JcBernack

using System;
using System.Numerics;

namespace Common
{
    /// <summary>
    /// Arbitrary precision decimal.
    /// All operations are exact, except for division. Division never determines more digits than the given precision.
    /// Source: https://gist.github.com/JcBernack/0b4eef59ca97ee931a2f45542b9ff06d
    /// Based on https://stackoverflow.com/a/4524254

JcBernack

/// <summary>
/// Fast exponential approximation.
/// </summary>
/// <remarks>
/// Based on "A Fast, Compact Approximation of the Exponential Function" by Nicol N.Schraudolph (1999)
/// <code>e^x ~ a*x + b
/// a = 2 ^ (mantissa bits) / ln(2) ~ 12102203
/// b = (exponent bias) * 2^(mantissa bits) ~ 1065353216</code>
/// </remarks>
/// <param name="x">A number specifying a power.</param>