// Java program to illustrate Client Side Programming // for Simple Calculator using TCP import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.IOException; import java.net.InetAddress; import java.net.Socket; import java.net.UnknownHostException; import java.util.Scanner; public class Calc_Client {  public static void main(String[] args) throws IOException  {  InetAddress ip = InetAddress.getLocalHost();  int port = 4444;  Scanner sc = new Scanner(System.in);  // Step 1: Open the socket connection.  Socket s = new Socket(ip port);  // Step 2: Communication-get the input and output stream  DataInputStream dis = new DataInputStream(s.getInputStream());  DataOutputStream dos = new DataOutputStream(s.getOutputStream());  while (true)  {  // Enter the equation in the form-  // 'operand1 operation operand2'  System.out.print('Enter the equation in the form: ');  System.out.println(''operand operator operand'');  String inp = sc.nextLine();  if (inp.equals('bye'))  break;  // send the equation to server  dos.writeUTF(inp);  // wait till request is processed and sent back to client  String ans = dis.readUTF();  System.out.println('Answer=' + ans);  }  } } 

// Java program to illustrate Server Side Programming // for Simple Calculator using TCP import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.IOException; import java.net.ServerSocket; import java.net.Socket; import java.util.StringTokenizer; public class Calc_Server {  public static void main(String args[]) throws IOException  {  // Step 1: Establish the socket connection.  ServerSocket ss = new ServerSocket(4444);  Socket s = ss.accept();  // Step 2: Processing the request.  DataInputStream dis = new DataInputStream(s.getInputStream());  DataOutputStream dos = new DataOutputStream(s.getOutputStream());  while (true)  {  // wait for input  String input = dis.readUTF();  if(input.equals('bye'))  break;  System.out.println('Equation received:-' + input);  int result;  // Use StringTokenizer to break the equation into operand and  // operation  StringTokenizer st = new StringTokenizer(input);  int oprnd1 = Integer.parseInt(st.nextToken());  String operation = st.nextToken();  int oprnd2 = Integer.parseInt(st.nextToken());  // perform the required operation.  if (operation.equals('+'))  {  result = oprnd1 + oprnd2;  }  else if (operation.equals('-'))  {  result = oprnd1 - oprnd2;  }  else if (operation.equals('*'))  {  result = oprnd1 * oprnd2;  }  else  {  result = oprnd1 / oprnd2;  }  System.out.println('Sending the result...');  // send the result back to the client.  dos.writeUTF(Integer.toString(result));  }  } }