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Java Guava | sqrt(long x, RoundingMode mode) of LongMath Class with Examples
  • Last Updated : 28 Jan, 2019

The method sqrt(long x, RoundingMode mode) of Guava’s LongMath Class accepts two parameters and calculates the square root of the first parameter rounded according to the rounding mode specified by the second parameter.

Syntax:

public static long sqrt(long x, RoundingMode mode)

Parameters: This method takes two parameters:

  • x: is a long value of whose square root is to be found.
  • mode: is the rounding mode according to which the rounding is to be done.

Return Value: This method returns square root of x, rounded according to the specified rounding mode.

Exceptions: This method throws following parameters:



  • IllegalArgumentException: if x < 0.
  • ArithmeticException: if mode is RoundingMode.UNNECESSARY and sqrt(x) is not an integer.

Enum RoundingMode

Enum ConstantDescription
CEILINGRounding mode to round towards positive infinity.
DOWNRounding mode to round towards zero.
FLOORRounding mode to round towards negative infinity.
HALF_DOWNRounding mode to round towards “nearest neighbor” unless both neighbors are equidistant, in which case round down.
HALF_EVENRounding mode to round towards the “nearest neighbor” unless both neighbors are equidistant, in which case, round towards the even neighbor.
HALF_UPRounding mode to round towards “nearest neighbor” unless both neighbors are equidistant, in which case round up.
UNNECESSARYRounding mode to assert that the requested operation has an exact result, hence no rounding is necessary.
UPRounding mode to round away from zero.

Below given are some examples to understand the implementation in a better way:

Example 1:




// Java code to show implementation of
// sqrt(long x, 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 x1 = 524;
  
        // Using sqrt(long x, RoundingMode mode)
        // method of Guava's LongMath class
        // The RoundingMode HALF_EVEN rounds towards
        // the nearest neighbor unless both neighbors
        // are equidistant, in which case, round towards
        // the even neighbor.
        long ans1
            = LongMath.sqrt(x1,
                            RoundingMode.HALF_EVEN);
  
        System.out.println("Square root of " + x1
                           + " is : " + ans1);
  
        long x2 = 316;
  
        // Using sqrt(long x, RoundingMode mode)
        // method of Guava's LongMath class
        // The RoundingMode FLOOR rounds towards
        // negative infinity.
        long ans2
            = LongMath.sqrt(x2,
                            RoundingMode.FLOOR);
  
        System.out.println("Square root of " + x2
                           + " is : " + ans2);
    }
}
Output:
Square root of 524 is : 23
Square root of 316 is : 17

Example 2:




// Java code to show implementation of
// sqrt(long x, 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[])
    {
        int x = -65;
  
        try {
            // Using sqrt(long x, RoundingMode mode)
            // method of Guava's LongMath class
            // The RoundingMode HALF_EVEN rounds towards
            // the nearest neighbor unless both neighbors
            // are equidistant, in which case, round towards
            // the even neighbor.
  
            // This should throw "IllegalArgumentException"
            // as x < 0
            long ans1 = LongMath.sqrt(x,
                                      RoundingMode.HALF_EVEN);
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}
Output:
java.lang.IllegalArgumentException: x (-65) must be >= 0

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

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