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#include<stdio.h>
void main() {
int data[10];
int dataatrec[10],c,c1,c2,c3,i;
printf("Sender: ");
scanf("%d %d %d %d",&data[0] ,&data[1] ,&data[2] ,&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("Encoded Data: ");
for(i=0;i<7;i++)
printf("%d",data[i]);
printf("\nReceiver: ");
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 ;
printf("\nSyndrome bits: %d %d %d", c1, c2, c3);
if(c==0) {
printf("\nNo error while transmission of data\n");
}
else {
printf("\nError 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: ");
//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]);
}
}
}
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