期中考參考答案 - 第二&三題

第二題專案檔
第三題專案檔
==========第二題==========
Complex.cs

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

namespace Mid103_2
{
    class Complex
    {
        private double real;
        private double imag;
        //建構子
        public Complex(double real, double imag)
        {
            this.real = real;
            this.imag = imag;
        }
        //Property
        public double Real
        {
            get { return real; }
            set { real = value; }
        }
        public double Imag
        {
            get { return imag; }
            set { imag = value; }
        }
        //物件方法
        public double Magnitude()
        {
            return Math.Sqrt(real*real+imag*imag);
        } //計算複數的絕對值大小
        //類別方法
        public static Complex Reciprocal(Complex num)
        {
            Complex result = new Complex(0, 0);
            if (num.Magnitude() == 0)
                return null;
            result.Real = 1 / (num.real*num.real+num.imag*num.imag) * num.Real;
            result.Imag = -1 / (num.real*num.real+num.imag*num.imag) * num.Imag;
            return result;
        } //倒數
        public static Complex Multiply(Complex num1,Complex num2)
        {
            Complex result = new Complex(0, 0);
            result.Real = num1.Real*num2.Real-num1.Imag*num2.Imag;
            result.Imag = num1.Real*num2.Imag+num1.Imag*num2.Real;
            return result;
        } //複數相乘
        public static Complex Power(Complex num,int exp)
        {
            Complex result = new Complex(1, 0);
            if (exp == 0)
                return result;

            for (int i = 0; i < exp; i++)
            {
                result = Multiply(result, num);
            }
            return result;
        } //複數的次方
        //改寫
        public override string ToString()
        {   
            if (Imag==0)
                return string.Format("{0:0.####}", Real);
            else if (Real==0)
                return string.Format("{0:0.####}i", Imag);
            else
                return string.Format("{0:0.####}{1}{2:0.####}i",Real,(Imag > 0 ? '+' : '-'),Math.Abs(Imag));
        }  //列印複數
        
    }
}

Program.cs

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

namespace Mid103_2
{
    class Program
    {
        static void Main(string[] args)
        {
            Complex num1, num2;
            double real, imag;
            Console.WriteLine("請輸入複數的實部");
            real=double.Parse(Console.ReadLine());
            Console.WriteLine("請輸入複數的虛部");
            imag = double.Parse(Console.ReadLine());
            num1 = new Complex(real, imag);
            Console.WriteLine("{0} 的絕對值 = {1:0.####}",num1.ToString(),num1.Magnitude());
            num2 = Complex.Reciprocal(num1);
            Console.WriteLine("{0} 的倒數 = {1}", num1.ToString(), num2.ToString());
            for (int i=0;i<=5;i++)
                Console.WriteLine("({0})^{1}={2}",num1.ToString(),i,Complex.Power(num1,i).ToString());
            Console.ReadLine();
        }
    }
}

==========第三題==========
form1.cs

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;

namespace Mid103_3
{
    public partial class Form1 : Form
    {
        private Drink[] drinkArr = new Drink[10];

        public Form1()
        {
            InitializeComponent();
            cbox_DrinkSelect.SelectedIndex = 0;
            cbox_SortType.SelectedIndex = 0;
        }

        private void btn_Confirm_Click(object sender, EventArgs e)
        {
            int amount = Drink.Amount;
            if (amount > 10)
                MessageBox.Show("點餐數目超過上限");
            double volume=double.Parse(txt_DrinkVolume.Text);

            switch (cbox_DrinkSelect.SelectedIndex)
            {
                case 0:
                    Water water=new Water(int.Parse(txt_WaterPricePerTime.Text),volume,double.Parse(txt_WaterDiscount.Text));
                    drinkArr[amount] = water;
                    break;
                case 1:
                    SodaWater swater=new SodaWater(volume,double.Parse(txt_SodaWaterDiscount.Text));
                    drinkArr[amount] = swater;
                    break;
                case 2:
                    Juice juice=new Juice(double.Parse(txt_JuicePricePerUnit.Text), volume,double.Parse(txt_JuiceDiscount.Text));
                    drinkArr[amount] = juice;
                    break;
            }
            txt_AmountOfDrink.Text = Drink.Amount.ToString();
        }

