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.

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



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