| public static IsValidLuhn ( this digits ) : bool | ||
| digits | this | The int array to evaluate |
| return | bool | |
public static bool IsValidLuhn(this int[] digits)
{
int sum = 0;
bool alt = false;
for (int i = digits.Length - 1; i >= 0; i--)
{
if (alt)
{
digits[i] *= 2;
if (digits[i] > 9)
digits[i] -= 9; // equivalent to adding the value of digits
}
sum += digits[i];
alt = !alt;
}
return sum % 10 == 0;
}
