package 作业;

import java.util.Scanner;

public class Demo5 {

	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
		final double PI = 3.14;
		System.out.print("请输入半径：");
		double R = input.nextDouble();
		double c = 2 * PI * R;
		double s = PI * R * R;
		System.out.println("该圆的半径为：" + "R=" + R);
		System.out.println("该圆的周长为：" + "c=2*PI*" + R + "=" + c);
		System.out.println("该圆的面积为：" + "s=PI*" + R + "*" + R + "=" + s);

	}

}