用VB设计一个简单的计算器
vb 简易计算器实验报告
简易计算器课程设计报告一、实验目的:模拟计算器的功能。
系统启动后, 先清屏, 再在显示屏右侧显示0字样, 系统仅接收数字键、加减乘除键、退格键、C键(复位)、=或回车键、ESC键(退出系统)作为有效按键, 其余按键不响应。
按键后屏幕显示效果要达到一般计算器显示屏的同样效果。
不要求设计一般计算器上都具有的M功能。
二、实验设计内容及思想:首先, 创建一个主体框架: 建立程序的主要界面后, 系统自动生成界面的主要窗口生成代码。
对于每个按钮的的代码段中, 分别添加事件触发的处理代码。
分别设立三个显示屏, 第一个显示屏作为“被加数”框, 第二个显示屏作为“加数”框, 第三个显示屏则作为输出框。
四则运算时直接采用计算表达式。
所以, 优先级和运算规则皆宜考虑在内。
在进行除法运算时, 若遇到除数为0, 则运用条件语句执行, 并在输出显示屏上输出“E”。
三角函数、指数、对数、整除、取余等运算, 也是运用类似手法。
考虑到计算器的操作简便性, 所以加入了复位和退出按钮。
三、源程序文件:Private Sub Command1_Click()Dim x As IntegerDim y As Integerx = Text1.Texty = Text2.TextText3.Text = x + yEnd SubPrivate Sub Command10_Click()Dim x As Integerx = Text1.TextText3.Text = Cos(x)End SubPrivate Sub Command11_Click()Dim x As Integerx = Text1.TextText3.Text = Tan(x)End SubPrivate Sub Command12_Click()Dim x As Integerx = Text1.TextText3.Text = Atn(x)End SubPrivate Sub Command13_Click() Dim x As IntegerDim y As Integerx = Text1.Texty = Text2.TextText3.Text = x ^ yEnd SubPrivate Sub Command14_Click() Dim x As Integerx = Text1.TextIf x <= 0 ThenText3.Text = "输入错误"ElseText3.Text = Log(x)End IfEnd SubPrivate Sub Command15_Click() Text3.Text = "此按钮仅作装饰用" End SubPrivate Sub Command2_Click() Dim x As IntegerDim y As Integerx = Text1.Texty = Text2.TextText3.Text = x - yEnd SubPrivate Sub Command3_Click() Dim x As IntegerDim y As Integerx = Text1.Texty = Text2.TextText3.Text = x * yEnd SubPrivate Sub Command4_Click() Dim x As IntegerDim y As Integerx = Text1.Texty = Text2.TextIf y = 0 ThenText3.Text = "E"ElseText3.Text = x / yEnd IfEnd SubPrivate Sub Command5_Click()Dim x As IntegerDim y As Integerx = Text1.Texty = Text2.TextText3.Text = x \ yEnd SubPrivate Sub Command6_Click()Dim x As IntegerDim y As Integerx = Text1.Texty = Text2.TextText3.Text = x Mod yEnd SubPrivate Sub Command7_Click()Text1.Text = ""Text2.Text = ""Text3.Text = " 0" End SubPrivate Sub Command8_Click()EndEnd SubPrivate Sub Command9_Click()Dim x As Integerx = Text1.TextText3.Text = Sin(x)End Sub源代码截图:四、运行结果演示: 加法演示:减法演示: 乘法演示:除法演示:能够整除: 不能够整除:除数为零:。
VB简易计算器代码
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简单计算器(截图附代码)
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简易计算器代码
VB简易计算器代码以下是一个简单的VB计算器代码：```Public Class Form1Dim firstNum As Double ' 第一个数字Dim secondNum As Double ' 第二个数字Dim operation As Integer ' 1-加法，2-减法，3-乘法，4-除法Private Sub Button0_Click(sender As Object, e As EventArgs) Handles Button0.ClickTextBoxResult.Text = TextBoxResult.Text & "0"End SubPrivate Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.ClickTextBoxResult.Text = TextBoxResult.Text & "1"End SubPrivate Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.ClickTextBoxResult.Text = TextBoxResult.Text & "2"End SubHandles Button3.ClickTextBoxResult.Text = TextBoxResult.Text & "3"End SubPrivate Sub Button4_Click(sender As Object, e As EventArgs) Handles Button4.ClickTextBoxResult.Text = TextBoxResult.Text & "4"End SubPrivate Sub Button5_Click(sender As Object, e As EventArgs) Handles Button5.ClickTextBoxResult.Text = TextBoxResult.Text & "5"End SubPrivate Sub Button6_Click(sender As Object, e As EventArgs) Handles Button6.ClickTextBoxResult.Text = TextBoxResult.Text & "6"End SubPrivate Sub Button7_Click(sender As Object, e As EventArgs) Handles Button7.ClickTextBoxResult.Text = TextBoxResult.Text & "7"End SubHandles Button8.ClickTextBoxResult.Text = TextBoxResult.Text & "8"End SubPrivate Sub Button9_Click(sender As Object, e As EventArgs) Handles Button9.ClickTextBoxResult.Text = TextBoxResult.Text & "9"End SubPrivate Sub ButtonDot_Click(sender As Object, e As EventArgs) Handles ButtonDot.ClickIf Not TextBoxResult.Text.Contains(".") ThenTextBoxResult.Text = TextBoxResult.Text & "."End IfEnd SubPrivate Sub ButtonAdd_Click(sender As Object, e As EventArgs) Handles ButtonAdd.ClickfirstNum = Double.Parse(TextBoxResult.Text)TextBoxResult.Text = ""operation = 1End SubPrivate Sub ButtonSubtract_Click(sender As Object, e As EventArgs) Handles ButtonSubtract.ClickfirstNum = Double.Parse(TextBoxResult.Text)TextBoxResult.Text = ""operation = 2End SubPrivate Sub ButtonMultiply_Click(sender As Object, e As EventArgs) Handles ButtonMultiply.ClickfirstNum = Double.Parse(TextBoxResult.Text)TextBoxResult.Text = ""operation = 3End SubPrivate Sub ButtonDivide_Click(sender As Object, e As EventArgs) Handles ButtonDivide.ClickfirstNum = Double.Parse(TextBoxResult.Text)TextBoxResult.Text = ""operation = 4End SubPrivate Sub ButtonClear_Click(sender As Object, e As EventArgs) Handles ButtonClear.ClickTextBoxResult.Text = ""End SubPrivate Sub ButtonEquals_Click(sender As Object, e As EventArgs) Handles ButtonEquals.ClickDim result As DoublesecondNum = Double.Parse(TextBoxResult.Text)Select Case operationCase 1result = firstNum + secondNumCase 2result = firstNum - secondNumCase 3result = firstNum * secondNumCase 4result = firstNum / secondNumEnd SelectTextBoxResult.Text = result.ToStringEnd SubEnd Class```这个计算器包括数字按钮0-9、小数点按钮、加法、减法、乘法、除法和等于按钮。
VB编写简单计算器程序
Option ExplicitDim LastInput As String * 3 '记录上次按下的按键Dim Num1 As Double '第一个操作数Dim Num2 As Double '第二个操作数Dim OptType As Integer '按下哪一个操作符Dim Result As Double '表示运算结果Dim shuzhi As Integer '表示当前采用的shuzhiDim FirstNum As Boolean '是否是第一个操作数Sub keyp(keynum As Integer)Dim CHAR As String * 1CHAR = Chr(keynum)If CHAR = "+" Or keynum = 43 Then Command5(0).Value = TrueIf CHAR = "-" Or keynum = 45 Then Command5(1).Value = TrueIf CHAR = "*" Or keynum = 42 Then Command5(2).Value = TrueIf CHAR = "/" Or keynum = 47 Then