C UDP sender

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

#define ip_address "1.2.3.4" //addr of host doing nc -l -u 32000
#define port_num 32000

int main(int argc, char**argv)
{
  int sockfd;
  struct sockaddr_in servaddr;
  char sendline[1000];

  sockfd=socket(AF_INET,SOCK_DGRAM,0);

  memset(&servaddr,0, sizeof(servaddr));
  servaddr.sin_family = AF_INET;
  servaddr.sin_addr.s_addr=inet_addr(ip_address);
  servaddr.sin_port=htons(port_num);

while (fgets(sendline, 10000,stdin) != NULL)
 {
     sendto(sockfd,sendline,strlen(sendline),0,
         (struct sockaddr *)&servaddr,sizeof(servaddr));
 }
 return 0;
}