BigIntegerMath floorPowerOfTwo() function | Guava | Java
The method floorPowerOfTwo(BigInteger x) of Guava’s BigIntegerMath class returns the largest power of two less than or equal to x. This is equivalent to BigInteger.valueOf(2).pow(log2(x, FLOOR)).
Syntax:
public static BigInteger floorPowerOfTwo(BigInteger x)
Parameters: This method takes the BigInteger x as parameter whose floor power of two is to be found.
Return Value: This method returns the largest power of two less than or equal to x.
Exceptions: This method throws IllegalArgumentException if x <= 0.
Below examples illustrates the BigIntegerMath.floorPowerOfTwo() method:
Example 1:
Java
import java.math.*;
import com.google.common.math.BigIntegerMath;
class GFG {
public static void main(String args[])
{
BigInteger n1 = BigInteger.valueOf( 10 );
BigInteger
ans1
= BigIntegerMath.floorPowerOfTwo(n1);
System.out.println( "Largest power of 2 less "
+ "than or equal to " + n1
+ " is: " + ans1);
BigInteger n2 = BigInteger.valueOf( 127 );
BigInteger
ans2
= BigIntegerMath.floorPowerOfTwo(n2);
System.out.println( "Largest power of 2 less "
+ "than or equal to " + n2
+ " is: " + ans2);
}
}
|
Output:
Largest power of 2 less than or equal to 10 is: 8
Largest power of 2 less than or equal to 127 is: 64
Example 2: To show IllegalArgumentException
Java
import java.math.*;
import com.google.common.math.BigIntegerMath;
class GFG {
public static void main(String args[])
{
try {
BigInteger n1 = BigInteger.valueOf(- 3 );
BigInteger
ans1
= BigIntegerMath.floorPowerOfTwo(n1);
System.out.println( "Largest power of 2 less "
+ "than or equal to " + n1
+ " is: " + ans1);
}
catch (Exception e) {
System.out.println( "Exception: " + e);
}
}
}
|
Output:
Exception: java.lang.IllegalArgumentException: x (-3) must be > 0
Reference: https://google.github.io/guava/releases/21.0/api/docs/com/google/common/math/BigIntegerMath.html#floorPowerOfTwo-java.math.BigInteger-
Last Updated :
26 Jul, 2021
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