Implementation of Hamming Code

C program

#include<stdio.h>
#include<conio.h>
void main() {
	int data[7],rec[7],i,c1,c2,c3,c;
	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];
	c3=rec[3]^rec[2]^rec[1]^rec[0];
	c=c3*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();
}

Output