Math.ILogB(Double) Method

Reference

Definition

Namespace:: System

Assemblies:: netstandard.dll, System.Runtime.dll

Assembly:: System.Runtime.Extensions.dll

Source:: Math.cs

Source:: Math.cs

Source:: Math.cs

Important

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Returns the base 2 integer logarithm of a specified number.

public:
 static int ILogB(double x);

public static int ILogB(double x);

static member ILogB : double -> int

Public Shared Function ILogB (x As Double) As Integer

Parameters

x: Double

The number whose logarithm is to be found.

Returns

Int32

One of the values in the following table.

`x` parameter	Return value
Default	The base 2 integer log of `x`; that is, (int)log2(`x`).
Zero	Int32.MinValue
Equal to NaN or PositiveInfinity or NegativeInfinity	Int32.MaxValue

Remarks

Parameter x is specified as a base 10 number.

This method calls into the underlying C runtime, and the exact result or valid input range may differ between different operating systems or architectures.

Applies to

Product	Versions
.NET	Core 3.0, Core 3.1, 5, 6, 7, 8, 9, 10

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