Java Math getExponent() method with Example

The java.lang.Math.getExponent() returns the unbiased exponent used in the representation of a double or float.
Note:

• If the argument is NaN or infinite of double or float type, then the result is (Double.MAX_EXPONENT + 1) or (Float.MAX_EXPONENT + 1).
• If the argument is zero or subnormal of double or float type, then the result is (Double.MIN_EXPONENT -1) or (Float.MIN_EXPONENT -1).

Syntax :

public static int getExponent(DataType a)
Parameter :
a : an argument of double or float type
Return :
This method returns the unbiased exponent of the argument.

// Java program to demonstrate working
// of java.lang.Math.getExponent() method
import java.lang.Math;

class Gfg {

    // driver code
    public static void main(String args[])
    {
        double a = 345.65;
        double b = 1.0 / 0;
        double c = 0;

        // Input double value
        // Output unbiased exponent of it
        System.out.println(Math.getExponent(a));

        // Input Infinity
        // Output (Double.MAX_EXPONENT + 1)
        System.out.println(Math.getExponent(b));

        // Input Zero
        // Output (Double.MIN_EXPONENT - 1)
        System.out.println(Math.getExponent(c));

        float d = 237.2f;
        float e = 1.0f / 0;
        float f = 0f;

        // Input float value
        // Output unbiased exponent of it
        System.out.println(Math.getExponent(d));

        // Input Infinity
        // Output (Float.MAX_EXPONENT + 1)
        System.out.println(Math.getExponent(e));

        // Input Zero
        // Output (Float.MIN_EXPONENT - 1)
        System.out.println(Math.getExponent(f));
    }
}

Output:

8
1024
-1023
7
128
-127