.sqrt()

The Math.sqrt() method returns the positive, properly rounded square root of a double-type value.

Syntax

Math.sqrt(double num)

The return type of the .sqrt() method is a double. The data type of the num parameter is also a double. However, if a decimal is not provided, num will still be treated like a double-type.

Some edge cases for the .sqrt() method include the following:

• If num is less than zero or it is not a numeric type (NaN), then NaN is returned.
• If num is positive infinity (Double.POSITIVE_INFINITY), then Infinity is returned.

Example

The following example showcases the .sqrt() method being applied to two variables:

public class Check {
  public static void main(String args[]) {
       double x = 64.0;
       System.out.println(Math.sqrt(x));
       double y = 49.0;
       System.out.println(Math.sqrt(y));
   }
}

This results in the following output:

8.0
7.0