client1.c

 #include <netdb.h>
 #include <stdio.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <errno.h>
 #include <stdlib.h>
 int main(int argc,char *argv[])
 {
 int sid,n;
 char buffer[1024];
 struct sockaddr_in saddr;
 struct hostent *hen;
 if(argc<3)
 {
 fprintf(stderr,"Error: Host name and port is not given \n");
 exit(1);
 }
 sid=socket(AF_INET,SOCK_DGRAM,0);
 if(sid<0)
 perror("Socket create");
 hen=gethostbyname(argv[1]);
 if(hen==NULL)
 {
 fprintf(stdout,"Host not found");
 exit(1);
 }
 saddr.sin_family=AF_INET;
 saddr.sin_port=htons(atoi(argv[2]));
 bcopy((char *)hen->h_addr,(char *)&saddr.sin_addr.s_addr,hen->h_length);
 if(bind(sid,(struct sockaddr *)&saddr,sizeof(saddr))<0)
 perror("Socket_bind");
 printf("Enter the data u want to send : \n");
 fgets(buffer,1023,stdin);
 n=sendto(sid,buffer,1023,0,(struct sockaddr *)&saddr,sizeof(saddr));
 if(n<0)
 perror("Error in send to");
 close(sid);
 return(0);
 }