試試小算盤

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
    {
        System.Windows.Forms.TextBox[] textBoxes;
        System.Windows.Forms.Button[] Buttons;
        int i=1;
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            textBoxes = new System.Windows.Forms.TextBox[16];
            textBoxes[i] = new TextBox();
            this.Controls.Add(textBoxes[i]);
            textBoxes[i].Location = new System.Drawing.Point(i * 10, 10);
            textBoxes[i].Size = new Size(260, 22);
            Buttons = new System.Windows.Forms.Button[16];
            for (int j = 0; j < 16; j++)
            {
                Buttons[j] = new Button();
                this.Controls.Add(Buttons[j]);
                if (j <= 3)
                    Buttons[j].Location = new System.Drawing.Point(10 + j * 65, 50);
                else if (j > 3 && j <= 7)
                    Buttons[j].Location = new System.Drawing.Point(10 + (j - 4) * 65, 80);
                else if (j > 7 && j <= 11)
                    Buttons[j].Location = new System.Drawing.Point(10 + (j - 8) * 65, 110);
                else if (j > 11 && j <= 15)
                    Buttons[j].Location = new System.Drawing.Point(10 + (j - 12) * 65, 140);
                Buttons[j].Size = new Size(60, 23);
            }
            for (int j = 0; j < 10; j++)
            {
                Buttons[j].Text = "" + j + "";
            }
            for (int j = 10; j < 11; j++)
            { Buttons[j].Text = ".";
            }
            for (int j = 11; j < 12; j++)
            { Buttons[j].Text = "=";
            }
            for (int j = 12; j < 13; j++)
            {
                Buttons[j].Text = "+";
            }
            for (int j = 13; j < 14; j++)
            {
                Buttons[j].Text = "-";
            }
            for (int j = 14; j < 15; j++)
            {
                Buttons[j].Text = "*";
            }
            for (int j = 15; j < 16; j++)
            {
                Buttons[j].Text = "/";
            }

        }
    }
}
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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
    {
        System.Windows.Forms.TextBox[] textBoxes;
        System.Windows.Forms.Button[] Buttons;
        int i = 1, bno,j;
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            textBoxes = new System.Windows.Forms.TextBox[16];
            textBoxes[i] = new TextBox();
            this.Controls.Add(textBoxes[i]);
            textBoxes[i].Location = new System.Drawing.Point(i * 10, 10);
            textBoxes[i].Size = new Size(260, 22);
            Buttons = new System.Windows.Forms.Button[16];
            for (int j = 0; j < 16; j++)
            {
                Buttons[j] = new Button();
                this.Controls.Add(Buttons[j]);
                if (j <= 3)
                    Buttons[j].Location = new System.Drawing.Point(10 + j * 65, 50);
                else if (j > 3 && j <= 7)
                    Buttons[j].Location = new System.Drawing.Point(10 + (j - 4) * 65, 80);
                else if (j > 7 && j <= 11)
                    Buttons[j].Location = new System.Drawing.Point(10 + (j - 8) * 65, 110);
                else if (j > 11 && j <= 15)
                    Buttons[j].Location = new System.Drawing.Point(10 + (j - 12) * 65, 140);
                Buttons[j].Size = new Size(60, 23);
            }
            for (int j = 0; j < 10; j++)
            {
                Buttons[j].Text = "" + j + "";
            }
            for (int j = 10; j < 11; j++)
            {
                Buttons[j].Text = ".";
            }
            for (int j = 11; j < 12; j++)
            {
                Buttons[j].Text = "=";
            }
            for (int j = 12; j < 13; j++)
            {
                Buttons[j].Text = "+";
            }
            for (int j = 13; j < 14; j++)
            {
                Buttons[j].Text = "-";
            }
            for (int j = 14; j < 15; j++)
            {
                Buttons[j].Text = "*";
            }
            for (int j = 15; j < 16; j++)
            {
                Buttons[j].Text = "/";
            }

        }
        public void Buttons_Click(object sender, EventArgs e)
        {
            for (int j = 0; j < 10; ++j)
            {
                Buttons[j].Text = Convert.ToString( j );
                for (int i = 1; i < 2; ++i)
                {
                    j = Convert.ToInt16(textBoxes[i].Text);
                    textBoxes[i].Text=""+j;
                }
            }
            // System.Windows.Forms.MessageBox.Show("You have clicked button " +
            //   ((System.Windows.Forms.Button)sender).Tag.ToString());
            /*String tnum = sender.ToString();
            int tlen = tnum.Length;
            String no = tnum.Substring(tlen);
            for (int j = 0; j < 16; j++)
            {
                if (Buttons[j].Text == no)
                    bno = j;
            }
            switch (bno)
            {
                case 0:
                    MessageBox.Show("0");
                    break;
                case 1:
                    MessageBox.Show("1");
                    break;
                case 2:
                    MessageBox.Show("2");
                    break;
                case 3:
                    MessageBox.Show("3");
                    break;
                case 4:
                    MessageBox.Show("4");
                    break;
                case 5:
                    MessageBox.Show("5");
                    break;
                case 6:
                    MessageBox.Show("6");
                    break;
                case 7:
                    MessageBox.Show("7");
                    break;
                case 8:
                    MessageBox.Show("8");
                    break;
                case 9:
                    MessageBox.Show("9");
                    break;
                case 10:
                    MessageBox.Show("10");
                    break;
                case 11:
                    MessageBox.Show("11");
                    break;
                case 12:
                    MessageBox.Show("12");
                    break;
                case 13:
                    MessageBox.Show("13");
                    break;
                case 14:
                    MessageBox.Show("14");
                    break;
                case 15:
                    MessageBox.Show("15");
                    break;
            }
            */
        }
    }
}