# Java Program - Square Root of a Number

If a number is multiplied by itself ($n*n$), the final number will be the square of that number and finding the square root of a number is inverse operation of squaring the number. If x is the square root of y, it can be expressed as below:

$x = \sqrt{y}$

Alternatively, it can also be expressed as:

$x^2 = y$

### Example: Using sqrt() method of Java Math Class

The sqrt() method of Java Math class can be used to return square root of a number.

import java.lang.Math;

public class MyClass {
public static void main(String[] args) {
double x = 16;
double y = 25;

//sqrt() takes double datatype as argument
double x1 = Math.sqrt(x);
double y1 = Math.sqrt(y);
System.out.println("Square root of " + x + " is " + x1);
System.out.println("Square root of " + y + " is " + y1);
}
}


Output

Square root of 16.0 is 4.0
Square root of 25.0 is 5.0


### Example: Using pow() method of Java Math Class

The pow() method of Java Math class can also be used to calculate square root of a number.

import java.lang.Math;

public class MyClass {
public static void main(String[] args) {
double x = 16;
double y = 25;

//pow() takes double datatype as argument
double x1 = Math.pow(x, 0.5);
double y1 = Math.pow(y, 0.5);
System.out.println("Square root of " + x + " is " + x1);
System.out.println("Square root of " + y + " is " + y1);
}
}


Output

Square root of 16.0 is 4.0
Square root of 25.0 is 5.0