}//end subtract
public HugeInteger product(HugeInteger a)
{
int[] w = { 1 };
int[] x = { 0 };
HugeInteger temp = new HugeInteger(w, 1);
HugeInteger answer = new HugeInteger(x, 1);
while (!a.CheckZero(a))
{
answer = answer.add(this);
a = a.subtractproduct(temp);
}
return(answer);
} //end product
