### Java Math sqrt() example

In this guide, you will learn about the Math sqrt() method in Java programming and how to use it with an example.

## 1. Math sqrt() Method Overview

### Definition:

The sqrt() method of Java's Math class is used to calculate the square root of a given number.

### Syntax:

``Math.sqrt(double a)``

### Parameters:

- a: The value whose square root needs to be computed.

### Key Points:

- If the argument a is NaN or less than zero, then the result will be NaN.

- If the argument a is positive infinity, then the result will be positive infinity.

- If argument a is zero, then the result will be zero.

- It returns the positive square root of a double value.

## 2. Math sqrt() Method Example

``````public class SqrtExample {
public static void main(String[] args) {
System.out.println("Square root of 16: " + Math.sqrt(16));
System.out.println("Square root of 0: " + Math.sqrt(0));
System.out.println("Square root of 7: " + Math.sqrt(7));
System.out.println("Square root of 2.25: " + Math.sqrt(2.25));
System.out.println("Square root of -9 (will result in NaN): " + Math.sqrt(-9));
}
}
``````

### Output:

```Square root of 16: 4.0
Square root of 0: 0.0
Square root of 7: 2.6457513110645907
Square root of 2.25: 1.5
Square root of -9 (will result in NaN): NaN
```

### Explanation:

In the example:

1. The square root of 16 is 4.

2. The square root of 0 is 0.

3. The square root of 7 is approximately 2.6457513110645907.

4. The square root of 2.25 is 1.5.

5. Since we can't compute the square root of a negative number using this method, it results in NaN (Not a Number).