Math.Log10(Double) Metode

Definisi

Ruang nama:

System

Rakitan:

System.Runtime.dll

Sumber:

Math.cs

Mengembalikan logaritma basis 10 dari angka tertentu.

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

Angka yang logaritmanya akan ditemukan.

Mengembalikan

Double

Salah satu nilai dalam tabel berikut ini.

parameter d	Mengembalikan nilai
Positif	Log dasar 10 dari d; yaitu, log 10d.
Nol	NegativeInfinity
Negatif	NaN
Sama dengan NaN	NaN
Sama dengan PositiveInfinity	PositiveInfinity

Contoh

Contoh berikut menggunakan Log10 metode untuk mengembalikan logaritma dasar 10 untuk nilai yang dipilih.

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.

open System

let numbers =
    [ -1.; 0; 0.105; 0.5; 0.798; 1; 4; 6.9; 10
      50; 100; 500; 1000; Double.MaxValue ]

for number in numbers do
    // the F# log10 function may be used instead
    printfn $"The base 10 log of {number} is {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.

Keterangan

Parameter d ditentukan sebagai angka dasar 10.

Metode ini memanggil runtime C yang mendasarinya, dan hasil yang tepat atau rentang input yang valid mungkin berbeda antara sistem operasi atau arsitektur yang berbeda.