Java Math getExponent() Method

The getExponent() method of Math class returns the unbiased exponent of the argument.

Syntax:

public static int getExponent (double d)

Parameters:

The parameter ‘d’ represents the double value.

Return Value:

The getExponent () method returns the unbiased exponent used in the representation of a double.

Special cases are as follows:

• It returns Double.MAX_EXPONENT+1, if the argument is NaN or infinite.
• It returns Double.MIN_EXPONENT-1, if the argument is zero or subnormal.

Example 1:

public class JavaMathGetExponentExample1 {
    public static void main(String[] args) {
        double a = 20;
        //returns the unbiased exponent of the argument
        System.out.println(Math.getExponent(a));
    }
}

Output:

4

Example 2:

public class JavaMathGetExponentExample2 {
    public static void main(String[] args) {
        double x=0.0d;
        //It returns Double.MIN_EXPONENT-1, if the argument is zero or subnormal.
        System.out.println(" Unbiased exponent of "+ x+" =
"+Math.getExponent(x));
    }
}

Output:

Unbiased exponent of 0.0 = -1023

Example 3:

public class JavaMathGetExponentExample3 {
    public static void main(String[] args) {
        float x=0.0f/0.0f;
        //It returns Double.MAX_EXPONENT+1, if the argument is NaN or infinite
        System.out.println(" Unbiased exponent of "+ x+" =
"+Math.getExponent(x));
    }
}

Output:

Unbiased exponent of NaN = 128

Example 4:

public class JavaMathGetExponentExample4 {
    public static void main(String[] args) {
        float x=8.0f/0.0f;
        //It returns Double.MAX_EXPONENT+1, if the argument is NaN or infinite
        System.out.println(" Unbiased exponent of "+ x+" =
"+Math.getExponent(x));
    }
}

Output:

Unbiased exponent of Infinity = 128