import java.io.

BufferedReader;

import java.io.InputStreamReader;

import java.io.PrintStream;

import java.net.ServerSocket;

import java.net.Socket;

public class client {

public static void main(String[] args) {

int port=5001;

try {

Socket clientSocket=new Socket("localhost",port);

System.out.println("Client Started");

InputStreamReader isr = new InputStreamReader(System.in);

BufferedReader br = new BufferedReader(isr);

PrintStream toServer=new PrintStream(clientSocket.getOutputStream());

BufferedReader fromServer=new BufferedReader(new

String menu="SOCKET PROGRAMMING MENU\n1.FACTORIAL\n2.SUM OF DIGITS OF A

int choice=-1;

do

toServer.flush();

System.out.println(menu);

choice=Integer.parseInt(br.readLine());

toServer.println(choice);

toServer.flush();

switch(choice)

case 1:

System.out.println("ENTER A NO:");
 int no=Integer.parseInt(br.readLine());

toServer.println(no);

int result=Integer.parseInt(fromServer.readLine());

System.out.println("FACTORIAL IS:"+result);

break;

case 2:

System.out.println("ENTER A NO:");

no=Integer.parseInt(br.readLine());

toServer.println(no);

result=Integer.parseInt(fromServer.readLine());

System.out.println("SUM OF EACH DIGITS IS:"+result);

break;

case 3:

String stringmenu="STRING OPERATION

int stringChoice;

do

System.out.println(stringmenu);

stringChoice=Integer.parseInt(br.readLine());

toServer.println(stringChoice);

toServer.flush();

switch(stringChoice)

case 1:

System.out.println("ENTER A String:");

String str=br.readLine();

toServer.println(str);

result=Integer.parseInt(fromServer.readLine());

System.out.println("LENGTH IS:"+result);

break;
case 2:

System.out.println("ENTER First String:");

String first_str=br.readLine();

toServer.println(first_str);

System.out.println("ENTER Second String:");

String second_str=br.readLine();

toServer.println(second_str);

String str_result=fromServer.readLine();

System.out.println(str_result);

break;

case 3:

System.out.println("ENTER First String:");

first_str=br.readLine();

toServer.println(first_str);

System.out.println("ENTER Second String:");

second_str=br.readLine();

toServer.println(second_str);

str_result=fromServer.readLine();

System.out.println("CONCANATED STRING IS"+str_result);

break;

case 4:

System.out.println("ENTER A String:");

str=br.readLine();

toServer.println(str);

str_result=fromServer.readLine();

System.out.println("PALINDROME RESULT:"+str_result);

break;

case 5:

System.out.println("ENTER First String:");

first_str=br.readLine();

toServer.println(first_str);
 System.out.println("ENTER Second(it is checkd as substring) String:");

second_str=br.readLine();

toServer.println(second_str);

str_result=fromServer.readLine();

System.out.println("Substring Result:"+str_result);

break;

case 6:

break;

}while(stringChoice!=6);

break;

case 4:

break;

default:

System.out.println("INVALID CHOICE");

}while(choice!=4);

} catch (Exception e) {

// TODO Auto-generated catch block

}
 import java.io.*;

import java.net.*;

public class server {

/**

* @param args

*/

public static void main(String[] args) {

int port=5001;

try {

ServerSocket serverSocket=new ServerSocket(port);

System.out.println("SERVER WAITING");

Socket clientSocket=serverSocket.accept();

BufferedReader fromClient=new BufferedReader(new

PrintStream toClient=new PrintStream(clientSocket.getOutputStream());

while(true)

int choice=Integer.parseInt(fromClient.readLine());

System.out.print(choice);

switch(choice)

case 1:

int no=Integer.parseInt(fromClient.readLine());

int result=1;

if (no!=0 && no!=1){

for(int i=2;i<=no;i++)

result*=i;

toClient.flush();

toClient.println(result);
 break;

case 2:

no=Integer.parseInt(fromClient.readLine());

result=0;

while(no!=0){

result+=no%10;

no/=10;

toClient.flush();

toClient.println(result);

break;

case 3:

int stringChoice;

do{

stringChoice=Integer.parseInt(fromClient.readLine());;

switch(stringChoice){

case 1:

String first_str=fromClient.readLine();

result=first_str.length();

toClient.flush();

toClient.println(result);

break;

case 2:

first_str=fromClient.readLine();

String second_str=fromClient.readLine();

result=first_str.compareTo(second_str);

String str_result="";

if (result ==0)

str_result="Both are equal";

else if (result<0)

str_result=second_str+" is greater";
 else

str_result=first_str+" is greater";

toClient.flush();

toClient.println(str_result);

break;

case 3:

first_str=fromClient.readLine();

second_str=fromClient.readLine();

result=first_str.compareTo(second_str);

str_result=first_str+second_str;

toClient.flush();

toClient.println(str_result);

break;

case 4:

first_str=fromClient.readLine();

int i,j;

for(i=0,j=first_str.length()-1;i<=j;i++,j--){

if(first_str.charAt(i)!=first_str.charAt(j))

break;

if (i<j) <br=""> str_result="NO";

else

str_result="YES";

toClient.flush();

toClient.println(str_result);

break;

case 5:

first_str=fromClient.readLine();

second_str=fromClient.readLine();

result=first_str.indexOf(second_str);

if(result==-1)
 str_result="NO";

else

str_result="YES";

toClient.flush();

toClient.println(str_result);

break;

case 6:

break;

}while(stringChoice!=6);

break;

case 4:

break;

} catch (Exception e) {

// TODO Auto-generated catch block