Java Guava | LongMath.divide(long, long, RoundingMode) method with Examples

The divide(long p, long q, RoundingMode mode) method of Guava’s LongMath Class accepts three parameters and calculates the result of dividing first parameter by second parameter, rounded according to the rounding mode specified by the third parameter.

Syntax:

public static long divide(long p,
                          long q,
                          RoundingMode mode)

Parameters: The method takes 3 parameters, where p and q are longs and mode is a specified rounding mode.



Return Value: This method returns division of first parameter by second parameter, rounded according to the rounding mode specified by the third parameter.

Exceptions: The method throws ArithmeticException if:

  • q == 0, or
  • mode == UNNECESSARY and p is not an integer multiple of q.

Enum RoundingMode

Enum Constant Description
CEILING Rounding mode to round towards positive infinity.
DOWN Rounding mode to round towards zero.
FLOOR Rounding mode to round towards negative infinity.
HALF_DOWN Rounding mode to round towards “nearest neighbor” unless both neighbors are equidistant, in which case round down.
HALF_EVEN Rounding mode to round towards the “nearest neighbor” unless both neighbors are equidistant, in which case, round towards the even neighbor.
HALF_UP Rounding mode to round towards “nearest neighbor” unless both neighbors are equidistant, in which case round up.
UNNECESSARY Rounding mode to assert that the requested operation has an exact result, hence no rounding is necessary.
UP Rounding mode to round away from zero.

Below examples illustrate the implementation of above method:

Example 1 :

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// Java code to show implementation of
// divide(long p, long q, RoundingMode mode)
// 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 dividend1 = 55;
        long divisor1 = 10;
  
        // Using divide(long p, long q,
        // RoundingMode mode)
        // method of Guava's LongMath class
        long quotient1
            = LongMath.divide(dividend1, divisor1,
                              RoundingMode.HALF_DOWN);
  
        System.out.println(quotient1);
  
        long dividend2 = 55;
        long divisor2 = 10;
  
        // Using divide(long p, long q,
        // RoundingMode mode)
        // method of Guava's LongMath class
        long quotient2
            = LongMath.divide(dividend2, divisor2,
                              RoundingMode.CEILING);
  
        System.out.println(quotient2);
    }
}

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Output:

5
6

Example 2 :

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// Java code to show implementation of
// divide(long p, long q, RoundingMode mode)
// method of Guava's LongMath class
  
import java.math.RoundingMode;
import com.google.common.math.LongMath;
  
class GFG {
  
    static long findDiv(long dividend,
                        long divisor,
                        RoundingMode mode)
    {
        try {
            // Using divide(long p, long q,
            // RoundingMode mode)
            // method of Guava's LongMath class
            long quotient
                = LongMath.divide(dividend,
                                  divisor,
                                  RoundingMode.HALF_DOWN);
  
            // Return the answer
            return quotient;
        }
        catch (Exception e) {
            System.out.println(e);
            return -1;
        }
    }
  
    // Driver code
    public static void main(String args[])
    {
        long dividend = 32;
        long divisor = 0;
  
        try {
  
            // Function calling
            findDiv(dividend, divisor,
                    RoundingMode.HALF_EVEN);
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

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Output:

java.lang.ArithmeticException: / by zero

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



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