Java.lang.Math.log() Method


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Description

The java.lang.Math.log(double a) returns the natural logarithm (base e) of a double value. Special cases:

  • If the argument is NaN or less than zero, then the result is NaN.

  • If the argument is positive infinity, then the result is positive infinity.

  • If the argument is positive zero or negative zero, then the result is negative infinity.

Declaration

Following is the declaration for java.lang.Math.log() method

public static double log(double a)

Parameters

a − a value

Return Value

This method returns the value ln a, the natural logarithm of a.

Exception

NA

Example

The following example shows the usage of lang.Math.log() method.

Live Demo
package com.tutorialspoint;

import java.lang.*;

public class MathDemo {

   public static void main(String[] args) {

      // get two double numbers
      double x = 60984.1;
      double y = -497.99;
   
      // get the natural logarithm for x
      System.out.println("Math.log(" + x + ")=" + Math.log(x));
   
      // get the natural logarithm for y
      System.out.println("Math.log(" + y + ")=" + Math.log(y));
   }
}

Let us compile and run the above program, this will produce the following result −

Math.log(60984.1)=11.018368453441132
Math.log(-497.99)=NaN

java_lang_math.htm

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