.log()

The Math.log() method returns the natural logarithm of a number.

Syntax

Math.log(a);

• If a is a positive number, the return value is a double.
• If a is NaN or a negative number, the return value is NaN.
• If a is positive infinity, the return value is positive infinity.
• If a is positive or negative zero, the return value is negative infinity.

Example

The following example demonstrates using Math.log() to find natural logs:

import java.lang.Math;

public class Main {
  public static void main(String args[]) {
    double a = 10;
    double b = -6;
    double c = 0;
    double d = -0;

    System.out.println("The result of log(" + a + ") is: " + Math.log(a));
    System.out.println("The result of log(" + b + ") is: " + Math.log(b));
    System.out.println("The result of log(" + c + ") is: " + Math.log(c));
    System.out.println("The result of log(" + d + ") is: " + Math.log(d));
  }
}

This will produce the following output:

The result of log(10.0) is: 2.303
The result of log(-6.0) is: NaN
The result of log(0.0) is: -Infinity
The result of log(0.0) is: -Infinity