SmartColiseum

//java program for decimal checksum import java.util.*; import java.io.*; class DjCheck1 { int i,j,k,l,m; int ans=0,ans1=0; //String pck=""; public void checksum() { System.out.println("How many message you want to send ?"); Scanner s=new Scanner(System.in); i=s.nextInt(); int msg[][]=new int[i][8]; Scanner s1=new Scanner(System.in); for(j=0;j<i;j++) { System.out.println(" Enter your decimal value: "); for(k=0;k<8;k++) { msg[j][k]=s1.nextInt(); } } for(l=0;l<i;l++) { ans=0;ans1=0; System.out.print("[ "); for(m=0;m<8;m++) { System.out.print(msg[l][m]+" , "); ans+=msg[l][m]; ans1=0-ans; } System.out.print(ans1+" ]"); if(ans+ans1==0) { System.out.print(" no error."); } else { System.out.print(" error in your message."); } System.out.println(); }

//java program for binary checksum import java.util.*; import java.io.*; class DjCheck1 { int i,j,k,l,m,n; String and=""; String compl=""; int ans; public void checksum() { int[] msg1=new int[8]; int[] msg2=new int[8]; Scanner s=new Scanner(System.in); System.out.println(" Enter your 1st binary value [8 bit]: "); for(i=0;i<8;i++) // to get values { msg1[i]=s.nextInt(); } System.out.println(" Enter your 2nd binary value [8 bit]: "); for(j=0;j<8;j++) { msg2[j]=s.nextInt(); } System.out.print("\nValue 1: "); for(k=0;k<8;k++) // to print values { System.out.print(msg1[k]); } System.out.print("\nValue 2: "); for(l=0;l<8;l++) { System.out.print(msg2[l]); } for(m=0;m<8;m++) // for 1s complement { and+=msg1[m] & msg2[m]; if(and.charAt(m)=='0') compl+="1"; else c

/*java program for block parity or double parity (block parity). Calculating each column of multiple messages to check if it is even or odd. In Case of even value add 1 otherwise 0 to make even parity of column  eg. 10110101 11110011 _________ 01000110 */ import java.util.*; class DjParity1 { int i,j,k,l; String ans=""; public void blockParity() { System.out.println("How many message you want to send: "); Scanner s=new Scanner(System.in); i=s.nextInt(); String msg[]=new String[i]; Scanner s1=new Scanner(System.in); for(j=0;j<i;j++) { System.out.println("Enter your msg value[0/1] 8 bit: "); msg[j]=s1.nextLine(); } for(k=0;k<msg[0].length();k++) { //System.out.println("hello "+msg[k]); int a=0; for(l=0;l<i;l++) { a+=msg[l].charAt(k); //System.out.println("Your msg: "+msg[l]); } if(a%2==0) { ans+="0"; } else

/*Here, sender will send message to receiver and wait for acknowledgment for some time(here 3 sec). If receiver failed to response acknowledgement, sender resend the same message(here, 3 times). */ //sender to send message for protocol 3 import java.io.*; import java.net.*; public class protocol3_Sender { public static void main(String args[]) { try { Socket s=new Socket("localhost",6666); DataOutputStream dos=new DataOutputStream(s.getOutputStream()); DataInputStream dis=new DataInputStream(s.getInputStream()); BufferedReader br= new BufferedReader(new InputStreamReader(System.in)); String str="",ack="",ch=""; do { System.out.println("Enter your message: "); str=br.readLine(); System.out.println("String: "+str); dos.writeUTF(str); ack=dis.readUTF(); for(int i=0;i<3;i++) { Thread.sleep(3000); if(ack.equals(""))

//sender to send message for protocol 1 import java.io.*; import java.net.*; public class protocol2_Sender { public static void main(String args[]) { try { Socket s=new Socket("localhost",6666); DataOutputStream dos=new DataOutputStream(s.getOutputStream()); DataInputStream dis=new DataInputStream(s.getInputStream()); BufferedReader br= new BufferedReader(new InputStreamReader(System.in)); String str="",signal=""; do { System.out.println("Sender: "); str=br.readLine(); System.out.println("String: "+str); dos.writeUTF(str); //dos.writeUTF(ch); //dos.flush(); signal=dis.readUTF(); System.out.println("Server says: " +signal); }while(signal.equals("signal")); //dos.flush(); dos.close(); //s.close(); } catch(IOException e) { System.out.println(e.getMessage()); } } } //receiver to

//sender to send message for protocol 1 import java.io.*; import java.net.*; public class protocol1_Sender { public static void main(String args[]) { try { Socket s=new Socket("localhost",6666); DataOutputStream dos=new DataOutputStream(s.getOutputStream()); DataInputStream dis=new DataInputStream(s.getInputStream()); BufferedReader br= new BufferedReader(new InputStreamReader(System.in)); String str="",ch=""; do { System.out.println("Sender: "); str=br.readLine(); System.out.println("String: "+str); dos.writeUTF(str); System.out.println("press 1 to continue.. "); ch=br.readLine(); dos.writeUTF(ch); //str1=dis.readUTF(); //System.out.println("Server says: " +str1); }while(ch.equals("1")); dos.flush(); dos.close(); //s.close(); } catch(IOException e)

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