Assignment : 2-1

SPPU CN-Practicals (TE-Comp)

Write a program in C/C++ for error detection and correction for 7/8 bits ASCII codes using Hamming

Codes or CRC. Demonstrate the packets captured traces using Wireshark Packet Analyzer

Tool for peer to peer mode.

( 50% students will perform Hamming Code and others will

perform CRC)

Hamming Code--

#include <iostream>

#include<math.h>

using namespace std;

int main() {

int data[11],rec[11],parity[4];

cout << "Hamming Code" << endl;

cout<<"\nSender's Side: \n";

cout<<"Enter 7 Bit data to send separated by space:";

for(int i=10;i>=0;i--)

{

if(i==0||i==1||i==3||i==7)

continue;

cin>>data[i];

}

//Parity Bit Calculation

data[0]=data[2]^data[4]^data[6]^data[8]^data[10];

data[1]=data[2]^data[5]^data[6]^data[9]^data[10];

data[3]=data[4]^data[5]^data[6];

data[7]=data[8]^data[9]^data[10];

cout<<"\nInput Data" ;

for(int i=10;i>=0;i--)

{

if(i==0||i==1||i==3||i==7)

continue;

cout<<data[i];

}

cout<<"\nEncoded Data: ";

for(int i=10;i>=0;i--)

cout<<data[i];

cout<<"\n\nReceiver's Side: ";

cout<<"\nEnter received data bit by bit: ";

for(int i=10;i>=0;i--)

{

cin>>rec[i];

}

parity[0]=rec[0]^rec[2]^rec[4]^rec[6]^rec[8]^rec[10];

parity[1]=rec[1]^rec[2]^rec[5]^rec[6]^rec[9]^rec[10];

parity[2]=rec[3]^rec[4]^rec[5]^rec[6];

parity[3]=rec[7]^rec[8]^rec[9]^rec[10];

if(parity[0]==0&&parity[1]==0&&parity[2]==0&&parity[3]==0)

{

cout<<"Data is Correct.No error.";

}

else

{

cout<<"\nError in the code.\nError Position(Binary): ";

for(int i=3;i>=0;i--)

cout<<parity[i];

int pos=0;

for(int i=0;i<4;i++)

{

pos=pos+(parity[i]*pow(2,i)); //Binary TO Decimal COnversion

}

cout<<"\nError Position(Decimal): "<<pos;

}

return 0;

}