Command5(3).Value = TrueIf shuzhi = 2 And CHAR >= "2" And CHAR <= "9" Thenkeynum = 0Exit SubEnd IfIf keynum >= 48 And keynum <= 57 Then Command1(keynum - 48).Value = True If keynum = 46 Then Command2.Value = TrueIf UCase(CHAR) = "C" Then Command3.Value = TrueIf keynum = 27 Then Command4.Value = TrueIf keynum = 61 Then Command6.Value = Truekeynum = 0End SubFunction angle(ByVal j1 As Integer) As Singleangle = j1If Option1.Value Then angle = j1 * 3.14 / 180End FunctionFunction ArcSin(ByVal Num As Single) As SingleIf Num = 1 ThenArcSin = 3.1415926 / 2ElseIf Num = -1 ThenArcSin = 3.1415926 * 3 / 2ElseArcSin = Atn(Num / Sqr(-Num * Num + 1))End IfIf Option1.Value Then ArcSin = ArcSin * 180 / 3.1415926End FunctionFunction ArcCos(ByVal Num As Single) As SingleIf Num = 1 ThenArcCos = 0ElseIf Num = -1 ThenArcCos = 3.1415926ElseArcCos = Atn(-Num / Sqr(-Num * Num + 1)) + 2 * Atn(1)End IfIf Option1.Value Then ArcCos = ArcCos * 180 / 3.1415926 End FunctionFunction jiecheng(ByVal n As Integer) As SingleDim COUNT As Integerjiecheng = 1For COUNT = 1 To njiecheng = jiecheng * COUNTNextEnd FunctionFunction n10to2(ByVal Number As Single) As SingleDim IntN As Long 'Number的整数部分Dim FracN As Single 'Number的小数部分Dim ModN As Integer '整数部分换算时，记录余数Dim RltN As String '换算结果Dim i As IntegerIf InStr(Number, "e") > 0 Or InStr(Number, "E") > 0 Then MsgBox "不能转换以科学记数法表示的数据！"Exit FunctionEnd IfModN = 0'Number = Val(Text1.Text)IntN = Int(Number)FracN = Number - IntN'以下代码用于将十进制的整数部分换算为二进制Do While IntN > 0ModN = IntN Mod 2IntN = IntN \ 2RltN = ModN & RltNLoopRltN = RltN & "."i = 1'以下代码用于将十进制的小数部分换算为二进制Do While i <= 7 Or FracN <> 0FracN = FracN * 2If FracN >= 1 ThenFracN = FracN - 1RltN = RltN & "1"ElseRltN = RltN & "0"End Ifi = i + 1Loopn10to2 = RltN'Option3.Value = TrueEnd FunctionFunction n2to10(ByVal Number As Double) As SingleDim i As Integer, j As IntegerDim IntN As Long, FracN As SingleDim RltN As SingleDim POS As Integer '记录小数点位置If InStr(Number, "e") > 0 Or InStr(Number, "E") > 0 ThenMsgBox "不能转换以科学记数法表示的数据！"Exit FunctionEnd IfOn Error GoTo ErrIntN = Int(Number)FracN = Number - IntNDo While IntN > 0 '换算整数部分RltN = RltN + (IntN Mod 10) * 2 ^ jj = j + 1IntN = IntN \ 10LoopPOS = InStr(1, Str(FracN), ".")j = -1For i = POS + 1 To Len(Str(FracN)) '换算小数部分RltN = RltN + 2 ^ j * Val(Mid(Str(FracN), i, 1))j = j - 1Next in2to10 = RltN'Option4.Value = TrueExit FunctionErr:Text1.Text = "数据太大，溢出！"End FunctionPrivate Sub Command1_Click(Index As Integer)'当按下数字键（0-9）时，向文本框尾部追加数据'并通过变量LastInput记录上次按键为数字键If Len(Text1.Text) > 16 Then Exit SubIf Text1.Text = "0" Or LastInput = "Eqv" Then Text1.Text = ""Text1.Text = Text1.Text & Index '追加数据LastInput = "Num"Command1(0).SetFocusEnd SubPrivate Sub Command1_KeyPress(Index As Integer, KeyAscii As Integer) Call keyp(KeyAscii)End SubPrivate Sub Command2_Click()'按下小数点按钮的处理过程'如果数据位数超出范围，或数据中已包含小数点，退出本过程If Len(Text1.Text) > 16 Or InStr(1, Text1.Text, ".") > 0 _And LastInput <> "Eqv" Then Exit Sub'如果以"."