BigIntegerMath ceilingPowerOfTwo() function | Guava | Java
Last Updated :
03 Aug, 2021
The ceilingPowerOfTwo(BigInteger x) method of Guava’s BigIntegerMath class returns the smallest power of two greater than or equal to x. This is equivalent to BigInteger.valueOf(2).pow(log2(x, CEILING)).
Syntax:
public static BigInteger
ceilingPowerOfTwo(BigInteger x)
Parameters: This method takes the number x as parameter whose ceiling power of two is to be found.
Return Value: This method returns the ceiling power of two of the given number x.
Exceptions: This method throws IllegalArgumentException if x <= 0.
Below examples illustrates the BigIntegerMath.ceilingPowerOfTwo() method:
Example 1:
import java.math.*;
import com.google.common.math.BigIntegerMath;
class GFG {
public static void main(String args[])
{
BigInteger n1 = BigInteger.valueOf( 25 );
BigInteger ans = BigIntegerMath.ceilingPowerOfTwo(n1);
System.out.println( "Smallest power of 2 greater "
+ "than or equal to "
+ n1 + " is: " + ans);
BigInteger n2 = BigInteger.valueOf( 65 );
BigInteger ans1 = BigIntegerMath.ceilingPowerOfTwo(n2);
System.out.println( "Smallest power of 2 greater "
+ "than or equal to "
+ n2 + " is: " + ans1);
}
}
|
Output:
Smallest power of 2 greater than or equal to 25 is: 32
Smallest power of 2 greater than or equal to 65 is: 128
Example 2:
import java.math.*;
import com.google.common.math.BigIntegerMath;
class GFG {
public static void main(String args[])
{
try {
BigInteger n = BigInteger.valueOf( 0 );
BigInteger ans = BigIntegerMath.ceilingPowerOfTwo(n);
System.out.println( "Smallest power of 2 greater "
+ "than or equal to n is : " + ans);
}
catch (Exception e) {
System.out.println( "Exception: " + e);
}
}
}
|
Output:
Exception: java.lang.IllegalArgumentException: x (0) must be > 0
Reference: https://google.github.io/guava/releases/21.0/api/docs/com/google/common/math/BigIntegerMath.html#ceilingPowerOfTwo-java.math.BigInteger-
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