StrictMath sqrt() Method in Java

The java.lang.StrictMath.sqrt() is an inbuilt method of StrictMath class in Java which is used to obtain the exact rounded positive square root of a specified double value. Syntax:

public static double sqrt(double num)

Parameters: The function accepts a single parameter num of double type, whose square root is to be returned by the function. Return Values: This method returns the positive square root of num. it also gives rise to doubt special cases:

• The function returns NaN if the argument is NaN or less than zero
• The function returns positive infinity when the argument is positive infinite.
• The function returns zero with the same sign as the argument if the argument is zero
• The result is the double value nearest to the mathematical square root of the argument value.

Examples:

Input: num = 25
Output: 5.0

Input: -729
Output: NaN

Below programs illustrate the use of java.lang.StrictMath.sqrt() method: Program 1:

Java

// Java Program to illustrate
// java.lang.StrictMath.sqrt() function
import java.lang.*;

public class Geeks {

    public static void main(String[] args)
    {

        double num1 = 289, num2 = -729;
        double num3 = 0.0, num4 = 547.87;

        // It returns the positive square root
        double sqrt_Value = StrictMath.sqrt(num1);
        System.out.println("square root = " + sqrt_Value);

        sqrt_Value = StrictMath.sqrt(num2);
        System.out.println("square root = " + sqrt_Value);

        sqrt_Value = StrictMath.sqrt(num3);
        System.out.println("square root = " + sqrt_Value);

        sqrt_Value = StrictMath.sqrt(num4);
        System.out.println("square root = " + sqrt_Value);
    }
}

Output:

square root = 17.0
square root = NaN
square root = 0.0
square root = 23.406622994357814

Program 2:

Java

// Java Program to illustrate
// java.lang.StrictMath.sqrt() function
import java.lang.*;

public class Geeks {

    public static void main(String[] args)
    {

        double num1 = 1160, num2 = -97;
        double num3 = -0.0, num4 = 144;
        double num5 = -72.18;

        // It returns the positive square root
        double sqrt_Value = StrictMath.sqrt(num1);
        System.out.println("square root = " + sqrt_Value);

        sqrt_Value = StrictMath.sqrt(num2);
        System.out.println("square root = " + sqrt_Value);

        sqrt_Value = StrictMath.sqrt(num3);
        System.out.println("square root = " + sqrt_Value);

        sqrt_Value = StrictMath.sqrt(num4);
        System.out.println("square root = " + sqrt_Value);

        sqrt_Value = StrictMath.sqrt(num5);
        System.out.println("square root = " + sqrt_Value);
    }
}

Output:

square root = 34.058772731852805
square root = NaN
square root = -0.0
square root = 12.0
square root = NaN