84. ERROR DETECTION USING CHECKSUM

//CHECKSUM

import java.util.*;

public class Checksum 
{
static int check[]=new int[4];
static int code[]=new int[12];
public static void exor(int a[], int n)
{
int i,j=0;
for(i=0;i<4;i++)
{
if((a[i]==1 && a[i+4]==1)||(a[i]==0 && a[i+4]==0))
{
check[i]=0;
}
else
{
check[i]=1;
}     
}