Java Guava | mod(long x, long m) of LongMath Class with Examples

Last Updated : 28 Jan, 2019

The mod(long x, long m) method of Guava’s LongMath Class accepts two parameters x and m, and used to calculate the value of x modulus under m.

Syntax:

public static long mod(long x, long m)

Parameters: This method accepts two parameters x and m which are of long type to calculate x modulo m.

Return Value: The method returns x mod m that will be a non-negative value less than m.

Exception: The method mod(long x, long m) throws ArithmeticException if m <= 0.

Below examples illustrate the mod(long x, long m) method:

Example 1 :

// Java code to show implementation of 
// mod(long x, long m) 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 x1 = -77; 
        long m1 = 4; 
  
        long ans1 = LongMath.mod(x1, m1); 
  
        // Using mod(long x, long m) 
        // method of Guava's LongMath class 
        System.out.println(x1 + " mod "
                           + m1 + " is : " + ans1); 
  
        long x2 = 22; 
        long m2 = 6; 
  
        long ans2 = LongMath.mod(x2, m2); 
  
        // Using mod(long x, long m) 
        // method of Guava's LongMath class 
        System.out.println(x2 + " mod "
                           + m2 + " is : " + ans2); 
    } 
} 

Output:

-77 mod 4 is : 3
22 mod 6 is : 4

Example 2:

// Java code to show implementation of 
// mod(long x, long m) method of Guava's 
// LongMath class 
import java.math.RoundingMode; 
import com.google.common.math.LongMath; 
  
class GFG { 
  
    static long findMod(long x, long m) 
    { 
        try { 
            // Using mod(long x, long m) 
            // method of Guava's LongMath class 
            // This should throw "ArithmeticException" 
            // as m <= 0 
            long ans = LongMath.mod(x, m); 
  
            // Return the answer 
            return ans; 
        } 
        catch (Exception e) { 
            System.out.println(e); 
            return -1; 
        } 
    } 
  
    // Driver code 
    public static void main(String args[]) 
    { 
        long x = 11; 
        long m = -5; 
  
        try { 
            // Function calling 
            findMod(x, m); 
        } 
        catch (Exception e) { 
            System.out.println(e); 
        } 
    } 
} 

Output:

java.lang.ArithmeticException: Modulus must be positive

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

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