network
Hamming code
#include<stdio.h>
void main() {
int data[10];
int dataatrec[10],c,c1,c2,c3,i;
printf("Enter 4 bits of data one by one\n");
scanf("%d",&data[0]);
scanf("%d",&data[1]);
scanf("%d",&data[2]);
scanf("%d",&data[4]);
//Calculation of even parity
data[6]=data[0]^data[2]^data[4];
data[5]=data[0]^data[1]^data[4];
data[3]=data[0]^data[1]^data[2];
printf("\nEncoded data is\n");
for(i=0;i<7;i++)
printf("%d",data[i]);
printf("\n\nEnter received data bits one by one\n");
for(i=0;i<7;i++)
scanf("%d",&dataatrec[i]);
c1=dataatrec[6]^dataatrec[4]^dataatrec[2]^dataatrec[0];
c2=dataatrec[5]^dataatrec[4]^dataatrec[1]^dataatrec[0];
c3=dataatrec[3]^dataatrec[2]^dataatrec[1]^dataatrec[0];
c=c3*4+c2*2+c1 ;
if(c==0) {
printf("\nNo error while transmission of data\n");
}
else {
printf("\nError on position %d",c);
printf("\nData sent : ");
for(i=0;i<7;i++)
printf("%d",data[i]);
printf("\nData received : ");
for(i=0;i<7;i++)
printf("%d",dataatrec[i]);
printf("\nCorrect message is\n");
//if errorneous bit is 0 we complement it else vice versa
if(dataatrec[7-c]==0)
dataatrec[7-c]=1;
else
dataatrec[7-c]=0;
for (i=0;i<7;i++) {
printf("%d",dataatrec[i]);
}
}
}
CRC
#include <stdio.h>
#include <conio.h>
#include <string.h>
void main() {
int i,j,keylen,msglen;
char input[100], key[30],temp[30],quot[100],rem[30],key1[30];
printf("Enter Data: ");
gets(input);
printf("Enter Key: ");
gets(key);
keylen=strlen(key);
msglen=strlen(input);
strcpy(key1,key);
for (i=0;i<keylen-1;i++) {
input[msglen+i]='0';
}
for (i=0;i<keylen;i++)
temp[i]=input[i];
for (i=0;i<msglen;i++) {
quot[i]=temp[0];
if(quot[i]=='0')
for (j=0;j<keylen;j++)
key[j]='0'; else
for (j=0;j<keylen;j++)
key[j]=key1[j];
for (j=keylen-1;j>0;j--) {
if(temp[j]==key[j])
rem[j-1]='0'; else
rem[j-1]='1';
}
rem[keylen-1]=input[i+keylen];
strcpy(temp,rem);
}
strcpy(rem,temp);
printf("\nQuotient is ");
for (i=0;i<msglen;i++)
printf("%c",quot[i]);
printf("\nRemainder is ");
for (i=0;i<keylen-1;i++)
printf("%c",rem[i]);
printf("\nFinal data is: ");
for (i=0;i<msglen;i++)
printf("%c",input[i]);
for (i=0;i<keylen-1;i++)
printf("%c",rem[i]);
}
BIT Staffing
#include<stdio.h>
#include<string.h>
int main()
{
int a[20],b[30],i,j,k,count,n;
printf("Enter frame size (Example: 8):");
scanf("%d",&n);
printf("Enter the frame in the form of 0 and 1 :");
for(i=0; i<n; i++)
scanf("%d",&a[i]);
i=0;
count=1;
j=0;
while(i<n)
{
if(a[i]==1)
{
b[j]=a[i];
for(k=i+1; a[k]==1 && k<n && count<5; k++)
{
j++;
b[j]=a[k];
count++;
if(count==5)
{
j++;
b[j]=0;
}
i=k;
}
}
else
{
b[j]=a[i];
}
i++;
j++;
}
printf("After Bit Stuffing :");
for(i=0; i<j; i++)
printf("%d",b[i]);
return 0;
}
Myserver.java
import java.io.*;
import java.net.*;
public class Myserver {
public static void main(String[] args){
try{
ServerSocket ss=new ServerSocket(6666);
Socket s=ss.accept();//establishes connection
DataInputStream dis=new DataInputStream(s.getInputStream());
String str=(String)dis.readUTF();
System.out.println("message= "+str);
ss.close();
}catch(Exception e){System.out.println(e);}
}
}
Myclient.java
import java.io.*;
import java.net.*;
public class MyClient {
public static void main(String[] args) {
try{
Socket s=new Socket("localhost",6666);
DataOutputStream dout=new DataOutputStream(s.getOutputStream());
dout.writeUTF("Hello Server");
dout.flush();
dout.close();
s.close();
}catch(Exception e){System.out.println(e);}
}
}
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