BigInteger 乘以 Double

我的物理老师给全班布置了一项艰巨的任务。我正在尝试创建一个程序来为我计算一些事情。在某个时刻，我需要将分子数量乘以百分比。 Ulong 不能容纳大到 6022 * 10 ^ 19 的数字，所以我必须使用 .net 4.0 中的 BigInteger。但是乘法不能应用于 BigInteger 和 double。我只需要整个数字。有什么办法可以绕过这个吗？ 代码如下：

private static BigInteger pencapmoles = BigInteger.Pow(6022/9, 19);
private static BigInteger inkmoles = pencapmoles;
private static BigInteger tries = 0;
private static BigInteger molesinbucket = BigInteger.Pow(26761768, 19);
private static double percentage;
static void Main(string[] args)
{
    while (inkmoles > 1) 
    {
        percentage = (double)(inkmoles / molesinbucket);
        inkmoles = pencapmoles * percentage;
        tries++;
    }
    Console.WriteLine($"It only took us {tries} tries.");
}

You would be better off switching all computations either to double or to BigInteger. C# double has enough range to hold values a lot greater than 10¹⁹, but the answer is going to have a slight imprecision. It is a near certainty that it is going to be enough for the purposes of solvind your task.

如果你切换到BigInteger，先乘，再除：

inkmoles = (inkmoles * pencapmoles) / molesinbucket;