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Java Guava | sqrt(int x, RoundingMode mode) method of IntMath Class

  • Last Updated : 21 Jan, 2019

The method sqrt(int x, RoundingMode mode) of Guava’s IntMath class returns the square root of x, rounded with the specified rounding mode.

Syntax:

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public static int sqrt(int x, RoundingMode mode)

Exceptions:

  • 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(int x, RoundingMode mode) method
// of Guava's IntMath class
  
import java.math.RoundingMode;
import com.google.common.math.IntMath;
  
class GFG {
  
    // Driver code
    public static void main(String args[])
    {
        int x1 = 226;
  
        // Using sqrt(int x, RoundingMode mode)
        // method of Guava's IntMath class
        // The RoundingMode HALF_EVEN rounds towards
        // the nearest neighbor unless both neighbors
        // are equidistant, in which case, round towards
        // the even neighbor.
        int ans1 = IntMath.sqrt(x1,
                                RoundingMode.HALF_EVEN);
  
        System.out.println("Square root of x1 is: "
                           + ans1);
  
        int x2 = 154;
  
        // Using sqrt(int x, RoundingMode mode)
        // method of Guava's IntMath class
        // The RoundingMode FLOOR rounds towards
        // negative infinity.
        int ans2 = IntMath.sqrt(x2,
                                RoundingMode.FLOOR);
  
        System.out.println("Square root of x2 is: "
                           + ans2);
    }
}
Output:
Square root of x1 is: 15
Square root of x2 is: 12

Example 2:




// Java code to show implementation of
// sqrt(int x, RoundingMode mode) method
// of Guava's IntMath class
  
import java.math.RoundingMode;
import com.google.common.math.IntMath;
  
class GFG {
  
    // Driver code
    public static void main(String args[])
    {
        int x1 = -65;
        try {
            // Using sqrt(int x, RoundingMode mode)
            // method of Guava's IntMath 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 x1 < 0
            int ans1 = IntMath.sqrt(x1,
                                    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/IntMath.html#sqrt-int-java.math.RoundingMode-




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