#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#include <arpa/inet.h>


#define MAXLINE 4096 /*max text line length*/
#define SERV_PORT 3000 /*port*/

int
main(int argc, char **argv) 
{
 int sockfd, len, n;
 struct sockaddr_in servaddr;
 char sendline[MAXLINE], recvline[MAXLINE];
	
 //basic check of the arguments
 //additional checks can be inserted
 if (argc !=2) {
  perror("Usage: TCPClient <IP address of the server>"); 
  exit(1);
 }
	
 //Create a socket for the client
 //If sockfd<0 there was an error in the creation of the socket
 if ((sockfd = socket (AF_INET, SOCK_DGRAM, 0)) <0) {
  perror("Problem in creating the socket");
  exit(2);
 }
	
 //Creation of the socket
 memset(&servaddr, 0, sizeof(servaddr));
 servaddr.sin_family = AF_INET;
 servaddr.sin_addr.s_addr= inet_addr(argv[1]);
 servaddr.sin_port =  htons(SERV_PORT); //convert to big-endian order
	
 while (fgets(sendline, MAXLINE, stdin) != NULL) {
	
  len = sizeof(servaddr);
  sendto(sockfd, sendline, strlen(sendline), 0, (struct sockaddr *)&servaddr, len);
  n = recvfrom(sockfd, recvline, MAXLINE,0, (struct sockaddr *)&servaddr, &len);
  recvline[n] = '\0';
  printf("%s", "String received from the server: ");
  fputs(recvline, stdout);
 }

 exit(0);
}