crc code.cpp

#include<iostream>
using namespace std;
void division(int temp[],int gen[],int n,int r)
{
 for(int i=0;i<n;i++)
 {
     if (gen[0]==temp[i])
     {
         for(int j=0,k=i;j<r+1;j++,k++)
             if(!(temp[k]^gen[j]))
                 temp[k]=0;
             else
                 temp[k]=1;
     } }}
int main()
{int n,r,message[50],gen[50],temp[50];
 cout<<"At Sender's End "<<endl;
 cout<<"Enter the number of message bits : ";
 cin>>n;
 cout<<"Enter the number of generator bits : ";
 cin>>r;
 cout<<"hii";
 cout<<"Enter the message1 : ";
  cout<<"Enter the message2: ";
 for(int i=0;i<n;i++)
 { 
     cin>>message[i];
 }
 cout<<"Enter the generator : ";
 for(int i=0;i<r;i++)
     cin>>gen[i];
 r--;
 for(int i=0;i<r;i++)
     message[n+i] = 0;
 for(int i=0;i<n+r;i++)
     temp[i] = message[i];
 division(temp,gen,n,r);
 cout<<"CRC : ";
 for(int i=0;i<r;i++)
 {
     cout<<temp[n+i]<<" ";
     message[n+i] = temp[n+i];
 }
 cout<<endl<<"Transmitted Message : ";
 for(int i=0;i<n+r;i++)
     cout<<message[i]<<" ";
 cout<<endl<<endl<<"At Receiver's End "<<endl;
 cout<<"Enter the received message : ";
 for(int i=0;i<n+r;i++)
     cin>>message[i];
 for(int i=0;i<n+r;i++)
     temp[i] = message[i];
 division(temp,gen,n,r);
 for(int i=0;i<r;i++)
 {
     if(temp[n+i])
     {
         cout<<"Error detected in received message.";
         return 0;
     } }
 cout<<"No error in received Message.\nReceived Message : ";
 for(int i=0;i<n;i++)
     cout<<message[i]<<" ";
	
	return 0;
}