Hamming reciver and sending

#include <stdio.h>

int main()

{

    int d[8],c[4],h[12],i,j,n=0,r[12],c1;

    //Sender Side

 for(i=0;i<8;i++)

 {

  printf("\nEnter %d bit of data=",i);

  scanf("%d",&d[i]);

 }

 printf("\nData entered is=\n");

 for(i=0;i<8;i++)

 printf("%d",d[i]);

 c[0]=d[0]^d[1]^d[3]^d[4]^d[6];

 c[1]=d[0]^d[2]^d[3]^d[5]^d[6];

 c[2]=d[1]^d[2]^d[3]^d[7];

 c[3]=d[4]^d[5]^d[6]^d[7];

 printf("\n Parity bit are %d %d %d %d",c[0],c[1],c[2],c[3]);

 i=0;

 for(j=0;j<12;j++)

 {

  if((pow(2,n)-1)==j)

  {

   h[j]=c[n];

   n++;

  }

  else

  {

   h[j]=d[i];

   i++;

  }

 }

 printf("\nData transmitted is=");

 for(i=0;i<12;i++)

 {

  printf("%d",h[i]);

 }

 //Receiver Side

 printf("\nEnter received code word bits one by one=");

    for(i=0;i<12;i++)

 {

  printf("\nEnter %d bit of data=",i);

  scanf("%d",&r[i]);

 }

 c[0]=r[0]^r[2]^r[4]^r[6]^r[8]^r[10];

 c[1]=r[1]^r[2]^r[5]^r[6]^r[9]^r[10];

 c[2]=r[3]^r[4]^r[5]^r[6]^r[11];

 c[3]=r[7]^r[8]^r[9]^r[10];

 c1=c[3]*8+c[2]*4+c[1]*2+c[0]*1;

 if(c1==0) 

 {

  printf("\ncongratulations there is no error: ");

 } 

 else 

 {

  printf("\nerron on the postion: %d\nthe correct message is \n",c1);

  if(r[c1]==0)

    r[c1]=1; 

  else

    r[c1]=0;

  for (i=0;i<12;i++) 

  {

   printf("%d ",r[i]);

  }

 }

    return 0;

}