Exp 5 Hamming Code

#include<stdio.h>
#include<conio.h>
void main() {
int data[7],rec[7],i,c1,c2,c4,c;
clrscr();
printf("this works for message of 4bits in size \nenter message bit one by one:  ");
scanf("%d%d%d%d",&data[0],&data[1],&data[2],&data[4]);
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("\nthe encoded bits are given below: \n");
for (i=0;i<7;i++) {
printf("%d ",data[i]);
}
printf("\nenter the received data bits one by one: ");
for (i=0;i<7;i++) {
scanf("%d",&rec[i]);
}
c1=rec[6]^rec[4]^rec[2]^rec[0];
c2=rec[5]^rec[4]^rec[1]^rec[0];
c4=rec[3]^rec[2]^rec[1]^rec[0];
c=c4*4+c2*2+c1 ;
if(c==0) {
printf("\ncongratulations there is no error: ");
} else {
printf("\nerron on the postion: %d\nthe correct message is \n",c);
if(rec[7-c]==0)
rec[7-c]=1;
else
rec[7-c]=0;

for (i=0;i<7;i++) {
printf("%d ",rec[i]);
}
}
getch();
}