Java Math log()方法示例

原文:https://www.geeksforgeeks.org/java-math-log-method-example/

java.lang.Math.log() 方法返回一个双精度值的自然对数(以 e 为底)作为参数。有各种情况:

  • If the argument is nan or less than zero , then the result is nan .
  • If the independent variable is positive infinity , then the result is positive infinity .
  • If the independent variable is positive zero or negative zero , the result is negative infinity .

语法:

public static double log(double a)

参数:

a : User input

返回:

This method returns the value ln a.

例:展示 java.lang.Math.log() 方法的工作。

// Java program to demonstrate working
// of java.lang.Math.log() method
import java.lang.Math;

class Gfg {

    // driver code
    public static void main(String args[])
    {

        double a = -2.55;
        double b = 1.0 / 0;
        double c = 0, d = 145.256;

        // negative integer as argument, output NAN
        System.out.println(Math.log(a));

        // positive infinity as argument, output Infinity
        System.out.println(Math.log(b));

        // positive zero as argument, output -Infinity
        System.out.println(Math.log(c));

        // positive double as argument
        System.out.println(Math.log(d));

    }
}

输出:

NaN
Infinity
-Infinity
4.978497702968366

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