2021-10-27 小学生长方形、圆形、三角形面积计算

import java.util.Scanner;

public class LianXi {

    public static void main(String[] args) {
Scanner sc=new Scanner(System.in);
        for (;;){
            System.out.println("请选择形状的类型："+"\n"+"1.长方形"+"\n"+"2.圆形"+"\n"+"3.三角形"+"\n"+"请输入选项：");
            int xz1=sc.nextInt();//获取输入的图形，得的到该图形的计算公式
            switch (xz1){
                case 1:
                    System.out.println("请输入长方形的基本信息："+"\n"+"长为：");
                    double cfb= sc.nextDouble();
                    System.out.println("宽为：");
                    double cfg= sc.nextDouble();
                    double cfm=cfb*cfg;
                    System.out.println("面积为："+cfm);
                    break;
                case 2:
                    System.out.println("请输入圆形的基本信息："+"\n"+"半径为：");
                    double yxb= sc.nextDouble();
                    final double PA=3.14;
                    double yxm=yxb*yxb*PA;
                    System.out.println("面积为："+yxm);
                    break;
                case 3:
                    System.out.println("请输入三角形的基本信息："+"\n"+"底边为：");
                    double sjxd= sc.nextDouble();
                    System.out.println("请输入高：");
                    double sjxg= sc.nextDouble();
                    double sjxm=1.0/2*sjxd*sjxg;
                    System.out.println("面积为："+sjxm);
                    break;
                default:
                    System.out.println("输入错误");
}
}