简单计算器VB完美教程

课程设计说明书正文一、题目：计算器的创作和相应程序的编写二、本题的主要功能：通过计算器的创作熟悉各控件的属性和练习程序的编写。

三、程序截图：四、源程序清单：Begin VB.Form Form1Caption = "计算器"ClientHeight = 3765ClientLeft = 165ClientTop = 855ClientWidth = 5355Icon = "Form1.frx":0000LinkTopic = "Form1"LockControls = -1 'TrueScaleHeight = 3765ScaleWidth = 5355StartUpPosition = 3 '窗口缺省Begin mandButton Command4Caption = "="Height = 495Left = 4470TabIndex = 28Top = 3060Width = 735EndBegin mandButton Command3 Caption = "1/x"Height = 495Left = 4470TabIndex = 27Top = 2520Width = 735EndBegin mandButton Command2 Caption = "%"Height = 495Left = 4470TabIndex = 26Top = 1980Width = 735EndBegin mandButton Command1 Caption = "sqrt"Height = 495Left = 4470TabIndex = 25Top = 1440Width = 735EndBegin mandButton cmbDOT Caption = "."Height = 495Left = 2910TabIndex = 24Top = 3060Width = 735EndBegin mandButton cmbZF Caption = "+/-"Height = 495Left = 2130TabIndex = 23Top = 3060Width = 735 EndBegin mandButton cmbSign Caption = "+"Height = 495Index = 3Left = 3690TabIndex = 22Top = 3060Width = 735 EndBegin mandButton cmbSign Caption = "-"Height = 495Index = 2Left = 3690TabIndex = 21Top = 2520Width = 735 EndBegin mandButton cmbSign Caption = "*"Height = 495Index = 1Left = 3690TabIndex = 20Top = 1980Width = 735EndBegin mandButton cmbSign Caption = "/"Height = 495Index = 0Left = 3690TabIndex = 19Top = 1440Width = 735EndBegin mandButton cmbNUM Caption = "9"Height = 495Index = 9Left = 2910TabIndex = 18Top = 1440Width = 735EndBegin mandButton cmbNUM Caption = "8"Height = 495Index = 8Left = 2130TabIndex = 17Top = 1440Width = 735EndBegin mandButton cmbNUM Caption = "7"Height = 495Index = 7Left = 1350TabIndex = 16Width = 735EndBegin mandButton cmbNUM Caption = "6"Height = 495Index = 6Left = 2910TabIndex = 15Top = 1980Width = 735EndBegin mandButton cmbNUM Caption = "5"Height = 495Index = 5Left = 2130TabIndex = 14Top = 1980Width = 735EndBegin mandButton cmbNUM Caption = "4"Height = 495Index = 4Left = 1350TabIndex = 13Top = 1980Width = 735EndBegin mandButton cmbNUM Caption = "3"Height = 495Index = 3TabIndex = 12Top = 2520Width = 735EndBegin mandButton cmbNUM Caption = "2"Height = 495Index = 2Left = 2130TabIndex = 11Top = 2520Width = 735EndBegin mandButton cmbNUM Caption = "1"Height = 495Index = 1Left = 1350TabIndex = 10Top = 2520Width = 735EndBegin mandButton cmbNUM Caption = "0"Height = 495Index = 0Left = 1350TabIndex = 9Top = 3060Width = 735EndBegin mandButton cmbMa Caption = "M+"Left = 150TabIndex = 8Top = 3060Width = 975 EndBegin mandButton cmbMS Caption = "MS"Height = 495Left = 150TabIndex = 7Top = 2520Width = 975 EndBegin mandButton cmbMR Caption = "MR"Height = 495Left = 150TabIndex = 6Top = 1980Width = 975 EndBegin mandButton cmbMC Caption = "MC"Height = 495Left = 150TabIndex = 5Top = 1440Width = 975 EndBegin mandButton cmbC Caption = "C"Height = 495Left = 4020Top = 690Width = 1155EndBegin mandButton cmbCECaption = "CE"Height = 495Left = 2670TabIndex = 3Top = 690Width = 1155EndBegin mandButton cmbbackspace Caption = "Backspace"Height = 495Left = 1380TabIndex = 2Top = 690Width = 1155EndBegin VB.TextBox Text1Alignment = 1 'Right Justify Height = 375Left = 210TabIndex = 0Text = "0."Top = 120Width = 4935EndBegin bel Label2Alignment = 2 'CenterHeight = 255Left = 360TabIndex = 29Top = 840Width = 375EndBegin bel Label1Alignment = 2 'CenterBorderStyle = 1 'Fixed SingleBeginProperty FontName = "宋体"Size = 14.25Charset = 134Weight = 400Underline = 0 'FalseItalic = 0 'FalseStrikethrough = 0 'False EndPropertyHeight = 495Left = 240TabIndex = 1Top = 690Width = 615EndBegin VB.Menu editCaption = "编辑（&E）"EndBegin VB.Menu lookCaption = "查看（&V）"EndBegin VB.Menu helpCaption = "帮助（&H）"EndEndAttribute VB_Name = "Form1"Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = FalseAttribute VB_PredeclaredId = TrueAttribute VB_Exposed = FalseOption ExplicitPrivate Declare Function ShowCursor Lib "user32" (ByVal bShow As Long) As Long Dim dotflag As BooleanDim fuhao As StringDim first As DoubleDim second As DoubleDim isEqual As BooleanDim memory As Double '保存显示的数据Dim lianyong As Double '当连续按等号时使用该变量Private Declare Function ShowCursor Lib "user32" (ByVal bShow As Long) As Long Dim dotflag As BooleanDim fuhao As StringDim first As DoubleDim second As DoubleDim isEqual As BooleanDim memory As Double '保存显示的数据Dim lianyong As Double '当连续按等号时使用该变量Private Sub cmbDesign_Click(Index As Integer)End SubPrivate Sub cmbbackspace_Click()If Right(Trim(Text1.Text), 1) = "." ThenText1.Text = Mid(Text1.Text, 1, Len(Text1.Text) - 2) & "."ElseText1.Text = Mid(Text1.Text, 1, Len(Text1.Text) - 1)End IfIf Right(Text1.Text, 1) = "." Thendotflag = FalseEnd IfIf Len(Text1.Text) = 1 ThenText1.Text = "0."End IfEnd Sub 单击Backspace时删除文本框内最后一个字符Private Sub cmbC_Click()dotflag = FalseText1.Text = "0."first = 0second = 0End Sub 使文本框变成初始状态“0.”Private Sub cmbCE_Click()Text1.Text = "0."End Sub 删除文本框内的所有内容，使文本框变成初始状态“0.”Private Sub cmbDOT_Click()'标示点击了点“。

VB简易计算器代码下面是一个简单的VB计算器代码，用于执行基本的加、减、乘、除运算。

```vbOption Strict OnPublic Class CalculatorPrivate Sub btnAdd_Click(sender As Object, e As EventArgs) Handles btnAdd.ClickDim num1 As Double = CDbl(txtNum1.Text)Dim num2 As Double = CDbl(txtNum2.Text)Dim result As Double = num1 + num2txtResult.Text = result.ToStringEnd SubPrivate Sub btnSubtract_Click(sender As Object, e As EventArgs) Handles btnSubtract.ClickDim num1 As Double = CDbl(txtNum1.Text)Dim num2 As Double = CDbl(txtNum2.Text)Dim result As Double = num1 - num2txtResult.Text = result.ToStringPrivate Sub btnMultiply_Click(sender As Object, e As EventArgs) Handles btnMultiply.ClickDim num1 As Double = CDbl(txtNum1.Text)Dim num2 As Double = CDbl(txtNum2.Text)Dim result As Double = num1 * num2txtResult.Text = result.ToStringEnd SubPrivate Sub btnDivide_Click(sender As Object, e As EventArgs) Handles btnDivide.ClickDim num1 As Double = CDbl(txtNum1.Text)Dim num2 As Double = CDbl(txtNum2.Text)If num2 = 0 ThenMessageBox.Show("除数不能为0！", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error)ElseDim result As Double = num1 / num2txtResult.Text = result.ToStringEnd IfEnd Sub```此代码创建了一个简单的窗体应用程序，其中包含两个文本框用于输入两个数字，四个按钮用于执行不同的计算操作，以及一个文本框用于显示结果。

VB程序简单计算器最近学完VB，感觉很好，写了个计算器程序，虽然花了不少时间，可也着实高兴。

其中遇到很多问题，最终也在各种资料中得到解决。

现在附上截图和全部代码，希望和大家交流一下，相互学习。

也希望能帮助到准备做计算器的同学。

计算器最终执行文件图标：计算器包括三个窗体（form）：主页面form1：其中的“欢迎各位到此一游”是闪烁效果，呵呵，是自己想着无聊，就想出这么个玩意。

与计算器计算功能无关。

具体实现看下来代码。

