client

#include <stdio.h>
#include <sys/socket.h>
#include <stdlib.h>
#include <netinet/in.h>
#include <string.h>
int main(int argc, char const *argv[])
{
  int PORT = atoi(argv[1]);
  int sock = 0, valread;
  char command[200];
  struct sockaddr_in serv_addr;
  char *hello = "Hello from client";
  char buffer[17];
  if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
    {
      printf("\n Socket creation error \n");
      return -1;
    }

  memset(&serv_addr, '0', sizeof(serv_addr));

  serv_addr.sin_family = AF_INET;
  serv_addr.sin_port = htons(PORT);

  // Convert IPv4 and IPv6 addresses from text to binary form
  if(inet_pton(AF_INET, argv[2], &serv_addr.sin_addr)<=0)
    {
      printf("\nInvalid address/ Address not supported \n");
      return -1;
    }

  if (connect(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0){//try UDP if fails first
    struct hostent *server;
    int addr_length;
    if ((sock=socket(AF_INET, SOCK_DGRAM,0))<0){
      printf("\n Socket creation error \n");
      return -1;
    }
    addr_length=sizeof(serv_addr);
    int buffersize=sizeof(buffer);
    int cmdsize=sizeof(command);
    while(1){
      scanf ("%[^\n]%*c", command);
      sendto(sock, command, cmdsize, 0, &serv_addr, addr_length);
      printf("command sent\n");
      if((valread = recvfrom(sock, buffer, buffersize, 0,(struct sockaddr *) &serv_addr, &addr_length))<0){
    printf("failure\n");
      }

      printf("buffer: %s",buffer);

    }

    printf("\nConnection Failed \n");
    return -1;
  }
  while(1){
    scanf ("%[^\n]%*c", command);
    send(sock , command , strlen(command) , 0 );
    printf("Hello message sent\n");
    valread = read( sock , buffer, 1024);
    printf("%s\n",buffer );
  }
  return 0;
}