Math.Log10 Method
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Returns the base 10 logarithm of a specified number.
Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
<SecuritySafeCriticalAttribute> _
Public Shared Function Log10 ( _
d As Double _
) As Double
[SecuritySafeCriticalAttribute]
public static double Log10(
double d
)
Parameters
- d
Type: System.Double
A number whose logarithm is to be found.
Return Value
Type: System.Double
One of the values in the following table.
Sign of d |
Returns |
|---|---|
Positive |
The base 10 log of d; that is, log 10d. |
Zero |
|
Negative |
|
Equal to NaN |
|
Equal to PositiveInfinity |
Remarks
Parameter d is specified as a base 10 number.
Examples
The following example uses the Log10 method to return the base 10 logarithm for selected values.
Module Example
Public Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
Dim numbers() As Double = {-1, 0, .105, .5, .798, 1, 4, 6.9, 10, 50, _
100, 500, 1000, Double.MaxValue}
For Each number As Double In numbers
Console.WriteLine("The base 10 log of {0} is {1}.", _
number, Math.Log10(number))
Next
End Sub
End Module
' The example displays the following output:
' The base 10 log of -1 is NaN.
' The base 10 log of 0 is -Infinity.
' The base 10 log of 0.105 is -0.978810700930062.
' The base 10 log of 0.5 is -0.301029995663981.
' The base 10 log of 0.798 is -0.0979971086492706.
' The base 10 log of 1 is 0.
' The base 10 log of 4 is 0.602059991327962.
' The base 10 log of 6.9 is 0.838849090737255.
' The base 10 log of 10 is 1.
' The base 10 log of 50 is 1.69897000433602.
' The base 10 log of 100 is 2.
' The base 10 log of 500 is 2.69897000433602.
' The base 10 log of 1000 is 3.
' The base 10 log of 1.79769313486232E+308 is 308.254715559917.
using System;
class Example
{
public static void Demo(System.Windows.Controls.TextBlock outputBlock)
{
double[] numbers = {-1, 0, .105, .5, .798, 1, 4, 6.9, 10, 50,
100, 500, 1000, Double.MaxValue};
foreach (double number in numbers)
Console.WriteLine("The base 10 log of {0} is {1}.",
number, Math.Log10(number));
}
}
// The example dislays the following output:
// The base 10 log of -1 is NaN.
// The base 10 log of 0 is -Infinity.
// The base 10 log of 0.105 is -0.978810700930062.
// The base 10 log of 0.5 is -0.301029995663981.
// The base 10 log of 0.798 is -0.0979971086492706.
// The base 10 log of 1 is 0.
// The base 10 log of 4 is 0.602059991327962.
// The base 10 log of 6.9 is 0.838849090737255.
// The base 10 log of 10 is 1.
// The base 10 log of 50 is 1.69897000433602.
// The base 10 log of 100 is 2.
// The base 10 log of 500 is 2.69897000433602.
// The base 10 log of 1000 is 3.
// The base 10 log of 1.79769313486232E+308 is 308.254715559917.
Version Information
Silverlight
Supported in: 5, 4, 3
Silverlight for Windows Phone
Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0
XNA Framework
Supported in: Xbox 360, Windows Phone OS 7.0
Platforms
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.