99/11/12期中考完成!!!!!!!!!!!

產生亂數(案件自己拉)
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        int i, bno;
        int[] arry = new int[9];
        public Form1()
        {
            InitializeComponent();
        }

        private void button8_Click(object sender, EventArgs e)
        {
            if (button4.Text == "0")
            {
                String temp;
                temp = button4.Text;
                button4.Text = button8.Text;
                button8.Text = temp;
            }
            else if (button9.Text == "0")
            {
                String temp;
                temp = button9.Text;
                button9.Text = button8.Text;
                button8.Text = temp;
            }
            else
                MessageBox.Show("不能換");
        }
        private void button5_Click_1(object sender, EventArgs e)
        {
            int rdno;
            int temp;
            arry[0] = 0;
            arry[1] = 1;
            arry[2] = 2;
            arry[3] = 3;
            arry[4] = 4;
            arry[5] = 5;
            arry[6] = 6;
            arry[7] = 7;
            arry[8] = 8;
            for (int i = 0; i < 9; i++)
            {
                Random rd = new Random();
                rdno = rd.Next(0, 9);
                button5.Text = Convert.ToString(rdno);
                temp = arry[rdno];
                arry[rdno] = arry[arry.Length - (i + 1)];
                arry[arry.Length - (i + 1)] = temp;
            }

            //output
            button1.Text = Convert.ToString(arry[0]);
            button2.Text = Convert.ToString(arry[1]);
            button3.Text = Convert.ToString(arry[2]);
            button4.Text = Convert.ToString(arry[3]);
            button6.Text = Convert.ToString(arry[4]);
            button7.Text = Convert.ToString(arry[5]);
            button8.Text = Convert.ToString(arry[6]);
            button9.Text = Convert.ToString(arry[7]);
            button10.Text = Convert.ToString(arry[8]);
        }
        private void button1_Click(object sender, EventArgs e)
        {
            if (button2.Text == "0")
            {
                String temp;
                temp = button2.Text;
                button2.Text = button1.Text;
                button1.Text = temp;
            }
            else if (button4.Text == "0")
            {
                String temp;
                temp = button4.Text;
                button4.Text = button1.Text;
                button1.Text = temp;
            }
            else
                MessageBox.Show("不能換");
        }
        private void button2_Click(object sender, EventArgs e)
        {
            if (button1.Text == "0")
            {
                String temp;
                temp = button1.Text;
                button1.Text = button2.Text;
                button2.Text = temp;
            }
            else if (button3.Text == "0")
            {
                String temp;
                temp = button3.Text;
                button3.Text = button2.Text;
                button2.Text = temp;
            }
            else if (button6.Text == "0")
            {
                String temp;
                temp = button6.Text;
                button6.Text = button2.Text;
                button2.Text = temp;
            }
            else
                MessageBox.Show("不能換");
        }
        private void button3_Click(object sender, EventArgs e)
        {
            if (button2.Text == "0")
            {
                String temp;
                temp = button2.Text;
                button2.Text = button3.Text;
                button3.Text = temp;
            }
            else if (button7.Text == "0")
            {
                String temp;
                temp = button7.Text;
                button7.Text = button3.Text;
                button3.Text = temp;
            }
            else
                MessageBox.Show("不能換");
        }
        private void button4_Click(object sender, EventArgs e)
        {
            if (button1.Text == "0")
            {
                String temp;
                temp = button1.Text;
                button1.Text = button4.Text;
                button4.Text = temp;
            }
            else if (button6.Text == "0")
            {
                String temp;
                temp = button6.Text;
                button6.Text = button4.Text;
                button4.Text = temp;
            }
            else if (button8.Text == "0")
            {
                String temp;
                temp = button8.Text;
                button8.Text = button4.Text;
                button4.Text = temp;
            }
            else
                MessageBox.Show("不能換");
        }
        private void button6_Click(object sender, EventArgs e)
        {
            if (button2.Text == "0")
            {
                String temp;
                temp = button2.Text;
                button2.Text = button6.Text;
                button6.Text = temp;
            }
            else if (button4.Text == "0")
            {
                String temp;
                temp = button4.Text;
                button4.Text = button6.Text;
                button6.Text = temp;
            }
            else if (button7.Text == "0")
            {
                String temp;
                temp = button7.Text;
                button7.Text = button6.Text;
                button6.Text = temp;
            }
            else
                MessageBox.Show("不能換");
        }
        private void button7_Click(object sender, EventArgs e)
        {
            if (button3.Text == "0")
            {
                String temp;
                temp = button3.Text;
                button3.Text = button7.Text;
                button7.Text = temp;
            }
            else if (button6.Text == "0")
            {
                String temp;
                temp = button6.Text;
                button6.Text = button7.Text;
                button7.Text = temp;
            }
            else if (button10.Text == "0")
            {
                String temp;
                temp = button10.Text;
                button10.Text = button7.Text;
                button7.Text = temp;
            }
            else
                MessageBox.Show("不能換");
        }
        private void button9_Click(object sender, EventArgs e)
        {
            if (button6.Text == "0")
            {
                String temp;
                temp = button6.Text;
                button6.Text = button9.Text;
                button9.Text = temp;
            }
            else if (button8.Text == "0")
            {
                String temp;
                temp = button8.Text;
                button8.Text = button9.Text;
                button9.Text = temp;
            }
            else if (button10.Text == "0")
            {
                String temp;
                temp = button10.Text;
                button10.Text = button9.Text;
                button9.Text = temp;
            }
            else
                MessageBox.Show("不能換");
        }
        private void button10_Click(object sender, EventArgs e)
        {
            if (button7.Text == "0")
            {
                String temp;
                temp = button7.Text;
                button7.Text = button10.Text;
                button10.Text = temp;
            }
            else if (button9.Text == "0")
            {
                String temp;
                temp = button9.Text;
                button9.Text = button10.Text;
                button10.Text = temp;
            }
            else
                MessageBox.Show("不能換");
        }

