Innovenergy_trunk/csharp/lib/Utils/DecimalUtils.cs

using DecimalMath;

namespace InnovEnergy.Lib.Utils;

public static class DecimalUtils
{
    public static Double RoundToSignificantFigures(this Double num, Int32 n)
    {
        if (num == 0)
            return 0;

        var d = Math.Ceiling(Math.Log10(num < 0 ? -num : num));
        var power = n - (Int32)d;

        var magnitude = Math.Pow(10, power);
        var shifted = Math.Round(num * magnitude);
        return shifted / magnitude;
    }
    
    public static Decimal RoundToSignificantFigures(this Decimal num, Int32 n)
    {
        if (num == 0)
            return 0;

        var d = Math.Ceiling(DecimalEx.Log10(num < 0 ? -num : num));
        var power = n - (Int32)d;

        var magnitude = DecimalEx.Pow(10, power);
        var shifted = Math.Round(num * magnitude);
        return shifted / magnitude;
    }
}