Form1的实现代码：Public haha As BooleanPrivate Sub Command1_Click()Dim a As Integera = MsgBox("亲爱的你，真的想要退出本系统吗？", _vbYesNo + vbInformation + vbDefaultButton1, "退出系统前的询问撒(⊙o⊙)")If a = 6 Then '表示当选择“是”的时候的返回值EndEnd IfEnd SubPrivate Sub Command2_Click()Me.HideForm2.ShowEnd SubPrivate Sub Command3_Click()Me.HideForm3.ShowEnd SubPrivate Sub Form_Load()haha = FalseEnd SubPrivate Sub Timer1_Timer()haha = Not hahaIf haha ThenLabel2.ForeColor = &HFF00FFElseLabel2.ForeColor = vbWhiteEnd IfEnd Sub有些像图像等一些可见的控件属性就没在代码里写了，直接在属性里设置了。

页面（form2）：此页面将鼠标点上去，还有意想不到的效果喲。

全部代码为：Dim isFocus1, isFocus2 As BooleanPrivate Sub Command1_Click()If isFocus1 Then '判断焦点在那个文本框中，便于实现按钮输入Text1.Text = Text1.Text & 0End IfIf isFocus2 ThenText2.Text = Text2.Text & 0End IfEnd SubPrivate Sub Command10_Click() If isFocus1 ThenText1.Text = Text1.Text & 9 End IfIf isFocus2 ThenText2.Text = Text2.Text & 9 End IfEnd SubPrivate Sub Command11_Click() If isFocus1 ThenText1.Text = Text1.Text & "." End IfIf isFocus2 ThenText2.Text = Text2.Text & "." End IfEnd SubPrivate Sub Command12_Click() If isFocus1 ThenText1.Text = -Val(Text1.Text)End IfIf isFocus2 ThenText2.Text = -Val(Text2.Text)End IfEnd SubPrivate Sub Command13_Click()Dim a As Integera = Val(Text1.Text) + Val(Text2.Text)Text3.Text = Val(Text1.Text) & "+" & Val(Text2.Text) & "=" & aIf Text1.Text = "" Or Text2.Text = "" ThenMsgBox "哼哼，双目运算一定要是两个数喔" & vbCrLf & vbCrLf & _ "不用说，补上去是必须的撒", vbCritical, "温馨小提醒(*^__^*)" End IfEnd SubPrivate Sub Command14_Click()Dim a As Integera = Val(Text1.Text) - Val(Text2.Text)Text3.Text = Val(Text1.Text) & "-" & Val(Text2.Text) & "=" & aIf Text1.Text = "" Or Text2.Text = "" ThenMsgBox "哼哼，双目运算一定要是两个数喔" & vbCrLf & vbCrLf & _ "不用说，补上去是必须的撒", vbCritical, "温馨小提醒(*^__^*)" End IfEnd SubPrivate Sub Command15_Click()a = Val(Text1.Text) * Val(Text2.Text)Text3.Text = Val(Text1.Text) & "×" & Val(Text2.Text) & "=" & aIf Text1.Text = "" Or Text2.Text = "" ThenMsgBox "哼哼，双目运算一定要是两个数喔" & vbCrLf & vbCrLf & _ "不用说，补上去是必须的撒", vbCritical, "温馨小提醒(*^__^*)" End IfEnd SubPrivate Sub Command16_Click() '除法的特殊性，除数不能为零If Val(Text2.Text) Thena = Val(Text1.Text) / Val(Text2.Text)Text3.Text = Val(Text1.Text) & "÷" & Val(Text2.Text) & "=" & aIf Text1.Text = "" Or Text2.Text = "" ThenMsgBox "哼哼，双目运算一定要是两个数喔" & vbCrLf & vbCrLf & _ "不用说，补上去是必须的撒", vbCritical, "温馨小提醒(*^__^*)" End IfElseText3.Text = "无穷大∞"MsgBox "亲，除数不可以为零的哟！", vbInformation, "矮油，不得了嘞(*^__^*)"Text2.Text = ""Text2.SetFocusEnd IfEnd SubPrivate Sub Command17_Click() '实现清零，并将焦点给文本框1Text1.Text = ""Text2.Text = ""Text3.Text = ""Text1.SetFocusEnd SubPrivate Sub Command18_Click()Me.Hide '进入计算器1Form1.ShowEnd SubPrivate Sub Command2_Click() If isFocus1 ThenText1.Text = Text1.Text & 1 End IfIf isFocus2 ThenText2.Text = Text2.Text & 1 End IfEnd SubPrivate Sub Command3_Click() If isFocus1 ThenText1.Text = Text1.Text & 2 End IfIf isFocus2 ThenText2.Text = Text2.Text & 2 End IfEnd SubPrivate Sub Command4_Click() If isFocus1 ThenText1.Text = Text1.Text & 3 End IfIf isFocus2 ThenText2.Text = Text2.Text & 3 End IfEnd SubPrivate Sub Command5_Click() If isFocus1 ThenText1.Text = Text1.Text & 4 End IfIf isFocus2 ThenText2.Text = Text2.Text & 4 End IfEnd SubPrivate Sub Command6_Click() If isFocus1 ThenText1.Text = Text1.Text & 5 End IfIf isFocus2 ThenText2.Text = Text2.Text & 5 End IfEnd SubPrivate Sub Command7_Click() If isFocus1 ThenText1.Text = Text1.Text & 