Java Math log()

The log() method computes the natural logarithm (base e) of the specified value and returns it.


class Main {
  public static void main(String[] args) {

// compute log() of 9 System.out.println(Math.log(9.0));
} } // Output: 2.1972245773362196

Syntax of Math.log()

The syntax of the log() method is:

Math.log(double x)

Here, log() is a static method. Hence, we are calling the method directly using the class name Math.

log() Parameters

  • x - the value whose logarithm is to be computed

log() Return Values

  • returns the natural logarithm of x (i.e. ln a)
  • returns NaN if the argument is NaN or less than zero
  • returns positive infinity if the argument is positive infinity
  • returns negative infinity if the argument is zero

Example: Java Math.log()

class Main {
  public static void main(String[] args) {

    // compute log() for double value
    System.out.println(Math.log(9.0));       // 2.1972245773362196

    // compute log() for zero
System.out.println(Math.log(0.0)); // -Infinity
// compute log() for NaN double nanValue = Math.sqrt(-5.0);
System.out.println(Math.log(nanValue)); // NaN
// compute log() for infinity double infinity = Double.POSITIVE_INFINITY;
System.out.println(Math.log(infinity)); // Infinity
// compute log() for negative numbers
System.out.println(Math.log(-9.0)); // NaN
} }

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