Hello World client in C

// Hello World client
// Connects REQ socket to tcp://localhost:5555
// Sends "Hello" to server, expects "World" back
#include <zmq.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>

int main (void)
void *context = zmq_ctx_new ();

// Socket to talk to server
printf ("Connecting to hello world server…\n");
void *requester = zmq_socket (context, ZMQ_REQ);
zmq_connect (requester, "tcp://localhost:5555");

int request_nbr;
for (request_nbr = 0; request_nbr != 10; request_nbr++) {
zmq_msg_t request;
zmq_msg_init_size (&request, 5);
memcpy (zmq_msg_data (&request), "Hello", 5);
printf ("Sending Hello %d…\n", request_nbr);
zmq_msg_send (&request, requester, 0);
zmq_msg_close (&request);

zmq_msg_t reply;
zmq_msg_init (&reply);
zmq_msg_recv (&reply, requester, 0);
printf ("Received World %d\n", request_nbr);
zmq_msg_close (&reply);
zmq_close (requester);
zmq_ctx_destroy (context);
return 0;