Default UDP Client

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <unistd.h>

#include <arpa/inet.h>

#define RESET(buff) \

for (i = 0; i < 100; i++) \

buff[i] = '\0';

void error(const char *msg)

{

perror(msg);

exit(1);

}

int main(int argc, char const *argv[])

{

int sockfd, i,j;

struct sockaddr_in serv_addr;

char buff[100];

//Checking the provided port no

if (argc < 3)

error("Port No not provided");

serv_addr.sin_family = AF_INET;

serv_addr.sin_addr.s_addr = inet_addr(argv[1]);

serv_addr.sin_port = htons(atoi(argv[2]));

//Socket

if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0)

error("Error in Socket");

//Sending Message

RESET(buff)

printf("Enter your message: ");

fgets(buff,100,stdin);

sendto(sockfd,buff,100,0,(struct sockaddr*)&serv_addr,sizeof(serv_addr));

//receive Message:

RESET(buff)

int servlen=sizeof(serv_addr);

recvfrom(sockfd, buff, 100, 0,(struct sockaddr*)&serv_addr,&servlen);

printf("Server : %s",buff)

close(sockfd);

printf("\n");

return 0 ;

}