Math.Log10(Double) Methode

Definition

Gibt den Logarithmus einer angegebenen Zahl zur Basis 10 zurück.Returns the base 10 logarithm of a specified number.

public:
 static double Log10(double d);
public static double Log10 (double d);
static member Log10 : double -> double
Public Shared Function Log10 (d As Double) As Double

Parameter

d
Double

Eine Zahl, deren Logarithmus gesucht wird.A number whose logarithm is to be found.

Gibt zurück

Double

Einer der Werte aus der folgenden Tabelle.One of the values in the following table.

d-Parameterd parameter RückgabewertReturn value
PositivPositive Der Logarithmus von d zur Basis 10, d.h. log 10d.The base 10 log of d; that is, log 10d.
ZeroZero NegativeInfinity
NegativNegative NaN
Gleich NaNEqual to NaNNaN
Gleich PositiveInfinityEqual to PositiveInfinityPositiveInfinity

Beispiele

Im folgenden Beispiel wird die- Log10 Methode verwendet, um den Logarithmus zur Basis 10 für ausgewählte Werte zurückzugeben.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.
Module Example
   Public Sub Main()
      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.

Hinweise

Der Parameter d wird als Basis 10-Nummer angegeben.Parameter d is specified as a base 10 number.

Diese Methode ruft die zugrunde liegende C-Laufzeit auf, und das genaue Ergebnis oder der gültige Eingabebereich kann sich zwischen verschiedenen Betriebssystemen oder Architekturen unterscheiden.This method calls into the underlying C runtime, and the exact result or valid input range may differ between different operating systems or architectures.

Gilt für: