BigDecimal sqrt() Method in Java with Examples

Last Updated : 29 May, 2019

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); 
    } 
} 

Output:

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); 
        } 
    } 
} 

Output:

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-

Java Program For Arithmetic Operations Between BigDecimal and Primitive Data Types

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BigDecimal sqrt() Method in Java with Examples

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