6 End IfIf isFocus2 ThenText2.Text = Text2.Text & 6 End IfEnd SubPrivate Sub Command8_Click() If isFocus1 ThenText1.Text = Text1.Text & 7 End IfIf isFocus2 ThenText2.Text = Text2.Text & 7 End IfEnd SubPrivate Sub Command9_Click() If isFocus1 ThenText1.Text = Text1.Text & 8End IfIf isFocus2 ThenText2.Text = Text2.Text & 8End IfEnd SubPrivate Sub Form_Load()isFocus1 = False: isFocus2 = FalseEnd SubPrivate Sub Form_MouseMove(Button As Integer, Shift As Integer, X As Single, Y As Single)Label4.ForeColor = vbBlackLabel4.FontUnderline = FalseLabel4.FontBold = FalseEnd SubPrivate Sub Label4_Click()Form3.ShowEnd SubPrivate Sub Label4_MouseMove(Button As Integer, Shift As Integer, X AsSingle, Y As Single)Label4.ForeColor = vbGreen Label4.FontUnderline = True Label4.FontBold = True End SubPrivate Sub Text1_GotFocus() isFocus1 = TrueisFocus2 = FalseEnd SubPrivate Sub Text2_GotFocus() isFocus2 = TrueisFocus1 = FalseEnd Sub页面（form3）：这里面的亮点自己找哦。

vb教程编程实例详解VB教程编程实例详解VB（Visual Basic）是一种面向对象的编程语言，它可以用于开发Windows应用程序。

在这里，我们将详细解释一些VB 编程实例，以帮助初学者更好地理解和掌握这门语言。

编程实例1：计算器首先，让我们创建一个计算器的VB程序。

我们将使用VB的窗体和按钮来实现这个功能。

首先，我们需要在窗体上添加一些按钮，如"1"、"2"、"+"、"="等。

然后，我们需要用一个文本框来显示计算结果。

在窗体上双击"+"按钮并添加以下代码：```Private Sub ButtonPlus_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ButtonPlus.ClickDim num1 As IntegerDim num2 As IntegerDim result As Integernum1 = Integer.Parse(TextBoxNum1.Text)num2 = Integer.Parse(TextBoxNum2.Text)result = num1 + num2TextBoxResult.Text = result.ToString()End Sub```在这个代码中，我们首先定义了三个变量：num1、num2和result，用于存储计算结果。

然后，我们使用Integer.Parse方法将文本框中输入的文本转换为整数类型，并将其赋值给num1和num2。

接下来，我们将num1和num2相加，将结果赋值给result，并使用result.ToString()方法将结果转换为字符串类型并显示在结果文本框中。

编程实例2：学生成绩管理系统接下来，让我们创建一个学生成绩管理系统的VB程序。

VB6.0的小程序计算器对于刚入门学习VB6的朋友来说肯定会做些小程序吧，这里就是给大家演示个简单的计算器程序，仅供参考啦。

界面上加减乘除四个按钮分别是cmdAdd、cmdPlus、cmdMultiple、cmdDevide，小数点按钮是cmdDot，负号按钮是cmdMinuse，数字0～9为了偷懒，用了控件数组cmdNumber(0)~ cmdNumber(9)，上面txtShow是显示数字和结果用的，txtOperate是显示中间步骤的。

思路大致是这样，点加减乘除这类操作符的时候，把当前txtShow的值保存在模块变量mstrParam1里，同时把操作符保存到mstrOperate里，按等于号时把先把当前txtShow的值保存在模块变量mstrParam2里，然后对mstrParam1和mstrParam2进行运算，当然要记得设法把String转换成数值进行运算。

转换的过程要注意，这里是用的Variant数据类型，vParam1和vParam2都是Variant 类型，保存的是mstrParam1和mstrParam2的数值。

之所以不用integer、long、double 这些标准类型，是因为这些类型都有大小限制，做出来用着不方便，VB最大的整型long才到 2147483647，这意味着计算器的计算结果只能限制在9位到10位。

而Variant类型可以支持非常大的数，具体多大不清楚，但起码几十位是能够支持的。

另外，最后算完的结果也要做格式化，因为如果数值非常大的话，VB会自动转成科学计数法，所以要用Format函数进行调整。

如果需要源代码的话在我百度空间里留言。

/zhaozhigang517Option ExplicitPrivate Const mstrFORMATDEFAULT As String = "#.##"Private mstrParam1 As String, mstrParam2 As StringPrivate mstrOperate As StringPrivate Sub cmdAdd_Click()mstrParam1 = Trim(txtShow.Text)mstrOperate = "+"txtShow.Text = ""txtOperate.Text = txtOperate.Text & mstrParam1 & vbCrLf txtOperate.Text = txtOperate.Text & mstrOperate & vbCrLfEnd SubPrivate Sub cmdPlus_Click()mstrParam1 = Trim(txtShow.Text)mstrOperate = "-"txtShow.Text = ""txtOperate.Text = txtOperate.Text & mstrParam1 & vbCrLf txtOperate.Text = txtOperate.Text & mstrOperate & vbCrLfEnd SubPrivate Sub cmdMultiple_Click()mstrParam1 = Trim(txtShow.Text)mstrOperate = "*"txtShow.Text = ""txtOperate.Text = txtOperate.Text & mstrParam1 & vbCrLf txtOperate.Text = txtOperate.Text & mstrOperate & vbCrLfEnd SubPrivate