[2]);
    sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if(sockfd < 0)
        error("ERROR OPENING SOCKET");
    server = gethostbyname(argv[1]);
    if(server == NULL) {
        fprintf(stderr,"ERROR no such host\n");
        exit(0);
    }
    bzero((char *) &serv_addr, sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;
    bcopy((char *)server->h_addr, (char *)&serv_addr.sin_addr.s_addr, server->h_length);
    serv_addr.sin_port = htons(portno);
    if(connect(sockfd,&serv_addr,sizeof(serv_addr)) < 0)
        error("ERROR CONECTING");
    printf("Please Enter the message: ");
    bzero(buffer,256);
    fgets(buffer,255,stdin);
    n = write(sockfd,buffer,strlen(buffer));
    if(n < 0)
    error("ERROR READING THE SOCKET");
    printf("%s\n",buffer);
    return 0;
}

But when I compile it with visual studio or turbo c++ or borland c++ they gives me error I have downloaded all the required headers but the problem is still there.