开始输入新数据，在"."前加"0"；'如果在数据输入过程中按下"."，直接将"."追加在数据尾部If LastInput = "Opt" Or LastInput = "Eqv" Or LastInput = "Neg" Then Text1.Text = Text1.Text + "0."ElseText1.Text = Text1.Text + "."End IfLastInput = "Num"Command1(0).SetFocusEnd SubPrivate Sub Command3_Click()'按下"C"(取消) 按钮的Click 事件过程'重新设置并初始化变量。
VB写简易计算器附图
用V B6.0编写简易计算器效果图：废话不多说，直接上步骤一、创建控件组1、创建控件组的方法??首先创建一个命令按钮，调整其大小（觉得合适就行），名称为Command1，Caption属性为数字 0 ；然后进行“复制”和“粘贴”，当选择“粘贴”时，出现对话框提示已有一个同名控件，询问是否创建控件组，选择“是”后，即创建了一个名为“Command”的控件组。
这时，第一个按钮的Index属性值默认为“0”，第二个的Index属性值自动设为“1”，并且大小与第一个按钮相同，只需修改其 Caption 属性为数字“1”并将其拖至合适位置即可。
此后继续使用“粘贴”的方法建立其他控件组中其余按钮，共20个按钮，每建立一个，就将它拖到合适处，并修改相应的Caption属性值。
二、编写代码Dim s1 As Single, s2 As Single, ysf As String'定义两个单精度数变量用与存放参与运算的数,一个字符型存放运算符Private Sub Command1_Click(Index As Integer)Text1.Text = Text1.Text & Command1(Index).Caption'将command1的单击事件与文本框显示的内容连接End SubPrivate Sub Command2_Click()Text1.Text = Text1.Text + "."If (InStr(Text1.Text, ".") = 1) Then'第一位不能为小数Text1.Text = ""End IfIf InStr(Text1.Text, ".") < Len(Text1.Text) Then '防止出现两个小数点Text1.Text = Left(Text1.Text, Len(Text1.Text) - 1)End IfEnd SubPrivate Sub Command3_Click()s2 = Val(Text1.Text) '开始加减乘除运算Select Case ysfCase "+"Text1.Text = s1 + s2Case "-"Text1.Text = s1 - s2Case "*"Text1.Text = s1 * s2Case "/"If s2 = 0 ThenMsgBox "分母不能为零!"Text1.Text = ""ElseText1.Text = s1 / s2End IfEnd SelectText1 = IIf(Left(Text1.Text, 1) = ".", 0 & Text1.Text, Text1.Text) '这个很关键，如果没有这个的话，得出小于1的小数前面没有0End SubPrivate Sub Command4_Click()If Text1.Text = "" Then '文本为空就结束Exit SubEnd IfText1.Text = Left(Text1.Text, Len(Text1.Text) - 1) '文本退一格End SubPrivate Sub Command5_Click()Text1.Text = "" '清除当前框内文本End SubPrivate Sub Command6_Click(Index As Integer)s1 = Val(Text1.Text) '将s1隐藏起来ysf = Command6(Index).CaptionText1.Text = ""End SubPrivate Sub Command7_Click()If Left(Text1.Text, 1) <> "-" Then '判断作为负数Text1.Text = "-" & Text1.TextElseText1.Text = Right(Text1.Text, Len(Text1.Text) - 1)End IfEnd SubPrivate Sub Command8_Click()Text1.Text = Text1.Text * Text1.Text '平方End Sub各位朋友，可以将红色代码复制到相应位置，不清楚的可以全选复制，但是一定要按照我的步骤和给的名称来哦！还可以再添加按钮Private Sub Command9_Click() '这是退出代码EndEnd Sub三、测试，成功的话给个好评哦！谢谢各位下载与支持！这个可以编写作为作业哦！。
使用VB制作计算器程序
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。
VB程序设计——加减乘除运算器
VB程序设计——加减乘除运算器在VB程序设计中，我们可以创建一个简单的加减乘除运算器。
运算器的功能是接收用户输入的两个数和运算符，并根据运算符进行相应的计算，最后将结果输出给用户。
接下来，我们需要编写程序来实现计算功能。
在窗体代码中，我们可以编写一个函数来处理加减乘除运算。
