Class DoubleBits

DoubleBits manipulates Double numbers by using bit manipulation and bit-field extraction. For some operations (such as determining the exponent) this is more accurate than using mathematical operations (which suffer from round-off error). The algorithms and constants in this class apply only to IEEE-754 double-precision floating point format.
Inheritance
System.Object
DoubleBits
Inherited Members
System.Object.Equals(System.Object)
System.Object.Equals(System.Object, System.Object)
System.Object.GetHashCode()
System.Object.GetType()
System.Object.MemberwiseClone()
System.Object.ReferenceEquals(System.Object, System.Object)
Namespace: Mars.Common.Collections
Assembly: Mars.Common.dll
Syntax
public class DoubleBits

Constructors

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DoubleBits(Double)

Declaration
public DoubleBits(double x)
Parameters
Type Name Description
System.Double x

Fields

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ExponentBias

Declaration
public const int ExponentBias = 1023
Field Value
Type Description
System.Int32

Properties

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BiasedExponent

Determines the exponent for the number.
Declaration
public int BiasedExponent { get; }
Property Value
Type Description
System.Int32
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Double

Declaration
public double Double { get; }
Property Value
Type Description
System.Double
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Exponent

Determines the exponent for the number.
Declaration
public int Exponent { get; }
Property Value
Type Description
System.Int32

Methods

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GetBit(Int32)

Declaration
public int GetBit(int i)
Parameters
Type Name Description
System.Int32 i
Returns
Type Description
System.Int32
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GetExponent(Double)

Declaration
public static int GetExponent(double d)
Parameters
Type Name Description
System.Double d
Returns
Type Description
System.Int32
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MaximumCommonMantissa(Double, Double)

Declaration
public static double MaximumCommonMantissa(double d1, double d2)
Parameters
Type Name Description
System.Double d1
System.Double d2
Returns
Type Description
System.Double
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NumCommonMantissaBits(DoubleBits)

This computes the number of common most-significant bits in the mantissa. It does not count the hidden bit, which is always 1. It does not determine whether the numbers have the same exponent - if they do not, the value computed by this function is meaningless.
Declaration
public int NumCommonMantissaBits(DoubleBits db)
Parameters
Type Name Description
DoubleBits db
Returns
Type Description
System.Int32 The number of common most-significant mantissa bits.
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PowerOf2(Int32)

Declaration
public static double PowerOf2(int exp)
Parameters
Type Name Description
System.Int32 exp
Returns
Type Description
System.Double
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ToBinaryString(Double)

Declaration
public static string ToBinaryString(double d)
Parameters
Type Name Description
System.Double d
Returns
Type Description
System.String
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ToString()

A representation of the Double bits formatted for easy readability.
Declaration
public override string ToString()
Returns
Type Description
System.String
Overrides
System.Object.ToString()
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TruncateToPowerOfTwo(Double)

Declaration
public static double TruncateToPowerOfTwo(double d)
Parameters
Type Name Description
System.Double d
Returns
Type Description
System.Double
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ZeroLowerBits(Int32)

Declaration
public void ZeroLowerBits(int nBits)
Parameters
Type Name Description
System.Int32 nBits

Extension Methods