Sub cmdDevide_Click()mstrParam1 = Trim(txtShow.Text)mstrOperate = "/"txtShow.Text = ""txtOperate.Text = txtOperate.Text & mstrParam1 & vbCrLftxtOperate.Text = txtOperate.Text & mstrOperate & vbCrLfEnd SubPrivate Sub cmdDot_Click()Dim mstrShow As StringDim i As IntegermstrShow = "."i = InStr(1, txtShow.Text, mstrShow)If i <= 0 ThentxtShow.Text = txtShow.Text & mstrShowEnd IfEnd SubPrivate Sub cmdMinuse_Click()Dim mstrShow As StringDim i As IntegermstrShow = "-"i = InStr(1, txtShow.Text, mstrShow)If i <= 0 ThentxtShow.Text = mstrShow & txtShow.TextElsetxtShow.Text = Right(txtShow.Text, Len(txtShow.Text) - 1) End IfEnd SubPrivate Sub cmdNumber_Click(Index As Integer)Dim mstrShow As StringmstrShow = IndextxtShow.Text = txtShow.Text & mstrShowEnd SubPrivate Sub cmdClear_Click()txtShow.Text = ""End SubPrivate Sub cmdResult_Click()Dim vParam1 As Variant, vParam2 As VariantDim vResult As VariantDim strResult As StringDim i As LongDim blnBeforeDot As BooleanDim lngDotPos As LongDim blnMinuse As BooleanmstrParam2 = Trim(txtShow.Text)txtOperate.Text = txtOperate.Text & mstrParam2 & vbCrLfvParam1 = 0blnBeforeDot = TruelngDotPos = -1blnMinuse = FalseFor i = 1 To Len(mstrParam1)If IsNumeric(Mid(mstrParam1, i, 1)) = True ThenIf blnBeforeDot = True ThenvParam1 = vParam1 * 10 + CByte(Mid(mstrParam1, i, 1))ElsevParam1 = vParam1 + CByte(Mid(mstrParam1, i, 1)) * (0.1 ^ (i - lngDotPos))End IfElseIf Mid(mstrParam1, i, 1) = "." ThenblnBeforeDot = FalselngDotPos = iElseIf Mid(mstrParam1, i, 1) = "-" ThenblnMinuse = TrueEnd IfNext iIf blnMinuse = True ThenvParam1 = -vParam1End IfvParam2 = 0blnBeforeDot = TruelngDotPos = -1blnMinuse = FalseFor i = 1 To Len(mstrParam2)If IsNumeric(Mid(mstrParam2, i, 1)) = True ThenIf blnBeforeDot = True ThenvParam2 = vParam2 * 10 + CByte(Mid(mstrParam2, i, 1))ElsevParam2 = vParam2 + CByte(Mid(mstrParam2, i, 1)) * (0.1 ^ (i - lngDotPos))End IfElseIf Mid(mstrParam2, i, 1) = "." ThenblnBeforeDot = FalselngDotPos = iElseIf Mid(mstrParam2, i, 1) = "-" ThenblnMinuse = TrueEnd IfNext iIf blnMinuse = True ThenvParam2 = -vParam2End IfSelect Case mstrOperateCase "+"vResult = vParam1 + vParam2Case "-"vResult = vParam1 - vParam2Case "*"vResult = vParam1 * vParam2Case "/"vResult = vParam1 / vParam2End SelecttxtOperate.Text = txtOperate.Text & "=" & vbCrLfstrResult = Format(vResult, mstrFORMATDEFAULT)txtShow.Text = strResulttxtOperate.Text = txtOperate.Text & strResult & vbCrLfEnd SubPrivate Sub Form_Load()txtShow.Text = ""txtOperate.Text = ""End Sub（注：可编辑下载，若有不当之处，请指正，谢谢!）。

《VB》课内实验报告学生姓名:及学号：学院:班级: 数学101课程名称：VB实验题目:控件数组的应用指导教师姓名及职称：2012年03月28日目录一、实验目的 (1)二、实验内容 (1)三、实验要点及说明 (1)四、实现方法 (1)五、实验结果 (2)六、源程序清单 (2)七、思考及总结 (4)一、实验目的1．掌握动态数组与静态数组的使用方法。

2．掌握控件数组的添加、删除以及使用方法。

3．掌握If语句、Select Case语句以及循环语句的使用。

4．掌握控件数组中索引号（Index）的作用。

二、实验内容1．制作计算器，完成十进制的加减乘除运算。

2．随机产生15个不重复的A-Z（包括A，Z）的大写字母，存放在字符数组中。

三、实验要点及说明1．利用数组控件完成计算器的制作。

（1）设计界面及设置属性界面设计中的显示部分要求用标签实现；运算符、数字分别使用控件数组实现；（2）编写代码图3-1 设计界面程序代码的任务是单击数字按钮和运算符按钮实现十进制的常规运算，同时要求做到实现正负号的转变、结果的标准输出以及除法中除数的检查等功能。

2．界面设计部分要求能够体现出字符数组中的内容，且实现随机不重复显示的功能，具体参数不做要求。

四、实现方法运行环境：Visual Basic运行开发环境；1．VB6.0窗体的属性设置运用复制的方法建立两个建立控件数组，编写代码。

2. 设置窗体的属性，添加一个文本框MultiLine属性设置成True，编写代码。

五、实验结果1. 能够完成十进制的加减乘除运算，可以判断被除数是否为零，如果为零，弹出对话框提示错误。

2.单击窗体随机出现15个不同的字母。

