這次的作業對我來說難度很大，所以必須要借助於網上的知識來進行補充，通過上網查資料，結合上課老師所講的內用，還有老師所給-出的一些經典的範例，最重要的是結合我自己原有的知識來進行補充，我終於還是做出了一些成品，但是我最初完成的不能實現，所以這讓我困擾了好久，但是，我經過看到了網上的一些源**，認真學習了之後，才借鑑了過來，要理解才能成為自己的東西！但是，目前只能實現整數的四則運算！
namespace 計算器
public partial class form1 : form
public form1()
initializecomponent();
public string num;
public int flag;//用於判斷輸入的操作符
public double num1, num2;
private void num0_button_click(object sender, eventargs e)
num = num + "0";
num2 = convert.todouble(num);
textbox.text = num;
private void num1_button_click(object sender, eventargs e)//重點演算法1
if (textbox.text == "0")
num = "1";
textbox.text = convert.tostring(num);
else
num = num + "1";
num2 = convert.todouble(num);
textbox.text = num;
private void num2_button_click(object sender, eventargs e)
if (textbox.text == "0")
num = "2";
textbox.text = convert.tostring(num);
else
num = num + "2";
num2 = convert.todouble(num);
textbox.text = num;
private void num3_button_click(object sender, eventargs e)
if (textbox.text == "0")
num = "3";
textbox.text = convert.tostring(num);
else
num = num + "3";
num2 = convert.todouble(num);
textbox.text = num;
private void num4_button_click(object sender, eventargs e)
if (textbox.text == "0")
num = "4";
textbox.text = convert.tostring(num);
else
num = num + "4";
num2 = convert.todouble(num);
textbox.text = num;
private void num5_button_click(object sender, eventargs e)
if (textbox.text == "0")
num = "5";
textbox.text = convert.tostring(num);
else
num = num + "5";
num2 = convert.todouble(num);
textbox.text = num;
private void num6_button_click(object sender, eventargs e)
if (textbox.text == "0")
num = "6";
textbox.text = convert.tostring(num);
else
num = num + "6";
num2 = convert.todouble(num);
textbox.text = num;
private void num7_button_click(object sender, eventargs e)
if (textbox.text == "0")
num = "7";
textbox.text = convert.tostring(num);
else
num = num + "7";
num2 = convert.todouble(num);
textbox.text = num;
private void num8_button_click(object sender, eventargs e)
if (textbox.text == "0")
num = "8";
textbox.text = convert.tostring(num);
else
num = num + "8";
num2 = convert.todouble(num);
textbox.text = num;
private void num9_button_click(object sender, eventargs e)
if (textbox.text == "0")
num = "9";
textbox.text = convert.tostring(num);
else
num = num + "9";
num2 = convert.todouble(num);
textbox.text = num;
private void add_button_click(object sender, eventargs e)//重點演算法2
if (textbox.text.length > 0)
num1 = convert.todouble(textbox .text);
num = "";
flag = 1;
textbox.text = "";
textbox.focus();
private void dev_button_click(object sender, eventargs e)
if (textbox.text.length > 0)
num1 = convert.todouble(textbox.text);
num = "";
flag = 2;
textbox.text = "";
textbox.focus();
private void mul_button_click(object sender, eventargs e)
if (textbox.text.length > 0)
num1 = convert.todouble(textbox.text);
num = "";
flag = 3;
textbox.text = "";
textbox.focus();
private void chu_button_click(object sender, eventargs e)
if (textbox.text.length > 0)
num1 = convert.todouble(textbox.text);
num = "";
flag = 4;
// textbox.text = "";
textbox.focus();
private void equ_button_click(object sender, eventargs e)
switch (flag)
case 1:
textbox.text = convert.tostring(num1+convert .todouble(num));//重點演算法3
num2 = convert.todouble(textbox .text);
break;
case 2:
textbox.text = convert.tostring(num1 - convert.todouble(num));
num2 = convert.todouble(textbox.text);
break;
case 3:
textbox.text = convert.tostring(num1 * convert.todouble(num));
num2 = convert.todouble(textbox.text);
break;
case 4:
textbox.text = convert.tostring(num1 / convert.todouble(num));
num2 = convert.todouble(textbox.text);
break;
private void re_button_click(object sender, eventargs e)
num = "";
textbox.text = "0";
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