Java - Math getExponent(double) Method

Description

The Java Math getExponent(double d) returns the unbiased exponent used in the representation of a double. Special cases −

• If the argument is NaN or infinite, then the result is Double.MAX_EXPONENT + 1.

• If the argument is zero or subnormal, then the result is Double.MIN_EXPONENT -1.

Declaration

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

public static int getExponent(double d)

Parameters

d − a double value

Return Value

This method returns the unbiased exponent of the argument

Exception

NA

Getting Unbiased Exponent of a Positive Double Example

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

package com.tutorialspoint;

public class MathDemo {

   public static void main(String[] args) {

      // get a double number
      double x = 60984.1;

      // print the unbiased exponent of the number
      System.out.println("Math.getExponent(" + x + ")=" + Math.getExponent(x));
   }
}

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

Math.getExponent(60984.1)=15

Getting Unbiased Exponent of a Zero Double Example

The following example shows the usage of Math getExponent() method of zero value.

package com.tutorialspoint;

public class MathDemo {

   public static void main(String[] args) {

      // get a double number
      double x = 0.0;

      // print the unbiased exponent of the number
      System.out.println("Math.getExponent(" + x + ")=" + Math.getExponent(x));
   }
}

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

Math.getExponent(0.0)=-1023

Getting Unbiased Exponent of a Negative Double Example

The following example shows the usage of Math getExponent() method of a negative number.

package com.tutorialspoint;

public class MathDemo {

   public static void main(String[] args) {

      // get a double number
      double x = -497.99;

      // print the unbiased exponent of the number
      System.out.println("Math.getExponent(" + x + ")=" + Math.getExponent(x));
   }
}

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

Math.getExponent(-497.99)=8