The java.math.BigDecimal.sqrt(MathContext mc) is an inbuilt function added in Java SE 9 & JDK 9 which returns BigDecimal value of square root of a BigDecimal on which sqrt() method is applied with rounding according to the context settings.
Syntax:
public BigDecimal sqrt(MathContext mc)
Parameters: This method accepts a parameter mc of type MathContext for context settings.
Return Value: This method returns an approximation to the square root of this with rounding according to the context settings.
Exception: The method throws ArithmeticException for following conditions.
- If BigDecimal number is less than zero.
- If an exact result is requested (Precision = 0) and there is no finite decimal expansion of the exact result.
- If the exact result cannot fit in Precision digits.
Note: This method is only available from JDK 9.
Below programs are used to illustrate the sqrt() method of BigDecimal:
Example 1:
// Java program to demonstrate sqrt() method  import java.math.*;  public class GFG {      public static void main(String[] args)    {          // Creating a BigDecimal object        BigDecimal a, squareRoot;          a = new BigDecimal("100000000000000000000");          // Set precision to 10        MathContext mc            = new MathContext(10);          // calculate square root of bigDecimal        // using sqrt() method        squareRoot = a.sqrt(mc);          // print result        System.out.println("Square root value of " + a                           + " is " + squareRoot);    }} |
Square root value of 100000000000000000000 is 1.000000000E+10
Example 2: Showing Exception thrown by sqrt() method.
// Java program to demonstrate sqrt() method  import java.math.*;  class GFG {      public static void main(String[] args)    {          // Creating a BigDecimal object        BigDecimal a, squareRoot;          a = new BigDecimal("-4");          // Set precision to 10        MathContext mc            = new MathContext(10);          // calculate square root of bigDecimal        // using sqrt() method        try {            squareRoot = a.sqrt(mc);              // print result            System.out.println("Square root"                               + " value of " + a                               + " is " + squareRoot);        }        catch (Exception e) {            System.out.println(e);        }    }} |
java.lang.ArithmeticException: Attempted square root of negative BigDecimal
References: https://docs.oracle.com/javase/9/docs/api/java/math/BigDecimal.html#sqrt-java.math.MathContext-