函数代码如下：```vbPrivate Function Calculate(num1 As Double, num2 As Double, operator As String) As DoubleSelect Case operatorCase "+"Return num1 + num2Case "-"Return num1 - num2Case "*"Return num1 * num2Case "/"If num2 <> 0 ThenReturn num1 / num2ElseMessageBox.Show("除数不能为零！", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error)Return Double.NaNEnd IfCase ElseMessageBox.Show("运算符不合法！", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error)Return Double.NaNEnd SelectEnd Function```这个函数接收两个数值和一个运算符作为参数，并根据运算符的值进行相应的计算。
如果运算符不合法或者除数为零，则会弹出一个错误提示框。
```vbPrivate Sub btnCalculate_Click(sender As Object, e As EventArgs) Handles btnCalculate.ClickDim num1 As DoubleDim num2 As DoubleIf Double.TryParse(txtNum1.Text, num1) AndAlsoDouble.TryParse(txtNum2.Text, num2) ThenDim result As Double = Calculate(num1, num2, cmbOperator.SelectedItem.ToString()If Not Double.IsNaN(result) ThenlblResult.Text = result.ToStringEnd IfElseMessageBox.Show("请输入有效的数值！", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error)End IfEnd Sub```最后，我们可以在窗体的Load事件处理程序中为下拉列表框添加运算符选项。
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VB大作业报告
程序功能介绍：
计算器可以进行简单的。
加、减、乘、除、乘方、开方、阶乘、取余和清零。
主要源程序：
设置程序从form2启动。
首先出来一个展示界面，内容包括自己的姓名、班级和所做的课题。
等待时间是3秒。
Private Sub Form_Load()
Label4.Caption = "3"
End Sub
Private Sub Timer1_Timer() “倒计时，当倒计时为0时，一界面隐藏弹出二界面”
Label4.Caption = Label4.Caption - 1
If (Label4.Caption = "0") Then
Form1.Hide
Form2.Show
End If
End Sub
解释：定时器以一定的时间间隔产生Timer事件从而执行相应的时间
过程。
当form2消失后，form3开始运行。
用户名与密码正确时form3消失form出现。
进入计算器的主要界面。
Private Sub Command1_Click()
If Text1.Text <> "******" Then
MsgBox "用户名错误，请重新输入"
Text1.SetFocus
End If
If Text2.Text <> "123" Then
MsgBox "密码不正确，请重新输入"
Text2.SetFocus
ElseIf Text1 = "******" And Text2 = "123" Then
Form2.Hide
Form3.Show
End If
End Sub
Private Sub Text1_Change()
End Sub
解释：利用Msgbox判断输入数据的正确性，否则不允许登录。
然后进入计算器界面：
Private Sub Command1_Click()
Text3.Text = Str(Val(Text1.Text) + Val(Text2.Text)) “加
法运算”
End Sub
Private Sub Command2_Click()
Text3.Text = Str(Val(Text1.Text) - Val(Text2.Text))“减法运算”
End Sub
Private Sub Command3_Click()
Text3.Text = Str(Val(Text1.Text) * Val(Text2.Text))“乘法运算”
End Sub
Private Sub Command4_Click()
Text3.Text = Str(Val(Text1.Text) / Val(Text2.Text))“除法运算”
End Sub
Private Sub Command6_Click()
Text3.Text = Str(Val(Sqr(Text1.Text)))“开方运算”
End Sub
Private Sub Command5_Click()
Text1.Text2 = Str(Val(Text1.Text) * Val(Text1.Text)) “乘方运算”End Sub
Private Sub Command7_Click()
Text1 = ""
Text2 = "" “清零”
Text3 = ""
End Sub
Private Sub Command8_Click()
Dim a#, s#
s = 1
a = Val(Text1)
For i = 1 To a “阶乘运算”
s = s * i
Text3 = s
Next i
End Sub
Private Sub Command9_Click()
Text3 = Str(Val(Text1) Mod (Text2)) “除法取余”End Sub
Private Sub Text1_Change()
End Sub
总体解释：工程主要包括3个界面，第一个界面主要包括（课题、班级、姓名、倒计时器），第二个界面主要包括（用户名、密码，只有二者都输入正确时才能登录进入第三个界面），第三个界面主要包括（计算器的简单运算加、减、乘、除、乘方、开方、阶乘、取余和清零）。