checksum(receiver)

 #include<stdio.h> 

#include<stdlib.h> 

int main() 

{ 

int a[10],b[10],c[20],temp,sum1[10],chkr[20],carry,i,n,p; 

printf("Enter the number of bits in each segment : "); 

scanf("%d",&n); 

  printf("\n\r At the RECEIVER's end...."); 

  carry=0; 

 

  printf("\n\r Enter the received bits one after another:\n\r "); 

  for(i=n-1;i>=0;i--){ 

   scanf("%d",&a[i]); 

  } 

  

 printf("\n\r"); 

 for(i=n-1;i>=0;i--){ 

  scanf("%d",&b[i]); 

 } 

 

 printf("\n\rNext bits will be identified as checksum\n\r"); 

 for(i=n-1;i>=0;i--){ 

  scanf("%d",&c[i]); 

 } 

 

 printf("\n\r---------- Calculating Receiver's Checksum----------\n\r"); 

 for(i=0;i<n;i++){ 

  sum1[i]=(a[i]+b[i]+c[i]+carry)%2; 

  carry=(a[i]+b[i]+c[i]+carry)/2; 

 } 

 

  printf("\n sum ...."); 

  for(i=n-1;i>=0;i--) 

   printf(" %d",sum1[i]); 

 

  if(carry==1){ 

    for(i=0;i<n;i++){ 

      p=(sum1[i]+carry)%2; 

      carry=(sum1[i]+carry)/2; 

      sum1[i]=p; 

    } 

  } 

 

  printf("\n Wrapped sum ...."); 

  for(i=n-1;i>=0;i--){ 

   chkr[i]=sum1[i]; 

   printf(" %d",sum1[i]); 

  } 

  

  printf("\n Checksum....."); 

  temp=0; 

  for(i=n-1;i>=0;i--){ 

   if(chkr[i]==1) 

      chkr[i]=0; 

   else chkr[i]=1; 

   temp=temp+chkr[i]; 

   printf(" %d",chkr[i]); 

  } 

 

  if(temp!=0){ 

    printf("\n\r Checksum FAILED, Received data is Corrupted."); 

  }else{ 

    printf("\n\r Checksum PASSED."); 

  } 

  

 return 0; 

}