    }
}
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小算盤(按鍵自己拉)
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        public string str = ""; //此字串用於存取使用者點擊的數字鍵
        public double all = 0;//用於計算結果暫存變數
        public int how = 0;//用於判斷使用者按下的運算元
        public Form1()
        {
            InitializeComponent();
        }
        private void button3_Click(object sender, EventArgs e)
        {
            if (str == "0") { str = ""; }
            str += "2";
            textBox1.Text = str;
        }
        private void button1_Click(object sender, EventArgs e)
        {
            if (str == "0") { str = ""; }
            str += "0";
            textBox1.Text = str;
        }
        private void button2_Click(object sender, EventArgs e)
        {
            if (str == "0") { str = ""; }//若字串內容只有,則可視為沒有內容
            str += "1"; //字串內容+"1"
            textBox1.Text = str;//顯示字串內容
        }
        private void button4_Click(object sender, EventArgs e)
        {
            if (str == "0") { str = ""; }
            str += "3";
            textBox1.Text = str;
        }
        private void button5_Click(object sender, EventArgs e)
        {
            if (str == "0") { str = ""; }
            str += "4";
            textBox1.Text = str;
        }
        private void button6_Click(object sender, EventArgs e)
        {
            if (str == "0") { str = ""; }
            str += "5";
            textBox1.Text = str;
        }
        private void button7_Click(object sender, EventArgs e)
        {
            if (str == "0") { str = ""; }
            str += "6";
            textBox1.Text = str;
        }
        private void button8_Click(object sender, EventArgs e)
        {
            if (str == "0") { str = ""; }
            str += "7";
            textBox1.Text = str;
        }
        private void button9_Click(object sender, EventArgs e)
        {
            if (str == "0") { str = ""; }
            str += "8";
            textBox1.Text = str;
        }
        private void button10_Click(object sender, EventArgs e)
        {
            if (str == "0") { str = ""; }
            str += "9";
            textBox1.Text = str;
        }
        private void button16_Click(object sender, EventArgs e)
        {
            str = "";    //讓變數都初始化
            textBox1.Text = "0";
        }
        private void button11_Click(object sender, EventArgs e)
        {
            if (how == 1)
            { if (str == "") { str = "0"; };all += Convert.ToDouble(str); }
            else if (how == 2)
            { if (str == "") { str = "0"; };all -= Convert.ToDouble(str); }
            else if (how == 3)
            { if (str == "") { str = "1"; };all *= Convert.ToDouble(str); }
            else if (how == 4)
            { if (str == "") { str = "1"; };all /= Convert.ToDouble(str); }
            else if (how == 0)
            { if (str == "") { str = "0"; } all = Convert.ToDouble(str); }
            textBox1.Text = Convert.ToString(all);

