#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>

#define MAXDATASIZE 256

int main(int argc, char *argv[])
{
        int numbytes, sockfd, sockbytes, i, x=0;
        char buf2[1024];
        struct hostent *he;
        struct sockaddr_in their_addr; // connector's address information
        unsigned long answer=0;
        unsigned short one, buf[MAXDATASIZE];

        if (argc != 2) {
            fprintf(stderr,"usage: client hostname\n");
            exit(1);
        }

        if ((he=gethostbyname(argv[1])) == NULL) {  // get the host info
            perror("gethostbyname");
            exit(1);
        }

        if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
            perror("socket");
            exit(1);
        }

        their_addr.sin_family = AF_INET;    // host byte order
        their_addr.sin_port = htons(5842);  // short, network byte order
        their_addr.sin_addr = *((struct in_addr *)he->h_addr);
        memset(their_addr.sin_zero, '\0', sizeof their_addr.sin_zero);

        if (connect(sockfd, (struct sockaddr *)&their_addr, sizeof(struct sockaddr)) == -1) {
            perror("connect");
            exit(1);
        }

        for(i=0;i<4;i++){
                recv(sockfd, buf+i, sizeof(unsigned long), 0);
                printf("%d\n", buf[i]);
                answer+=*(buf+i);
        }

        printf("answer is %d\n",answer);

        send(sockfd, &answer, sizeof(unsigned long), 0);
        recv(sockfd, buf2, 1024, 0);
        printf("%s\n",buf2);



        return 0;
}