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//mysender package mysender.java; import java.io.*;import java.net.*; public class mysender { public static void main(String args[]) { try { ServerSocket ss=new ServerSocket(113); Socket s=ss.accept(); DataInputStream dis=new DataInputStream(s.getInputStream()); DataOutputStream dos=new DataOutputStream(s.getOutputStream()); int p=Integer.parseInt(dis.readUTF()); for(int i=0;i<p;i++) { String Str[]=new String[p]; Str[i]=(String)dis.readUTF(); System.out.println("Frame"+i+" is "+Str[i]); //System.out.println("Ack sent"); dos.writeUTF("ACK"); } ss.close(); } catch(Exception e) {System.out.print(e); } } } //myreceiver package myreceiver.java; import java.io.*; import java.net.*; import java.util.*; public class myreceiver { public static void main(String args[]) { try { Socket s=new Socket("localhost",113); DataOutputStream dout=new DataOutputStream(s.getOutputStream()); DataInputStream di=new DataInputStream(s.getInputStream()); Scanner sc=new Scanner(System.in); System.out.println("Enter the number of frames to be sent"); int n=sc.nextInt(); String k= Integer.toString(n); dout.writeUTF(k); String ack[]=new String[n]; int sendwindow=0; System.out.println("Enter sendwindow size"); sendwindow=sc.nextInt(); for(int i=0,j=0;i<n/sendwindow;i++) { while(j<sendwindow) { System.out.println("enter frame"+j); String fr=sc.next(); dout.writeUTF(fr); ack[i]=(String)di.readUTF(); System.out.println(ack[i]); j++; } j=0; } dout.flush(); dout.close(); s.close(); sc.close(); }catch(Exception e) { System.out.println(e); } } } //crc import java.util.*; class crc1{public static void main(String args[]) { Scanner scan = new Scanner(System.in); int n; System.out.println("Enter the size of the data:"); n = scan.nextInt(); int data[] = new int[n]; System.out.println("Enter the data, bit by bit:"); for(int i=0 ; i < n ; i++) { System.out.println("Enter bit number " + (n-i) + ":"); data[i] = scan.nextInt(); } System.out.println("Enter the size of the divisor:"); n = scan.nextInt(); int divisor[] = new int[n]; System.out.println("Enter the divisor, bit by bit:"); for(int i=0 ; i < n ; i++) { System.out.println("Enter bit number " + (n-i) + ":"); divisor[i] = scan.nextInt(); } int remainder[] = divide(data, divisor); for(int i=0 ; i < remainder.length-1 ; i++) { System.out.print(remainder[i]); } System.out.println("\nThe CRC code generated is:"); for(int i=0 ; i < data.length ; i++) { System.out.print(data[i]); } for(int i=0 ; i < remainder.length-1 ; i++) { System.out.print(remainder[i]); } System.out.println(); int sent_data[] = new int[data.length + remainder.length - 1]; System.out.println("Enter the data to be sent:"); for(int i=0 ; i < sent_data.length ; i++) { System.out.println("Enter bit number " + (sent_data.length-i) + ":"); sent_data[i] = scan.nextInt(); } receive(sent_data, divisor); } static int[] divide(int old_data[], int divisor[]) { int remainder[] , i; int data[] = new int[old_data.length + divisor.length]; System.arraycopy(old_data, 0, data, 0, old_data.length); remainder = new int[divisor.length]; System.arraycopy(data, 0, remainder, 0, divisor.length); for(i=0 ; i < old_data.length ; i++) { System.out.println((i+1) + ".) First data bit is : " + remainder[0]); System.out.print("Remainder : "); if(remainder[0] == 1) { for(int j=1 ; j < divisor.length ; j++) { remainder[j-1] = exor(remainder[j], divisor[j]); System.out.print(remainder[j-1]); } } else { for(int j=1 ; j < divisor.length ; j++) { remainder[j-1] = exor(remainder[j], 0); System.out.print(remainder[j-1]); } } remainder[divisor.length-1] = data[i+divisor.length]; System.out.println(remainder[divisor.length-1]); } return remainder; } static int exor(int a, int b) { if(a == b) { return 0; } return 1; } static void receive(int data[], int divisor[]) { int remainder[] = divide(data, divisor); for(int i=0 ; i < remainder.length ; i++) { if(remainder[i] != 0) { System.out.println("There is an error in received data..."); return; } } System.out.println("Data was received without any error."); } } OUTPUT Enter the size of the data:4 Enter the data, bit by bit Enter bit number 4:1 Enter bit number 3:0 Enter bit number 2:1 Enter bit number 1:1 Enter the size of the divisor:4 Enter the divisor, bit by bit Enter bit number 4:1 Enter bit number 3:0 Enter bit number 2:0 Enter bit number 1:1 1.) First data bit is : 1 Remainder : 0100 2.) First data bit is : 0 Remainder : 1000 3.) First data bit is : 1 Remainder : 0010 4.) First data bit is : 0 Remainder : 0100 010 The CRC code generated is:1011010 Enter the data to be sent Enter bit number 7:1 Enter bit number 6:0 Enter bit number 5:1 Enter bit number 4:1 Enter bit number 3:0 Enter bit number 2:1 Enter bit number 1:0 1.) First data bit is : 1 Remainder : 0100 2.) First data bit is : 0 Remainder : 1001 3.) First data bit is : 1 Remainder : 0000 4.) First data bit is : 0 Remainder : 0000 5.) First data bit is : 0 Remainder : 0000 6.) First data bit is : 0 Remainder : 0000 7.) First data bit is : 0 Remainder : 0000 Data was received without any error.
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