六、源程序清单1、源程序：Option Explicit ‘对所有变量进行显式声明Dim Num1 As Single, Num2 As Single ‘声明Num1，Num2为单精度浮点型变量Dim Flag As Boolean ‘声明Flag为布尔变量Dim Cul As Integer ‘声明Cul为整型变量Private Sub Command1_Click(Index As Integer) ‘Command1的单击事件Num1 = Val(Text1.Text) ‘Text1中的值赋给Num1Flag = True ‘Flag为真Cul = IndexEnd SubPrivate Sub _Click() ‘Command4的单击事件If InStr(Text1.Text, ".") = 0 And Text1.Text <> "" Then ‘如果Text1中没Text1.Text = Text1.Text + "." 有"."并且不为空，就在Text1中加一个"."End IfEnd SubPrivate Sub Command2_Click(Index As Integer)If Flag Then Text1.Text = "": Flag = False ‘如果Flag为真则Text1赋为空Text1.Text = Text1.Text + Command2(Index).Caption ‘如果为假Text1加End Sub Command2(Index) Private Sub Command5_Click() ‘Command5的单击事件的单击事件Text1.Text = "" ‘清空Text1,Num1, Num2的值Num1 = 0Num2 = 0End SubPrivate Sub Command6_Click() ‘Command6的单击事件Dim result As Single ‘声明result为单精度浮点型变量Num2 = Val(Text1.Text) ‘Text1中的值赋给Num2Flag = True ‘Flag b变为真Select Case Cul ‘Select循环Case 0: result = Num1 + Num2Case 1: result = Num1 - Num2Case 2: result = Num1 * Num2Case 3:If Num2 <> 0 Then ‘若分母为零提示result = Num1 / Num2ElseMsgBox "出错！被0除！"End IfEnd SelectIf result \ 1 <> result Then ‘如果result \ 1不等于result那么在result前Text1.Text = Format(result, "0.#") 加”0.”赋给Text1.TextElseText1.Text = Str(result) ‘否则直接将result转化成字符串赋给Text1.TextEnd IfEnd SubPrivate Sub Command3_Click() ‘Command3的单击事件If Text1.Text <> "" Then ‘如果Text1.Text不是空的If InStr( Text1.Text, "-") = 0 Then ‘Text1.Text中不包含"-"Text1.Text = "-" + Text1.Text ‘把"-" Text1.Text连接后赋给Text1.Text ElseText1.Text = Right(Text1.Text, Len(Text1.Text) - 1)End If ‘取Text1.Text中长度减1的字符赋给Text1.Text End IfEnd Sub2、源程序Private Sub Form_Click() ‘Form的单击事件Dim s(1 To 15) As String * 1, c As String * 1 ‘声明s,c为定长字符串Dim Found As Boolean ‘声明Found为布尔变量s(1) = chr(Int(Rnd * 26 + 65)) ‘将一随机字符赋给s(1)n = 2Do While n <= 15 ‘循环条件n<=15c = chr(Int(Rnd * 26 + 65)) ‘将一随机字符赋给cFound = FalseFor j = 1 To n – 1 ‘For循环If s(j) = c Then Found = TrueNext jIf Not Found Then ‘Found为假，进行下两行语句s(n) = cn = n + 1End IfLoopFor i = 1 To 15 ‘循环输出s(i)到Text1.Text中Text1.Text = Text1.Text & s(i)Next iEnd Sub七、思考及总结。

第 3 章计算器第3 章计算器3.1 开发任务在本任务中，我们要分别实现基本算术运算、累加和计算、阶乘计算、三角函数计算、排列组合计算和对数计算等多个子任务。

3.1.1 计算器的实验版本1. 程序界面设计（1）新建工程打开VB开发环境，在工程浏览器窗口中（见图3-1左），将工程名称改为“计算器”（如图3-1中）；再将窗体名称改为“frmCalculator”如图3-1右）。

图3-1 改变工程和窗体名称将窗体文件保存为“frmCalculator.frm”，工程文件保存为“prjCalculator”。

（2）添加控件在本工程中，我们需要用到下列控件：1个文本框用于输入运算数和输出结果；16个按钮构成计算器键盘，其中10个用于输入10个数字字符，1个用于输入小数点，一个用于触发计算的等号，另外4个用于选择加、减、乘、除运算符。

首先在窗体上部添加一个文本框，默认名称是Text1，调整好大小和位置（如图3-2），并将属性Text的值清空，再将对齐方式Alignment 改成“1 -Right Justify”右对齐；图3-2 添加文本框控件再来制作键盘，第1步，添加第1个按钮。

在文本框下方添加一个按钮Command1，将它调整为一个按键般大小，并把Caption属性改成“1”。

第2步，添加第2个按钮。

添加外形类似的按钮，用复制的方法即可。

不过要注意，在粘贴时VB会询问“已经有一个控件为"Command1 "。

创建一个控件数组吗？”（见图3-3），一定要回答“否”。

将复制好的按钮Command2的Caption改成2，并移动到Command1的右边。

图3-3 创建控件数组询问对话框第3步，重复进行粘贴操作，依次制作其它按钮，按图3-4的布局排列。

前9个按钮的Caption改成与它们的顺序号相同，Command10的Caption改为“0”，Command11的Caption改为“.”，ommand12的Caption改为“=”，Command13～Command16的Caption依次改为“+”、“-”、“*”、“/”。

vb加法计算程序编写
在VB中编写加法计算程序，可以遵循以下步骤：
1. 创建一个新的VB窗体应用程序，命名为“Addition Calculator”。

2. 在窗体中添加以下控件：
- 两个文本框，用于输入两个加数。

- 一个标签，用于显示计算结果。

- 一个按钮，用于触发计算操作。

3. 为按钮添加一个点击事件处理程序，以执行加法计算。

代码
示例：
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim num1, num2, result As Double
