The binomial(int n, int k) method of Guava’s LongMath Class accepts two parameters n and k and calculate the value of the binomial coefficient 
. If the calculated value overflows the maximum value of a long, then the method returns Long.MAX_VALUE i.e, the maximum value of a long.
Syntax :
public static long binomial(int n, int k)
Parameters: This method accepts two parameters n and k and calculate the value of the binomial coefficient .
Return Value : The method returns the binomial coefficient of n and k.
Exceptions : The method binomial(int n, int k) throws IllegalArgumentException if n is negative, or k is negative or k is greater than n.
Below examples illustrate the binomial() method of LongMath class:
Example 1 :
// Java code to show implementation of// binomial(int n, int k) method of Guava's// LongMath classimport java.math.RoundingMode;import com.google.common.math.LongMath; class GFG { // Driver code public static void main(String args[]) { int n = 4; int k = 3; // Using binomial(int n, int k) method of // Guava's LongMath class long ans = LongMath.binomial(n, k); System.out.println("Binomial Coefficient of " + n + " and " + k + " is : " + ans); int n1 = 20; int k1 = 4; // Using binomial(int n, int k) method of // Guava's LongMath class long ans1 = LongMath.binomial(n1, k1); System.out.println("Binomial Coefficient of " + n1 + " and " + k1 + " is : " + ans1); }} |
Binomial Coefficient of 4 and 3 is : 4 Binomial Coefficient of 20 and 4 is : 4845
Example 2 :
// Java code to show implementation of// binomial(int n, int k) method of Guava's// LongMath class import java.math.RoundingMode;import com.google.common.math.LongMath; class GFG { static long findBinomial(int n, int k) { try { // Using binomial(int n, int k) // method of Guava's LongMath class // This should throw "IllegalArgumentException" // as k < 0 long ans = LongMath.binomial(n, k); // Return the answer return ans; } catch (Exception e) { System.out.println(e); return -1; } } // Driver code public static void main(String args[]) { int n = 5; int k = 7; try { // Function calling findBinomial(n, k); } catch (Exception e) { System.out.println(e); } }} |
java.lang.IllegalArgumentException: k (7) > n (5)
Reference : https://google.github.io/guava/releases/20.0/api/docs/com/google/common/math/LongMath.html#binomial-int-int-