# Calculate Area Circle Using Java Example

All programming language is designed to perform a mathematical operation. Java language is bundled with Math library for calculation in a simple and complex problem.

This tutorial will teach you on how your Java program **Calculate the Area of a Circle** based on user input value. This tutorial will use a **Scanner function** and an **Integer** and **Double** data type for **variables**. Please follow all the steps to complete this tutorial.

### Calculate the Area of a Circle in Java Steps

- Create a new class and name it what you want.

2. Above your Main Class, Insert an import code to access the Scanner library.

[java]import java.util.Scanner;[/java]3. Declare a scanner and two variables inside your main method.

[java]Scanner input = new Scanner(System.in);int radius;

double area;[/java]

4. After step 3, insert the code below for user input.

[java]System.out.print(“Enter value of the circle radius: “);radius = input.nextInt();[/java]

5. After step 4, insert the code below for the algorithm and output.

[java]area = Math.PI * radius * radius;System.out.println(“Area of a circle is: ” + area);[/java]

6. Run your program and the output should look like the image below.

7. Complete Source Code.

[java]import java.util.Scanner;public class CalculateCircleArea {

public static void main(String args[]){

Scanner input = new Scanner(System.in);

int radius;

double area;

System.out.print(“Enter value of the circle radius: “);

radius = input.nextInt();

area = Math.PI * radius * radius;

System.out.println(“Area of a circle is: ” + area);

}

}[/java]

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