            how = 1;
            label1.Text = " +";
            str = "";
        }
        private void button15_Click(object sender, EventArgs e)
        {
            if (str != "")//點擊=鍵還需判斷使用者是否輸入了數字內容
            {  //how用於判斷使用者按壓了哪一個運算字元.1:+  2:-  3:*  4:/   0:=,代表歸零
                //先執行上一步使用者所選擇的運算元
                if (how == 1) { all += Convert.ToDouble(str); }
                else if (how == 2) { all -= Convert.ToDouble(str); }
                else if (how == 3) { all *= Convert.ToDouble(str); }
                else if (how == 4) { all /= Convert.ToDouble(str); }
                else if (all == 0) { all = Convert.ToDouble(str); }
                else all = Convert.ToDouble(str);
            }

            how = 0;//再儲存使用者所按下的運算元
            label1.Text = "=";
            str = Convert.ToString(all);
            textBox1.Text = str;
        }
        private void button12_Click(object sender, EventArgs e)
        {
            if (how == 1)
            { if (str == "") { str = "0"; };all += Convert.ToDouble(str); }
            else if (how == 2)
            { if (str == "") { str = "0"; };all -= Convert.ToDouble(str); }
            else if (how == 3)
            { if (str == "") { str = "1"; };all *= Convert.ToDouble(str); }
            else if (how == 4)
            { if (str == "") { str = "1"; };all /= Convert.ToDouble(str); }
            else if (how == 0)
            { if (str == "") { str = "0"; } all = Convert.ToDouble(str); }
            textBox1.Text = Convert.ToString(all);

            how = 2;
            label1.Text = " -";
            str = "";
        }
        private void button13_Click(object sender, EventArgs e)
        {
            if (how == 1)
            { if (str == "") { str = "0"; };all += Convert.ToDouble(str); }
            else if (how == 2)
            { if (str == "") { str = "0"; };all -= Convert.ToDouble(str); }
            else if (how == 3)
            { if (str == "") { str = "1"; };all *= Convert.ToDouble(str); }
            else if (how == 4)
            { if (str == "") { str = "1"; };all /= Convert.ToDouble(str); }
            else if (how == 0)
            { if (str == "") { str = "0"; } all = Convert.ToDouble(str); }
            textBox1.Text = Convert.ToString(all);

            how = 3;
            label1.Text = " *";
            str = "";
        }
        private void button14_Click(object sender, EventArgs e)
        {
            if (how == 1)
            { if (str == "") { str = "0"; };all += Convert.ToDouble(str); }
            else if (how == 2)
            { if (str == "") { str = "0"; };all -= Convert.ToDouble(str); }
            else if (how == 3)
            { if (str == "") { str = "1"; };all *= Convert.ToDouble(str); }
            else if (how == 4)
            { if (str == "") { str = "1"; };all /= Convert.ToDouble(str); }
            else if (how == 0)
            { if (str == "") { str = "0"; } all = Convert.ToDouble(str); }
            textBox1.Text = Convert.ToString(all);

            how = 4;
            label1.Text = " /";
            str = "";
        }
    }
}