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Math.Log10 Method

Returns the base 10 logarithm of a specified number.

Namespace:  System
Assemblies:   mscorlib (in mscorlib.dll)
  System.Runtime.Extensions (in System.Runtime.Extensions.dll)

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.

d parameter

Return value

Positive

The base 10 log of d; that is, log 10 d.

Zero

NegativeInfinity

Negative

NaN

Equal to NaN

NaN

Equal to PositiveInfinity

PositiveInfinity

Parameter d is specified as a base 10 number.

The following example uses the Log10 method to return the base 10 logarithm for selected values.

using System;

public class Example
{
   public static void Main()
   {
      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.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Portable Class Library

Supported in: Portable Class Library
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