Java Math.sqrt() method

The java.lang.Math.sqrt() is used to return the square root of a number.

Syntax

Parameter

Return

If the argument is positive double value, this method will return the square root of a given value.
If the argument is NaN or less than zero, this method will return NaN.
If the argument is positive infinity, this method will return positive Infinity.
If the argument is positive or negative Zero, this method will return the result as Zero with same sign.

Example 1

public class SqrtExample1
{
    public static void main(String[] args) 
    {
        double x = 81.0;
        // Input positive value, Output square root of x
        System.out.println(Math.sqrt(x));
    }
}

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Output:

9.0

Example 2

public class SqrtExample2
{
    public static void main(String[] args) 
    {
        double x = -81.78;
        // Input negative value, Output NaN
        System.out.println(Math.sqrt(x));
    }
}

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Output:

NaN

Example 3

public class SqrtExample3
{
    public static void main(String[] args) 
    {
        double x = 0.0/0;
        // Input NaN, Output NaN  
        System.out.println(Math.sqrt(x));
    }
}

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Output:

NaN

Example 4

public class SqrtExample4
{
    public static void main(String[] args) 
    {
        double x = 1.0/0;
        // Input positive infinity, Output positive infinity  
        System.out.println(Math.sqrt(x));
    }
}

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Output:

Infinity

Example 5

public class SqrtExample5
{
    public static void main(String[] args) 
    {
        double x = 0.0;
        // Input positive Zero, Output positive zero 
        System.out.println(Math.cbrt(x));
    }
}

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Output: