C# |数学。Log10()方法

原文:https://www.geeksforgeeks.org/c-sharp-math-log10-method/

在 C# 中 数学。log10()是一种数学类方法。它用于返回指定数字的以 10 为底的对数。

语法:

public static double Log10(double val)

参数:

val: 是要计算对数的指定数字，类型为系统。双。

返回值:返回值的对数(以值的 10 个对数为基数)，类型为系统。双。

注意:参数值始终指定为基数 10。返回值取决于传递的参数。以下是一些情况:

  • If the parameter is plus , then the method will return the natural logarithm or logarithm 10 (val) .
  • If the parameter is zero , the result is negative finite .
  • If the independent variable is negative (less than zero) or equal to nan , the result is nan .
  • If the parameter is positive definite , the result is positive definite .
  • If the independent variable is negative infinity , then the result is nan .

例:

// C# program to demonstrate working
// of Math.Log10(Double) method
using System;

class Geeks {

    // Main Method
    public static void Main(String[] args)
    {

        // double values whose logarithm 
        // to be calculated
        double a = 4.55;
        double b = 0;
        double c = -2.45;
        double nan = Double.NaN;
        double positiveInfinity = Double.PositiveInfinity;     
        double negativeInfinity = Double.NegativeInfinity;

        // Input is positive number so output
        // will be logarithm of number
        Console.WriteLine(Math.Log10(a));

        // positive zero as argument, so output 
        // will be -Infinity
        Console.WriteLine(Math.Log10(b));

        // Input is negative number so output
        // will be NaN
        Console.WriteLine(Math.Log10(c));

        // Input is NaN so output
        // will be NaN
        Console.WriteLine(Math.Log10(nan));

        // Input is PositiveInfinity so output
        // will be Infinity
        Console.WriteLine(Math.Log10(positiveInfinity));

        // Input is NegativeInfinity so output
        // will be NaN
        Console.WriteLine(Math.Log10(negativeInfinity));
    }
}

输出:

0.658011396657112
-Infinity
NaN
NaN
Infinity
NaN

参考:https://msdn . Microsoft . com/en-us/library/system . math . log 10(v = vs . 110)。aspx

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