BigIntegerMath log2() function | Guava | Java

// Java code to show implementation of
// log2(BigInteger x, RoundingMode mode) method
// of Guava's BigIntegerMath class

import java.math.*;
import com.google.common.math.BigIntegerMath;

class GFG {

    // Driver code
    public static void main(String args[])
    {
        BigInteger a1 = BigInteger.valueOf(1024);

        // Using log2(BigInteger x, RoundingMode mode)
        // method of Guava's BigIntegerMath class
        // The RoundingMode HALF_EVEN rounds towards
        // the "nearest neighbor" unless both neighbors
        // are equidistant, in which case, round towards
        // the even neighbor.
        System.out.println("Log base 2 of " + a1
                           + " with rounding mode HALF_EVEN = "
                           + BigIntegerMath
                                 .log2(a1,
                                        RoundingMode.HALF_EVEN));

        BigInteger a2 = BigInteger.valueOf(15);

        // Using log2(BigInteger x, RoundingMode mode)
        // method of Guava's BigIntegerMath class
        // The RoundingMode HALF_DOWN rounds towards
        // "nearest neighbor" unless both neighbors
        // are equidistant, in which case round down.
        System.out.println("Log base 2 of " + a2
                           + " with rounding mode HALF_DOWN = "
                           + BigIntegerMath
                                 .log10(a2,
                                        RoundingMode.HALF_DOWN));
    }
}

// Java code to show implementation of
// log2(BigInteger x, RoundingMode mode) method
// of Guava's BigIntegerMath class

import java.math.*;
import com.google.common.math.BigIntegerMath;

class GFG {

    // Driver code
    public static void main(String args[])
    {

        try {
            BigInteger a1 = BigInteger.valueOf(-5);

            // Using log2(BigInteger x, RoundingMode mode)
            // method of Guava's BigIntegerMath class
            // The RoundingMode HALF_EVEN rounds towards
            // the "nearest neighbor" unless both neighbors
            // are equidistant, in which case, round towards
            // the even neighbor.
            // This should throw "IllegalArgumentException"
            // as a1 <= 0
            System.out.println("Log base 2 of " + a1
                               + " with rounding mode HALF_EVEN = "
                               + BigIntegerMath
                                     .log2(a1,
                                            RoundingMode.HALF_EVEN));
        }

        catch (Exception e) {
            System.out.println("Exception: " + e);
        }
    }
}