public BigFloat Calculate(int precision, Func <bool> stopFunc)
{
BigInteger l = 13591409;
BigInteger x = 1;
var goal = AccuracyGoal.Relative(precision + 10);
BigFloat.DefaultAccuracyGoal = goal;
BigFloat.DefaultRoundingMode = RoundingMode.TowardsNearest;
var m = (BigFloat)1;
long k = 6;
var sum = (BigFloat)13591409;
for (var index = 1; index < int.MaxValue; index++)
{
//if (stopFunc())
//{
// return -1;
//}
l += 545140134;
x *= -262537412640768000;
m = m * (BigInteger.Pow(k, 3) - 16 * k) /
BigInteger.Pow(index, 3);
BigFloat c;
sum += (c = (m * l / x));
k += 12;
var correctionDigits = -c.GetDecimalDigits();
if (correctionDigits >= precision)
{
break;
}
}
var alpha = 426880 * BigFloat.Sqrt(10005, goal, RoundingMode.TowardsNearest);
var pi = alpha / sum;
//if (stopFunc())
//{
// return -1;
//}
return(pi.RestrictPrecision(AccuracyGoal.Absolute(precision), new RoundingMode()));
}
public static void Main(String[] args)
{
//multiple ways to construct a BigFloat
BigFloat bigfloat1 = new BigFloat(1234567);
BigFloat bigfloat2 = new BigFloat("1234567");
BigFloat bigfloat3 = new BigFloat(1234567.0);
BigFloat bigfloat4 = BigFloat.Parse("1234567.123");
Console.WriteLine("(1234567 * 12)^2 - 15 = \n");
Console.WriteLine("Arithmetic: " + (Math.Pow(1234567 * 12, 2) - 15));
//non-static methods
Console.WriteLine("BigFloat w/ non-static: " + bigfloat1.Multiply(12).Pow(2).Subtract(15));
//static methods
bigfloat2 = BigFloat.Multiply(bigfloat2, 12);
bigfloat2 = BigFloat.Pow(bigfloat2, 2);
bigfloat2 = BigFloat.Subtract(bigfloat2, new BigInteger(15));
Console.WriteLine("BigFloat w/ static : " + bigfloat2);
//operators
Console.WriteLine("BigFloat w/ operators : " + (((bigfloat3 * 12) ^ 2) - 15));
Console.WriteLine();
//additional methods
Console.WriteLine("Round(1234567.1234) = " + BigFloat.Round(bigfloat4));
Console.WriteLine("Ceil(1234567.1234) = " + BigFloat.Ceil(bigfloat4));
Console.WriteLine("Floor(1234567.1234) = " + BigFloat.Floor(bigfloat4));
Console.WriteLine("Inverse(1234567.1234) = " + BigFloat.Inverse(bigfloat4).ToString(20));
Console.WriteLine("Sqrt(1234567.1234) = " + BigFloat.Sqrt(bigfloat4));
Console.WriteLine("log10(1234567.1234) = " + BigFloat.Log10(bigfloat4));
//large numbers
BigFloat pi = new BigFloat("3.141592653589793238462643383279502884197169399375105820974944592307816406286208998628034825342117067982148086513282306647093844609550582231725359408128481117450284102701938521105559644622948954930381964428810975665933446128475648233786783165271201909145648566923460348610454326648213393607260249141273724587006606315588174881520920962829254091715364367892590360011330530548820466521384146951941511609433057270365759591953092186117381932611793105118548074462379962749567351885752724891227938183011949");
Console.WriteLine("\nPi to a really long decimal place:");
Console.WriteLine(pi.ToString(200));
Console.WriteLine("\nTau (2*PI): ");
Console.WriteLine((pi * 2).ToString(200));
Console.Read();
}
