# Math.Log10 Method (Double)

.NET Framework (current version)

Returns the base 10 logarithm of a specified number.

Namespace:   System
Assembly:  mscorlib (in mscorlib.dll)

## Syntax

```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 10d.

Zero

NegativeInfinity

Negative

NaN

Equal to NaN

NaN

Equal to PositiveInfinity

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.

```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.
```

## Version Information

Universal Windows Platform
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1