84. ERROR DETECTION USING CHECKSUM

//CHECKSUM

import java.util.*;

public class Checksum 
{
static int check[]=new int[4];
static int code[]=new int[12];
public static void exor(int a[], int n)
{
int i,j=0;
for(i=0;i<4;i++)
{
if((a[i]==1 && a[i+4]==1)||(a[i]==0 && a[i+4]==0))
{
check[i]=0;
}
else
{
check[i]=1;
}     
}

83. STOP & WAIT PROTOCOL USING SOCKETS IN JAVA

//SENDER PROGRAM

import java.io.*;

import java.net.*;

public class Sender{

Socket sender;

ObjectOutputStream out;

ObjectInputStream in;

String packet,ack,str, msg;

int n,i=0,sequence=0;

Sender(){}

public void run(){

 try{

 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

System.out.println("Waiting for Connection....");

 sender = new Socket("localhost",2004);

sequence=0;

82. JAVA PROGRAM FOR SLIDING WINDOW PROTOCOL

//SENDER PROGRAM

import java.net.*;

import java.io.*;

import java.rmi.*;

public class slidsender

{

public static void main(String a[])throws Exception

{

ServerSocket ser=new ServerSocket(10);

Socket s=ser.accept();

DataInputStream in=new DataInputStream(System.in);

DataInputStream in1=new DataInputStream(s.getInputStream());

String sbuff[]=new String[8];

PrintStream p;

int sptr=0,sws=8,nf,ano,i;

String ch;

do

{

p=new PrintStream(s.getOutputStream());

System.out.print("Enter the no. of frames : ");

nf=Integer.parseInt(in.readLine());

p.println(nf);

if(nf<=sws-1)

{

81. TCP/UDP CLIENT SERVER PROGRAM IN JAVA

//CLEINT PROGRAM

import java.io.*;

import java.net.*;

import java.lang.*;

class client

{

public static void main(String a[])throws IOException

{

Socket s=new Socket("LocalHost",8000);

DataInputStream in=new DataInputStream(s.getInputStream());

DataInputStream inn=new DataInputStream(System.in);

PrintStream dos=new PrintStream(s.getOutputStream());

while(true)

{

String str=in.readLine();

System.out.println("msg received:"+str);

if(str.equals("end"))

{

80. JAVA PROGRAM FOR HAMMING CODE

//HAMMING CODE

import java.util.*;

import java.lang.*;

class Hamming

{

            public static void main(String args[])

            {

                        int i=0,j,d=0,sum=0;

                        int a[]=new int[7];

                        int b[]=new int[11];

                        int c[]=new int[11];

                        int p[]=new int[4];

                        Scanner sr=new Scanner(System.in);

                        System.out.println("Enter the data code:");

                        for(i=0;i<7;i++)

                        {

                                    a[i]=sr.nextInt();

                        }

79. JAVA PROGRAM FOR CYCLIC REDUNDANCY CHECK

//CYCLIC REDUNDANCY CHECK

import java.io.*;

import java.lang.*;

public class crc

{

public static void main(String args[]) throws IOException

{

int f[]=new int[25];

int gen[]=new int[10];

int rem[]=new int[10];

int flen,glen,rlen,i,j;

int p,sum,iframe,igen,irem;

String data;

78. BLOCK INTERCHANGE IN 8086

DATA SEGMENT
X DB 01H,02H,03H,04H,05H
Y DB 11H,12H,13H,14H,15H
DATA ENDS
CODE SEGMENT
ASSUME CS:CODE,DS:DATA
START:MOV AX,DATA
MOV DS,AX
MOV CX,05H
LEA SI,X 
LEA DI,Y 
UP: MOV BL,[SI] 
MOV AL,[DI]
MOV [SI],AL 
MOV [DI],BL 
INC SI 
INC DI
DEC CX 
JNZ UP
MOV AH,4CH
INT 21H
CODE ENDS
END START

77. BLOCK TRANSFER IN 8086

DATA SEGMENT
X DB 01H,02H,03H,04H,05H
DATA ENDS
CODE SEGMENT
ASSUME CS:CODE,DS:DATA
START:MOV AX,DATA 
MOV DS,AX
MOV CX,05H 
LEA SI,X+04 
LEA DI,X+04+03
UP: MOV BL,[SI] 
MOV [DI],BL 
DEC SI 
DEC DI
DEC CX 
JNZ UP
MOV AH,4CH
INT 21H
CODE ENDS
END START

76. TCP CLIENT & SRVER IN JAVA

//TCP SERVER
import java.lang.*; import java.io.*; import java.net.*; class Server { public static void main(String args[]) { String data = "Toobie ornaught toobie"; try { ServerSocket srvr = new ServerSocket(1234); Socket skt = srvr.accept(); System.out.print("Server has connected!\n"); PrintWriter out = new PrintWriter(skt.getOutputStream(), true);

75. HTTP SERVER IN JAVA

// HTTP SERVER
import java.io.*;
import java.net.*;
import java.util.*;
import java.lang.*;


public class HttpServer
{
     public static void main(String [] args)
     {
          int i=1;
System.out.println("********************************************************************************");
System.out.println("******************************  HTTP 
SERVER***********************************");
System.out.println("********************************************************************************");
          System.out.println("Server Started...");
          System.out.println("Waiting for connections...");
          try
          {