Java Math sqrt() Usage and Example

Java Math Mathematical Methods

The Java Math sqrt() method returns the square root of the specified number.

The syntax of the sqrt() method is:

Math.sqrt(double num)

Note: sqrt() is a static method. Therefore, we can access this method using the class name.

sqrt() Parameter

• num -The number to calculate the square root of

sqrt() Return Value

• Returns the square root of the specified number

• Returns NaN if the parameter is less than 0 or NaN

Note: This method always returns a positive number and rounds correctly.

Example: Java Math sqrt()

class Main {
　　public static void main(String[] args) {
　　　　//Create a double variable
　　　　double value1　= Double.POSITIVE_INFINITY;
　　　　double value2　=　25.0;
　　　　double value3　=　-16;
　　　　double value4　= 0.0;
　　　　//Square root of infinity
　　　　System.out.println(Math.sqrt(value1));　　//　Infinity
　　　　//Square root of a positive number
　　　　System.out.println(Math.sqrt(value2));　　//　5.0
　　　　//Square root of a negative number
　　　　System.out.println(Math.sqrt(value3));　　//　NaN
　　　　//Square root of zero
　　　　System.out.println(Math.sqrt(value4));　　//　0.0
　　}
}

In the above example, we used the Math.sqrt() method to calculate the square root of infinity, positive numbers, negative numbers, and zero.

Here, Double.POSITIVE_INFINITY is used to implement positive infinity in the program.

When we pass an int value to the sqrt() method, it automatically converts the int value to a double value.

int a =　36;
Math.sqrt(a);　　　//　Return　6.0

Recommended Tutorials

• Java Math.pow()

• Java Math.cbrt()

Java Math Mathematical Methods