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Guava - BigIntegerMath Class
BigIntegerMath provides utility methods on BigInteger.
Class Declaration
Following is the declaration for com.google.common.math.BigIntegerMath class −
@GwtCompatible(emulated = true) public final class BigIntegerMath extends Object
Methods
Sr.No | Method & Description |
---|---|
1 |
static BigInteger binomial(int n, int k) Returns n choose k, also known as the binomial coefficient of n and k, that is, n! / (k! (n - k)!). |
2 | static BigInteger divide(BigInteger p, BigInteger q, RoundingMode mode) Returns the result of dividing p by q, rounding using the specified RoundingMode. |
3 |
static BigInteger factorial(int n) Returns n!, that is, the product of the first n positive integers, or 1 if n == 0. |
4 |
static boolean isPowerOfTwo(BigInteger x) Returns true if x represents a power of two. |
5 |
static int log10(BigInteger x, RoundingMode mode) Returns the base-10 logarithm of x, rounded according to the specified rounding mode. |
6 |
static int log2(BigInteger x, RoundingMode mode) Returns the base-2 logarithm of x, rounded according to the specified rounding mode. |
7 |
static BigInteger sqrt(BigInteger x, RoundingMode mode) Returns the square root of x, rounded with the specified rounding mode. |
Methods Inherited
This class inherits methods from the following class −
- java.lang.Object
Example of BigIntegerMath Class
Create the following java program using any editor of your choice in say C:/> Guava.
GuavaTester.java
import java.math.BigInteger; import java.math.RoundingMode; import com.google.common.math.BigIntegerMath; public class GuavaTester { public static void main(String args[]) { GuavaTester tester = new GuavaTester(); tester.testBigIntegerMath(); } private void testBigIntegerMath() { System.out.println(BigIntegerMath.divide(BigInteger.TEN, new BigInteger("2"), RoundingMode.UNNECESSARY)); try { //exception will be thrown as 100 is not completely divisible by 3 // thus rounding is required, and RoundingMode is set as UNNESSARY System.out.println(BigIntegerMath.divide(BigInteger.TEN, new BigInteger("3"), RoundingMode.UNNECESSARY)); } catch(ArithmeticException e) { System.out.println("Error: " + e.getMessage()); } System.out.println("Log2(2): " + BigIntegerMath.log2(new BigInteger("2"), RoundingMode.HALF_EVEN)); System.out.println("Log10(10): " + BigIntegerMath.log10(BigInteger.TEN, RoundingMode.HALF_EVEN)); System.out.println("sqrt(100): " + BigIntegerMath.sqrt(BigInteger.TEN.multiply(BigInteger.TEN), RoundingMode.HALF_EVEN)); System.out.println("factorial(5): "+BigIntegerMath.factorial(5)); } }
Verify the Result
Compile the class using javac compiler as follows −
C:\Guava>javac GuavaTester.java
Now run the GuavaTester to see the result.
C:\Guava>java GuavaTester
See the result.
5 Error: Rounding necessary Log2(2): 1 Log10(10): 1 sqrt(100): 10 factorial(5): 120
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