        private void SortByDrinkType()
        {
            for (int i = 0; i < Drink.Amount; i++)
            {
                for (int j = 0; j < Drink.Amount - 1; j++)
                {
                    if (drinkArr[j].DrinkType > drinkArr[j + 1].DrinkType)
                    {
                        Drink temp=null;
                        temp = drinkArr[j];
                        drinkArr[j] = drinkArr[j+1];
                        drinkArr[j+1]=temp;
                    }
                }
            }
        }
        private void SortByPrice()
        {
            for (int i = 0; i < Drink.Amount; i++)
            {
                for (int j = 0; j < Drink.Amount - 1; j++)
                {
                    if (drinkArr[j].Price() > drinkArr[j + 1].Price())
                    {
                        Drink temp = null;
                        temp = drinkArr[j];
                        drinkArr[j] = drinkArr[j + 1];
                        drinkArr[j + 1] = temp;
                    }
                }
            }
        }
        private void btn_CheckOut_Click(object sender, EventArgs e)
        {
            txt_Message.Text = "";
            txt_Message.Update();
            switch (cbox_SortType.SelectedIndex)
            {
                case 0:
                    SortByDrinkType();
                    break;
                case 1:
                    SortByPrice();
                    break;
            }
            int total = 0;
            for (int i = 0; i < Drink.Amount; i++)
            {
                txt_Message.AppendText(drinkArr[i].Show() + Environment.NewLine);
                total += drinkArr[i].Price();
            }
            txt_Message.AppendText("總共      "+total.ToString()+ "元" +'\n');
        }

    }
}

Drink.cs

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

namespace Mid103_3
{
    class Drink
    {
        private double volume;
        private double discountRate;
        private static int amount;
        protected int drinkType;
        public Drink(double volume, double discountRate)
        {
            this.Volume = volume;
            this.DiscountRate = discountRate;
            amount++;
        }
 
        public double Volume
        {
            get { return volume; }
            set
            {
                if (value < 0)
                    volume = 0;
                else
                    volume = value;
            }
        }
        public int DrinkType
        {
            get{return drinkType;}
        }
        public static int Amount
        {
            get { return amount; }
        }
        public double DiscountRate
        {
            get { return discountRate; }
            set
            {
                if (value < 0)
                    discountRate = 0;
                else if (value > 1)
                    discountRate = 1;
                else
                    discountRate = value;
            }
        }
        public int Price()
        {
            return (int)(DiscountRate * OriginalPrice());
        }
        protected virtual int OriginalPrice()
        {
            return 0;
        }
        public string Show()
        {
            return ShowProperty() + '\t'+Price().ToString();
           
        }
        protected virtual string ShowProperty()
        {
            return "";
        }
    }
}

Water.cs

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

namespace Mid103_3
{
    class Water:Drink
    {
        private int pricePerOnce;
        public Water(int pricePerOnce, double volume, double discount)
            : base(volume, discount)
        {
            this.PricePerOnce = pricePerOnce;
            drinkType = 0;
        }
        public int PricePerOnce
        {
            get { return pricePerOnce; }
            set
            {
                if (pricePerOnce < 0)
                    pricePerOnce = 0;
                else
                    pricePerOnce = value;
            }
        }
        protected override int OriginalPrice()
        {
            return PricePerOnce;
        }
        protected override string ShowProperty()
        {
            return string.Format("水\t{0}cc\t{1}", Volume,DiscountRate); 
        }
    }
}

SodaWater.cs

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

namespace Mid103_3
{
    class SodaWater:Drink
    {
        private static int[] price={50,100,150};
        public SodaWater(double volume, double discount)
            : base(volume, discount)
        {
            drinkType = 1;
        }
        protected override int OriginalPrice()
        {
            if (Volume < 500)
                return price[0];
            else if (Volume < 1000)
                return price[1];
            else
                return price[2];
           
        }
        protected override string ShowProperty()
        {
            return string.Format("汽水\t{0}cc\t{1}", Volume, DiscountRate);
        }
    }
}

Juice.cs

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

namespace Mid103_3
{
    class Juice:Drink
    {
        private double pricePerUnit;
        public Juice(double pricePerUnit, double volume, double discount)
            : base(volume, discount)
        {
            this.PricePerUnit = pricePerUnit;
            drinkType = 2;
        }
        public double PricePerUnit
        {
            get { return pricePerUnit; }
            set
            {
                if (pricePerUnit < 0)
                    pricePerUnit = 0;
                else
                    pricePerUnit = value;
            }
        }
        protected override int OriginalPrice()
        {
            return (int)(pricePerUnit * Volume);
        }
        protected override string ShowProperty()
        {
            return string.Format("果汁\t{0}cc\t{1}", Volume, DiscountRate);
        }
    }
}