Math.Log10(Double) Metodo

Definizione

Restituisce il logaritmo in base 10 del numero specificato.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

Parametri

d
Double

Numero di cui trovare il logaritmo.A number whose logarithm is to be found.

Restituisce

Uno dei valori della tabella seguente.One of the values in the following table.

Parametro d.d parameter Valore restituitoReturn value
PositivoPositive Logaritmo in base 10 di d: log 10d.The base 10 log of d; that is, log 10d.
ZeroZero NegativeInfinity
NegativoNegative NaN
Uguale a NaNEqual to NaNNaN
Uguale a PositiveInfinityEqual to PositiveInfinityPositiveInfinity

Esempio

Nell'esempio seguente viene usato il metodo Log10 per restituire il logaritmo in base 10 per i valori selezionati.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.

Commenti

Il parametro d viene specificato come numero base 10.Parameter d is specified as a base 10 number.

Si applica a