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: 

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

Program 2: