Open In App

Java Guava | gcd(long a, long b) of LongMath Class with Examples

Improve
Improve
Like Article
Like
Save
Share
Report

The method gcd(long a, long b) of Guava’s LongMath Class returns the greatest common divisor of two parameters a and b.

Syntax:

public static long gcd(long a, long b)

Parameters: This method accepts two parameters a and b of the long type of whose GCD is to be found.

Return Type: This method returns the largest positive long value that divides both of the parameters passed to the function.

Exceptions: The method gcd(long a, long b) throws IllegalArgumentException if a is negative or b is negative.

Note: If a and b both are zero, the method returns zero.

Example 1:




// Java code to show implementation of
// gcd(long a, long b) method of Guava's
// LongMath class
  
import java.math.RoundingMode;
import com.google.common.math.LongMath;
  
class GFG {
  
    // Driver code
    public static void main(String args[])
    {
        long a1 = 14;
        long b1 = 70;
  
        // Using gcd(long a, long b) method
        // of Guava's LongMath class
        long ans1 = LongMath.gcd(a1, b1);
  
        System.out.println("GCD of " + a1
                           + " and " + b1
                           + " is " + ans1);
  
        long a2 = 23;
        long b2 = 15;
  
        // Using gcd(long a, long b) method
        // of Guava's LongMath class
        long ans2 = LongMath.gcd(a2, b2);
  
        System.out.println("GCD of " + a2
                           + " and " + b2
                           + " is " + ans2);
    }
}


Output:

GCD of 14 and 70 is 14
GCD of 23 and 15 is 1

Example 2:




// Java code to show implementation of
// gcd(long a, long b) method of Guava's
// LongMath class
  
import java.math.RoundingMode;
import com.google.common.math.LongMath;
  
class GFG {
  
    // Driver code
    public static void main(String args[])
    {
        long a = -5;
        long b = 15;
  
        try {
            // Using gcd(long a, long b) method
            // of Guava's LongMath class
            // This should throw "IllegalArgumentException"
            // as a < 0
            long ans = LongMath.gcd(a, b);
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}


Output:

java.lang.IllegalArgumentException: a (-5) must be >= 0

Reference: https://google.github.io/guava/releases/20.0/api/docs/com/google/common/math/LongMath.html#gcd-long-long-



Last Updated : 28 Jan, 2019
Like Article
Save Article
Previous
Next
Share your thoughts in the comments
Similar Reads