Java Math.getExponent() Method

Java Math.getExponent() method returns unbiased exponent used in the representation of the argument. This method can accept double and float arguments.

public class JavaExample
{
  public static void main(String[] args)
  {
    double x = Double.POSITIVE_INFINITY;
    // Returns Double.MAX_EXPONENT+1
    System.out.println(Math.getExponent(x));
  }
}

Output:

1024

Syntax of Math.getExponent() method

public static int getExponent(double d)
public static int getExponent(float f)

getExponent() Description

It returns the unbiased exponent used in the representation of arguments d (for double argument variant) and f (for float argument variant of this method).

getExponent() Parameters

• d: A double value
• f: A float value

getExponent() Return Value

• Returns unbiased exponent of the argument.
• If the argument d is zero, then it returns Double.MIN_EXPONENT - 1.
• If the argument f is zero, then it returns Float.MIN_EXPONENT - 1.
• If the argument d is NaN or infinite, then it returns Double.MAX_EXPONENT - 1.
• If the argument f is NaN or infinite, then it returns Float.MAX_EXPONENT - 1.

Example 1

public class JavaExample
{
  public static void main(String[] args)
  {
    double d = 101.11;
    float f = 12.55f;
    System.out.println(Math.getExponent(d));
    System.out.println(Math.getExponent(f));
  }
}

Output:

Example 2

public class JavaExample
{
  public static void main(String[] args)
  {
    double d = Double.NaN;
    float f = 0.0f;
    System.out.println(Math.getExponent(d));
    System.out.println(Math.getExponent(f));
  }
}

Output:

Example 3

public class JavaExample
{
  public static void main(String[] args)
  {
    double d = Double.MAX_VALUE;
    float f = Float.POSITIVE_INFINITY;
    System.out.println(Math.getExponent(d));
    System.out.println(Math.getExponent(f));
  }
}

Output:

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