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Main.java
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Main.java
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package beginner.ex1002;
import java.util.Scanner;
public class Main
{
public static void main(String[] args)
{
TextInterface textInterface = new TextInterface();
textInterface.print();
}
}
class TextInterface
{
private Scanner input;
private Circle circle;
public TextInterface()
{
input = new Scanner(System.in);
circle = new Circle(input.nextDouble());
}
public void print()
{
System.out.printf("A=%.4f%n", circle.areaCalculation());
}
}
class Circle
{
public static final double PI = 3.14159;
private double ray, area;
public Circle(double ray)
{
this.ray = ray;
}
public double areaCalculation()
{
area = PI * Math.pow(ray, 2);
return area;
}
}