printf("Handling client %s\n",inet_ntoa(their_addr.sin_addr));
if (send(new_fd, "Menu\n", 5, 0) == -1)     //(1)                          
	perror("send");
if(send(new_fd, "1. A.mp3, 2. B.mp3, C.mp3\n", 26,0) == -1)  //(2)
	perror("send");
if(send(new_fd, "Which file to play?\n", 20, 0) == -1)     //(3)
	perror("send");

buf[numbytes] = '\0';
printf("%s",buf);
printf("Enter your song number : ");  //(4)
fflush(stdin);
gets(choice);

#define PORT 3490 // the port client will be connecting to 
 
#define MAXDATASIZE 100 // max number of bytes we can get at once 
 
int main(int argc, char *argv[])
{
	int sockfd, numbytes, rcvSize;  
	char buf[MAXDATASIZE];
	char choice[10];
	struct hostent *he;
	struct sockaddr_in their_addr; // connector's address information 
 
	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(PORT);  // 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 their_addr) == -1) {
	    perror("connect");
	    exit(1);
	}
 
	if ((numbytes=recv(sockfd, buf, MAXDATASIZE-1, 0)) == -1) {
	    perror("recv");
	    exit(1);
	}
 
	buf[numbytes] = '\0';
 
	printf("%s",buf);
 
	printf("Enter your song number : ");
	fflush(stdin);
	gets(choice);
	if(send(sockfd, choice, 7, 0) == -1)
		perror("send");
 
        return 0;
}

char buf[] = "hello";
int len = strlen( buff );

if ( n < len ) {
  n = send( fd, buff[n], len-n, 0 );
}

char buf[] = "hello";
int len = strlen( buf );
char *bp = buf;
while ( len > 0 ) {
  n = send( fd, bp, len, 0 );
  if ( n > 0 ) {
    // at least partly successful, advance through the buffer
    len -= n;
    bp += n;
  } else if ( n == 0 ) {
    // connection closed
  } else {
    // an error
  }
}

 Menu :
1. A.mp3    2.B.mp3       3.C.mp3
Which file to play?