泳池圆的周长和圆环面积

来源：互联网发布：数据备份的策略编辑：程序博客网时间：2024/04/30 18:36

半径为r，圆环半径为3m，已知最外边砌8元/米的围墙，圆环做过道10元/平方米，求造价。

package day141020;/** * 圆类 * @author XWJ * */public class Circle {private double radius;// 半径/** * 构造器 * @param radius 圆的半径 */public Circle(double radius) {this.radius = radius;}/** * 计算面积 * @return */public double getArea() {return Math.PI * radius * radius;}/** * 计算周长 * @return */public double getCircumference() {return 2 * Math.PI * radius;}}

package day141020;import java.util.Scanner;public class CircleRun {private static final double FP = 8.5;private static final double CP = 12;public static void main(String[] args) {Scanner sc = new Scanner(System.in);System.out.print("请输入游泳池的半径: ");if(sc.hasNextDouble()) {double r = sc.nextDouble();Circle small = new Circle(r);Circle big = new Circle(r + 3);System.out.printf("围墙的造价为: ￥%.1f元\n", FP * big.getCircumference());System.out.printf("过道的造价为: ￥%.1f元\n", CP * (big.getArea() - small.getArea()));}else {System.out.println("输入错误!!!");}sc.close();}}

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