Open In App
Related Articles

BigIntegerMath ceilingPowerOfTwo() function | Guava | Java

Improve
Improve
Improve
Like Article
Like
Save Article
Save
Share
Report issue
Report
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:
// Java code to show implementation of
// ceilingPowerOfTwo(BigInteger x) 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 n1 = BigInteger.valueOf(25);
  
        // Using ceilingPowerOfTwo(BigInteger x) method of
        // Guava's BigIntegerMath class
        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);
  
        // Using ceilingPowerOfTwo(BigInteger x) method of
        // Guava's BigIntegerMath class
        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:
// Java code to show implementation of
// ceilingPowerOfTwo(BigInteger x) 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 n = BigInteger.valueOf(0);
  
            // Using ceilingPowerOfTwo(BigInteger x) method of
            // Guava's BigIntegerMath class
            // This should raise "IllegalArgumentException"
            // as n is <= 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-

Last Updated : 03 Aug, 2021
Like Article
Save Article
Previous
Next
Share your thoughts in the comments
Similar Reads
Complete Tutorials