零有點問題，而且目前只能做一些簡單的運算，+、-、*、/、平方、開根號
希望有大佬指正我的錯誤
感謝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;
public partial class form1 : form
double a;//第乙個運算數
double b;//第二個運算數
string d;//結果
public form1()
initializecomponent();
private void button1_click(object sender, eventargs e)
textbox1.text += "1";
private void button2_click(object sender, eventargs e)
textbox1.text += "2";
private void button3_click(object sender, eventargs e)
textbox1.text += "3";
private void button4_click(object sender, eventargs e)
textbox1.text += "4";
private void button5_click(object sender, eventargs e)
textbox1.text += "5";
private void button6_click(object sender, eventargs e)
textbox1.text += "6";
private void button7_click(object sender, eventargs e)
textbox1.text += "7";
private void button8_click(object sender, eventargs e)
textbox1.text += "8";
private void button9_click(object sender, eventargs e)
textbox1.text += "9";
private void button16_click(object sender, eventargs e)
textbox1.text += "0";
if (d == "/")
messagebox.show("除數不能為零", "錯誤提示", messageboxbuttons.ok, messageboxicon.warning);
private void button14_click(object sender, eventargs e)
b = double.parse(textbox1.text);//parse 解析，把字串轉化為整型，轉換資料型別
textbox1.text = "";
d = "+";
private void button15_click(object sender, eventargs e)
b = double.parse(textbox1.text);
textbox1.text = "";
d = "-";
private void button12_click(object sender, eventargs e)
b = double.parse(textbox1.text);
textbox1.text = "";
d = "*";
private void button13_click(object sender, eventargs e)
b = double.parse(textbox1.text);
textbox1.text = "";
d = "/";
private void button10_click(object sender, eventargs e)
b = double.parse(textbox1.text);
textbox1.text = "";
d = "pow";
private void button11_click(object sender, eventargs e)
b = double.parse(textbox1.text);
textbox1.text = "";
d = "sqrt";
private void button18_click(object sender, eventargs e)
switch (d)
case "+": a=b+ double.parse(textbox1.text);
break;
case "-": a = b - double.parse(textbox1.text);
break;
case "*": a = b * double.parse(textbox1.text);
break;
case "/": a = b / double.parse(textbox1.text);
break;
case "pow": a = math.pow(b,2.0);
break;
case "sqrt": a = math.sqrt(b);
break;
textbox1.text = a + "";
private void button19_click(object sender, eventargs e)
textbox1.text = "";
private void button17_click(object sender, eventargs e)//小數點
if (textbox1.text != "")
textbox1.text += ".";
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