circle.java

1+2+3...累加到最接近2009的数

package javaobj_task1;

import java.util.Scanner; 

public class Circle{ 
	public static void CircleArea(String args[]){ 
		double r; 
		double S; 
		Scanner input=new Scanner(System.in);
		System.out.println("请输入半径："); 
		r=input.nextDouble();
		S=Area(r); 
		System.out.println("该圆面积为： "+S); 
		}
	public static double Area(double r) { 
		double area=3.14159265358 * r * r; 
		return area; 
		} 
	}