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//crc import java.io.*; class CRC { public static void main(String args[]) throws IOException { BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); System.out.println("Enter Generator:"); String gen = br.readLine(); System.out.println("Enter Data:"); String data = br.readLine(); String code = data; while(code.length() < (data.length() + gen.length() - 1)) code = code + "0"; code = data + div(code,gen); System.out.println("The transmitted Code Word is: " + code); System.out.println("Please enter the received Code Word: "); String rec = br.readLine(); if(Integer.parseInt(div(rec,gen)) == 0) System.out.println("The received code word contains no errors."); else System.out.println("The received code word contains errors."); } static String div(String num1,String num2) { int pointer = num2.length(); String result = num1.substring(0, pointer); String remainder = ""; for(int i = 0; i < num2.length(); i++) { if(result.charAt(i) == num2.charAt(i)) remainder += "0"; else remainder += "1"; } while(pointer < num1.length()) { if(remainder.charAt(0) == '0') { remainder = remainder.substring(1, remainder.length()); remainder = remainder + String.valueOf(num1.charAt(pointer)); pointer++; } result = remainder; remainder = ""; for(int i = 0; i < num2.length(); i++) { if(result.charAt(i) == num2.charAt(i)) remainder += "0"; else remainder += "1"; } } return remainder.substring(1,remainder.length()); } } //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); } } }
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