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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