#include <sys/types.h>#include <sys/socket.h>#include <netdb.h>#include <stdio.h>#include <errno.h>#include <unistd.h>#include "connect_client.h"const char *DAYTIME_PORT="13111";intmain(int argc, char *argv[]){    int connfd, n, m;    char *myhost;    char timeStr[256];    char letter;    myhost = "localhost";    if (argc > 1)         myhost=argv[1];    connfd = connect_client(myhost, DAYTIME_PORT, AF_UNSPEC, SOCK_DGRAM);    if (connfd < 0) {         fprintf(stderr,                  "client error:: could not create connected socket "                 "socket\n");         return -1;    }    letter = '1';    m= write(connfd, &letter, sizeof(letter));    memset(timeStr, 0, sizeof(timeStr));    n = read(connfd,             timeStr,             sizeof(timeStr));    printf("%s\n", timeStr);            close(connfd);    return 0;}