client.c

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#include <arpa/inet.h>
#include <string.h>
#include <arpa/inet.h>
#include <stdio.h>
#define MAXLINE 1024
#define PORT 8200
int main(int argc, char *argv[])
{
    int sockfd;
    int n;
    socklen_t len;
    char sendline[1024], recvline[1024];
    struct sockaddr_in servaddr;
    strcpy(sendline, "");
    printf("\n Enter the message : ");
    scanf("%[^\n]s", sendline);
    sockfd = socket(AF_INET, SOCK_DGRAM, 0);
    servaddr.sin_family = AF_INET;
    servaddr.sin_addr.s_addr = inet_addr(argv[1]);
    servaddr.sin_port = htons(PORT);
    connect(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr));
    len = sizeof(servaddr);
    sendto(sockfd, sendline, MAXLINE, 0, (struct sockaddr *)&servaddr, len);
    n = recvfrom(sockfd, recvline, MAXLINE, 0, NULL, NULL);
    recvline[n] = 0;
    printf("\n Server's Echo : %s\n\n", recvline);
    return 0;
}