static void Random(Digits mod, Digits arr, int n, Random generator)
{
Debug.Assert(!arr._Overlaps(mod), "overlapping arguments");
int sigDigitN = n;
while (sigDigitN > 0 && mod[sigDigitN - 1] == 0)
{
Debug.Assert(false, "untested code");
arr[sigDigitN - 1] = 0;
sigDigitN--;
}
if (sigDigitN == 0)
{
throw new ArgumentException();
}
Digit nlead = mod[sigDigitN - 1];
int ntry = 0;
do
{
ntry++;
Debug.Assert(ntry <= 100, "too many iterations");
Digits.Random(arr, sigDigitN - 1, generator);
arr[sigDigitN - 1] = Digit.Random(0, nlead, generator);
} while (Digits.Compare(arr, mod, sigDigitN) >= 0);
}
Random(Digits digits, int digitN, Random generator)
{
for (int i = 0; i < digitN; i++)
{
digits[i] = Digit.Random(generator);
}
}