# QUIZ7

BTN

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using _106_Quiz6;
using _106_Quiz7;
using System.Collections;

namespace _106_Quiz6
{
    public partial class Form1 : Form
    {
        private Shape3D[] shapeArr = new Shape3D[100];
        public Form1()
        {
            InitializeComponent();
        }

        private void btnAddShape_Click(object sender, EventArgs e)
        {
            string shape = cboxShape.SelectedItem.ToString();
            switch (shape)
            {
                case "球":
                    shapeArr[Shape3D.Amount] = new Ball(Double.Parse(txtPara1.Text), Double.Parse(txtDensity.Text));
                    break;
                case "立方體":
                    shapeArr[Shape3D.Amount] = new Cube(Double.Parse(txtPara1.Text), Double.Parse(txtDensity.Text));
                    break;
                case "圓柱體":
                    shapeArr[Shape3D.Amount] = new Cylinder(Double.Parse(txtPara1.Text), Double.Parse(txtPara2.Text),Double.Parse(txtDensity.Text));
                    break;
                case "金字塔":
                    shapeArr[Shape3D.Amount] = new Pyramid(Double.Parse(txtPara1.Text), Double.Parse(txtPara2.Text),Double.Parse(txtDensity.Text));
                    break;
                default:
                    break;
            }
            txtAmountOfShape.Text = Shape3D.Amount.ToString();
            txtBallAmount.Text = Ball.Amount.ToString();
            txtCubeAmount.Text = Cube.Amount.ToString();
            txtCylinderAmount.Text = Cylinder.Amount.ToString();
            txtPyramidAmount.Text = Pyramid.Amount.ToString();
            ShowAllShapeInfo();
        }
        private void ShowAllShapeInfo()
        {
            string info="";
            for (int i=0; i<Shape3D.Amount; i++)
            {
                info += (shapeArr[i].ShapeProperty() + "\r\n");
            }
            txtMessage.Text = info;
        }

        private void cboxShape_SelectedIndexChanged(object sender, EventArgs e)
        {
            string shape = cboxShape.SelectedItem.ToString();
            switch (shape)
            {
                case "球":
                    lblPara1.Text = "半徑";
                    lblPara2.Visible= false;
                    txtPara2.Visible = false;
                    break;
                case "立方體":
                    lblPara1.Text = "邊長";
                    lblPara2.Visible = false;
                    txtPara2.Visible = false;
                    break;
                case "圓柱體":
                    lblPara1.Text = "半徑";
                    lblPara2.Visible = true;
                    lblPara2.Text = "高";
                    txtPara2.Visible = true;
                    break;
                case "金字塔":
                    lblPara1.Text = "邊長";
                    lblPara2.Visible = true;
                    lblPara2.Text = "高";
                    txtPara2.Visible = true;
                    break;
                default:
                    break;

            }

        }

        private void cBoxMaterial_SelectedIndexChanged(object sender, EventArgs e)
        {
            string material = cBoxMaterial.SelectedItem.ToString();
            double density;
            bool canModified = false;
            switch (material)
            {
                case "鋁":
                    density = 2.7; 
                    break;
                case "鐵":
                    density = 7.87;
                    break;
                case "鉛":
                    density = 11.3;
                    break;
               
                default:
                    density = 0;
                    canModified = true;
                    break;
            }
            txtDensity.Text = density.ToString();
            if (!canModified)
                txtDensity.Enabled = false;
        }

        private void btn_FindHeaviestShape_Click(object sender, EventArgs e)
        {
            string info = "";
            double maxWeight = 0;
            int index = 0;
            while (shapeArr[index]!=null)
            {
                if(shapeArr[index].Weight() > maxWeight)
                {
                    maxWeight = shapeArr[index].Weight();
                    info = shapeArr[index].ShapeProperty();
                }
                index++;
            }
            txt_ShowHeaviestShape.Text = info;
        }
    }
}

CY

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using _106_Quiz7;

namespace _106_Quiz6
{
    class Cylinder:Shape3D
    {
        new private static int _amount;  //隱藏繼承
        private double _radius;
        private double _height;
        private static double _pi = 3.1415926;
        public Cylinder():base()
        {
            _radius = 0;
            _height = 0;
            _amount++;
        }
        public Cylinder(double radius, double height,double density):base(density)
        {
            Radius = radius;
            Height = height;
            _amount++;
        }
        new public static int Amount  //隱藏繼承
        {
            get { return _amount; }
        }
        public double Radius
        {
            get { return _radius; }
            set
            {
                if (value < 0)
                    _radius = 0;
                else
                    _radius = value;
            }
        }
        public double Height
        {
            get { return _height; }
            set
            {
                if (value < 0)
                    _height = 0;
                else
                    _height = value;
            }
        }

        public override double Volume()   //改寫父類別的方法, 給其他類別使用故宣告為 public
        {
            return _pi * _radius * _radius * _height;
        }


        public override string ShapeProperty()   //改寫父類別的方法, 給其他類別使用故宣告為 public
        {
            string str = string.Format("{0,8}", "Cylinder");
            str += '\t';
            str += string.Format("{0,8:F2}", _radius);
            str += '\t';
            str += string.Format("{0,8:F2}", _height);
            str += '\t';
            str += Property();      //重構, 降低重複的程式碼
            return str;
        }
    }
}

Shape3D

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _106_Quiz7
{
    class Shape3D
    {
        protected static int _amount;  //被繼承的欄位 (資料成員)需宣告為 protected
        protected double _density;     //被繼承的欄位 (資料成員)需宣告為 protected
        public Shape3D()
        {
            _density = 0;
            _amount++;
        }

        public Shape3D(double density)
        {
            Density = density;
            _amount++;
        }
        public double Density
        {
            get { return _density; }
            set
            {
                if (value < 0)
                    _density = 0;
                else
                    _density = value;
            }
        }
        public static int Amount     //要給其他類別取用, 故宣告為 public
        {
            get { return _amount; }
        }

        public virtual double Volume()  //虛擬函式, 子類別需進行 override
        {
            return 0;
        }
        public double Weight()         //開放給其他類別使用, 故宣告成 public
        {
            return _density * Volume();
        }
        public virtual string ShapeProperty()   //虛擬函式, 子類別需進行 override
        {
            return "";
        }
        protected string Property()      //只讓子類別呼叫, 故宣告 protected, 抽出子類別重複的程式碼進行重構
        {
            string str="";
            str += string.Format("{0,8:F2}", _density);
            str += '\t';
            str += string.Format("{0,8:F2}", Volume());
            str += '\t';
            str += string.Format("{0,8:F2}", Weight());
            return str;
        }

    }
}