help me about the concept of UDP server and client

#include "stdafx.h"
#include <winsock2.h>
#include <string.h>
#include <conio.h>
#include <stdlib.h>
struct cli
{
	int data;
	int data1;

};
int main(int argc, char* argv[])
{
	cli *o;
	o=new cli[100];
	o->data=10;
	o->data1=11;
	SOCKET clientsocket;                           //create the object for the SOCKET 
	WORD Data = MAKEWORD(2,2);
	WSADATA dataword;
	long inputservernamelong;
	struct hostent *remotehost;
	int integerportnumber;
	char servername[1000],*temporary ;             //Declare the required variables
	struct in_addr addr;
	WSAStartup(Data,&dataword);			            //initiates the Winsock DLL by a process.
	clientsocket = socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP); //create the scoket for udp communication
	if(INVALID_SOCKET == clientsocket)	            //checking the socket
		printf("The socket creation is invalid\n"); 
	else
		printf("Created sucessfully\n");
	printf("\nEnter the server name \n");
	scanf("%s",&servername);
	printf("\nEnter the port number to be communicate to the client\n");
	scanf("%d",&integerportnumber);
	inputservernamelong=inet_addr(servername);
	if(inputservernamelong==-1)
	{
		printf("Resolving the Hostname\n");
		remotehost = gethostbyname(servername);           //resolve the hostname
		addr.s_addr = *(u_long *) remotehost->h_addr_list[0];	
		temporary=inet_ntoa(addr);
	}
	else
		temporary=servername;
	sockaddr_in client;
	client.sin_family = AF_INET;
	client.sin_port = htons(integerportnumber);
	printf("The server address is%s\n\n",temporary);
	client.sin_addr.s_addr = inet_addr(temporary);
	char *buffer;
	int clientsize = sizeof(client);
	buffer=(char*)o;
	sendto(clientsocket,buffer,sizeof(buffer),0,(sockaddr*)&client,clientsize); //send the data to the server
	printf("\nThe server respons\n");
	recvfrom(clientsocket,buffer,sizeof(buffer),0,(sockaddr*)&client,&clientsize); //receive the data from the server
	printf("\nThe current time is %s\n\n",buffer);
	closesocket(clientsocket);                      //close the socket
	WSACleanup();							        //clean the winsockDll
	return 0;
}

// udps.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <winsock2.h>
#include <string.h>
#include <time.h>
#include "newdynamciip.h"
struct cli
{
	int data;
	int data1;
};
int main(int argc, char* argv[])
{
	cli *o1;
	SOCKET serversocket;			//create the object for the SOCKET structure
	WSADATA wdata;
	time_t timevariable;
	int sendersize;	
	char *buffer=new char[100],servername[1024];;				//Declare the required variables
	int portnumber;
	time(&timevariable);
	//define the time function
	WORD startup=MAKEWORD(2,2);		
	WSAStartup(	startup,&wdata);	//Intialise the winsock dll
	serversocket = socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);//create the socket for the udp server
	if(serversocket == INVALID_SOCKET)
		printf("Error on socket Creation\n");
	else
		printf("Socket Sucessfully Created\n");
	sockaddr_in serverconfiguration;
	serverconfiguration.sin_family = AF_INET;
	//gethostname(buffer,sizeof(buffer));
	//strcpy(servername,buffer);
	node* ipaddress;		                //create the pointer for the dll that get the ipaddress of the system
	ipaddress = myfun();	
	strcpy(servername,ipaddress->ip);
	printf("\nThe server name is %s\n",servername);
	printf("Enter the port number\n");
	scanf("%d",&portnumber);
	serverconfiguration.sin_port = htons(portnumber);
	serverconfiguration.sin_addr.s_addr = inet_addr(servername);//initialize the serverconfigurations
	bind(serversocket,(SOCKADDR*)&serverconfiguration,1000);		//Bind the server socket
	sendersize = sizeof(serverconfiguration);
	while(1)
	{
		printf("The server is waiting...\n");
		ZeroMemory(buffer,sizeof(buffer));	//make the buffer memory as zero
		recvfrom(serversocket,buffer,sizeof(buffer),0,(sockaddr*)&serverconfiguration,&sendersize);//receives the request from the client
		o1=(struct cli*)buffer;
		int aa=o1->data;
		int aa1=o1->data1;
		printf("the value is \n\n%d\n",aa1);
		printf("the data part is :: %d\nThe name part is %d",aa,o1->data1);
		//char *currenttime;
	//	currenttime=ctime(&timevariable);  //Get the current time form the system
		//sendto(serversocket,currenttime,strlen(currenttime),0,(sockaddr*)&serverconfiguration,sendersize); //responce to the client
		//printf("\nThe current time sent to the client\n");
		printf("\n The service over\n\n\n");
	}
	closesocket(serversocket);
	WSACleanup();               //close the socket and clean the winsock dll
	return 0;
}