num1 = CDbl(TextBox1.Text)
num2 = CDbl(TextBox2.Text)
result = num1 + num2
Label1.Text = '计算结果：' & result
End Sub
4. 运行程序并输入两个加数，点击计算按钮，即可在标签中看
到计算结果。

注意事项：
- 在进行加法计算前，需要将输入的文本框内容转换为数值类型。

这里使用CDbl函数。

- 计算结果也需要将类型转换为字符串类型，以便在标签中显示。

这里使用&连接符将字符串连接起来。

- 在实际开发中，还需要进行输入验证，以确保输入的内容是合法的数值。

多功能计算器界面如下图所示。

实现代码如下：Public b As SinglePublic flag, first As IntegerDim narray(100) As Single '存放文本框1中输入的多个数据Dim i As Integer '存放输入数组的实际长度'单次运算Dim a As Single '存放第一个操作数Dim key As String '存放运算符'以上在模块中定义变量Private Sub cmd0_Click() '单击数字键0Text1.Text = Text1.Text + cmd0.Caption '可用"&"代替"+"End SubPrivate Sub cmd1_Click() '单击数字键1Text1.Text = Text1.Text + cmd1.CaptionEnd SubPrivate Sub cmd2_Click() '单击数字键2Text1.Text = Text1.Text + cmd2.CaptionEnd SubPrivate Sub cmd3_Click() '单击数字键3Text1.Text = Text1.Text + cmd3.CaptionEnd SubPrivate Sub cmd4_Click() '单击数字键4Text1.Text = Text1.Text + cmd4.CaptionEnd SubPrivate Sub cmd5_Click() '单击数字键5Text1.Text = Text1.Text + cmd5.CaptionEnd SubPrivate Sub cmd6_Click() '单击数字键6Text1.Text = Text1.Text + cmd6.CaptionEnd SubPrivate Sub cmd7_Click() '单击数字键7Text1.Text = Text1.Text + cmd7.CaptionEnd SubPrivate Sub cmd8_Click() '单击数字键8Text1.Text = Text1.Text + cmd8.CaptionEnd SubPrivate Sub cmd9_Click() '单击数字键9Text1.Text = Text1.Text + cmd9.CaptionEnd SubPrivate Sub cmddot_Click() '连接小数点Text1.Text = Text1.Text + cmddot.CaptionIf InStr(Text1.Text, ".") < Len(Text1.Text) Then'防止出现多个小数点Text1.Text = Left(Text1.Text, Len(Text1.Text) - 1)End IfEnd SubPrivate Sub cmdcls_Click() '单击CE键Text1.Text = ""End SubPrivate Sub add_Click() '单击“+”，保存第一个操作数和运算符 a = Val(Text1.Text)key = add.CaptionText1.Text = " "End SubPrivate Sub subs_Click() '单击“-”a = Val(Text1.Text)key = subs.CaptionText1.Text = " "End SubPrivate Sub mul_Click() '单击“*”a = Val(Text1.Text)key = mul.CaptionText1.Text = " "End SubPrivate Sub div_Click() '单击“/”a = Val(Text1.Text)key = div.CaptionText1.Text = " "End SubPrivate Sub modi_Click() '单击“Mod”a = Val(Text1.Text)key = more.CaptionText1.Text = " "End SubPrivate Sub mulpi_Click() '单击“^”a = Val(Text1.Text)key = mulpi.CaptionText1.Text = " "End SubPrivate Sub sign_Click() '单击“+/-”,改变操作数符号Text1.Text = -Val(Text1.Text)End SubPrivate Sub equal_Click() '单击“=”Select Case key '判断运算符Case "+": Text1.Text = a + Val(Text1.Text)Case "-": Text1.Text = a - Val(Text1.Text)Case "*": Text1.Text = a * Val(Text1.Text)Case "/": Text1.Text = a / Val(Text1.Text)Case "\": Text1.Text = a \ Val(Text1.Text)Case "mod": Text1.Text = a Mod Val(Text1.Text)Case "^": Text1.Text = a ^ Val(Text1.Text)Case "<": Text1.Text = a < Val(Text1.Text)Case ">": Text1.Text = a > Val(Text1.Text)Case "<>": Text1.Text = a <> Val(Text1.Text)Case "Like": b = "*" & Trim(Text1.Text) & "*"If (Str(a) Like b) Then Text1.Text = True Else Text1.Text = False Case "Not": Text1.Text = Not aCase "And": Text1.Text = a And Val(Text1.Text)Case "Or": Text1.Text = a Or Val(Text1.Text)Case "Xor": Text1.Text = a Xor Val(Text1.Text)End SelectEnd SubPrivate Sub less_Click() '单击“<”a = Val(Text1.Text)key = less.CaptionText1.Text = " "End SubPrivate Sub more_Click() '单击“>”a = Val(Text1.Text)key = more.CaptionText1.Text = " "End SubPrivate Sub notequal_Click() '单击“<>”a = Val(Text1.Text)key = notequal.CaptionText1.Text = " "End SubPrivate Sub likes_Click() '单击“Likes”a = Val(Text1.Text)key = likes.CaptionText1.Text = " "End SubPrivate Sub cmdnot_Click() '单击“Not”a = Val(Text1.Text)key = cmdnot.CaptionText1.Text = " "End SubPrivate Sub cmdand_Click() '单击“And”a = Val(Text1.Text)key = cmdand.CaptionText1.Text = " "End SubPrivate Sub cmdor_Click() '单击“Or”a = Val(Text1.Text)key = cmdor.CaptionText1.Text = " "End SubPrivate Sub cmdxor_Click() '单击“Xor”a = Val(Text1.Text)key = cmdxor.CaptionText1.Text = " "End SubPrivate Sub Command3_Click(Index As Integer) '函数区中功能实现，Command3'为函数区控件数组名Select Case IndexCase 0Text2.Text = Sin(Val(Trim$(Text1.Text))) '调用内部函数sinCase 1Text2.Text = Cos(Val(Trim$(Text1.Text)))Case 2Text2.Text = Abs(Val(Trim$(Text1.Text)))Case 3Text2.Text = Sqr(Val(Trim$(Text1.Text)))Case 4Text2.Text = Hex$(Val(Trim$(Text1.Text)))Case 5Text2.Text = Oct$(Val(Trim$(Text1.Text)))Case 6Text2.Text = Asc(Trim$(Text1.Text))Case 7Text2.Text = Rnd(Val(Trim$(Text1.Text)))Case 8Text2.Text = DateCase 9Text2.Text = Len(Trim$(Text1.Text))Case 10Text2.Text = sum1() '调用自定义函数求和Case 11Text2.Text = ave() '调用自定义函数求平均值Case 12 '12为max命令按钮的控件数组Index值Dim m As SingleCall max2(m) '调用自定义子过程求最大值Text2.Text = m 'm为调用过程得到的最大值'Text2.Text = max() '调用自定义函数过程求最大值Case 13Text2.Text = min() '调用自定义函数过程求最小值Case 14Text2.Text = sort() '调用自定义函数过程排序Case 15'Text2.Text = fac() '调用自定义函数过程求阶乘Text2.Text = fac1(Val(Text1.Text))'调用自定义函数过程求阶乘，用递归实现End SelectEnd SubPrivate Function sum1()Dim k As IntegerDim s As Singles = 0For k = 1 To i - 1s = s + narray(k)Next ksum1 = sEnd FunctionPrivate Function max()Dim k As IntegerDim s As Single, m As Singlem = narray(1)For k = 2 To iIf m < narray(k) Then m = narray(k) Next kmax = mEnd FunctionPrivate Function ave() '求平均值Dim k As IntegerDim s As Single, m As SingleFor k = 1 To is = s + narray(k)Next kave = s / (i - 1)End FunctionPrivate Function min() '求最小值函数Dim k As IntegerDim s As Single, m As Singlem = narray(1)For k = 2 To i - 1If m > narray(k) Then m = narray(k) Next kmin = mEnd FunctionPrivate Function sort() '排序函数Dim k As Integer, j As IntegerDim s As String, m As SingleFor k = 1 To i - 2For j = 1 To i - 1If narray(j) < narray(j + 1) Thenm = narray(j)narray(j) = narray(j + 1)narray(j + 1) = mEnd IfNext jNext kFor k = 1 To i - 1s = s+" "+Str$(narray(k)) '将排序结果存放到字符串s，以便带回到主调程序中Next ksort = sEnd FunctionPrivate Function fac() '求阶乘函数Dim k As Integer, j As IntegerDim m As SingleIf InStr(Trim$(Text1.Text), " ") > 1 Then'如果在文本输入框中输入了多个数据，则计算一个'数据的阶乘j = first '数组元素narray()中第一个元素Else: j = Val(Trim$(Text1.Text))End Ifm = 1For k = 1 To jm = m * kNext kfac = mEnd FunctionPrivate Sub Text1_KeyPress(Keyasc As Integer)'在文本框1中输入多个数据，以空格分隔，按回'车键结束，识别数据存放到数组narray( )中Dim c As StringDim n As Integer, k As Integeri = 1k = 1If Keyasc = 13 Then '按下回车键For n = 0 To Len(Text1.Text) - 1c = Mid$(Text1.Text, n + 1, 1)If c = " " Thennarray(i) = Val(Mid$(Text1.Text, k, n - k + 1))'识别数据存放在数组narray(i)中k = k + Len(Str$(narray(i))) '下一个数据位置起点i = i + 1 '每识别一个数据数组实际长度加1End IfNext nEnd Iffirst = narray(1)End SubPrivate Sub max2(m As Single) '求数组元素的最大值Dim k As Integerm = narray(1)For k = 2 To iIf m < narray(k) Then m = narray(k)Next kEnd SubPrivate Function fac1(n As Long) '递归求阶乘If n > 1 Thenfac1 = fac1(n - 1) * nElsef ac1 = 1End IfEnd Function。