vb:简易计算器（加减乘除）代码

代码如下：

Dim t, t1 As Integer

Dim x, y As Double

Public Sub com()

x = Val(l1.Caption)

Select Case t1

Case Is = 1: y = y + x

Case Is = 2: y = y - x

Case Is = 3: y = y * x

Case Is = 4: y = y / x

End Select

t1 = 0

t = 0

l1.Caption = "0"

End Sub

Private Sub Form_Load()

x = 0

y = 0

t = 0

t1 = 1

End Sub

Private Sub c0_Click(Index As Integer)

If l1.Caption = "0" Then

l1.Caption = "0"

Else

l1.Caption = l1.Caption + "0"

End If

End Sub

Private Sub C1_Click(Index As Integer)

If l1.Caption = "0" Then

l1.Caption = "1"

Else

l1.Caption = l1.Caption + "1"

End If

End Sub

Private Sub c10_Click(Index As Integer)

If t = 0 Then

l1.Caption = l1.Caption + "."

t = 1

End If

End Sub

Private Sub C2_Click(Index As Integer)

If l1.Caption = "0" Then

l1.Caption = "2"

Else

l1.Caption = l1.Caption + "2"

End If

End Sub

Private Sub C3_Click(Index As Integer)

If l1.Caption = "0" Then

l1.Caption = "3"

Else

l1.Caption = l1.Caption + "3"

End If

End Sub

Private Sub C4_Click(Index As Integer)

If l1.Caption = "0" Then

l1.Caption = "4"

Else

l1.Caption = l1.Caption + "4"

End If

End Sub

Private Sub C5_Click(Index As Integer)

If l1.Caption = "0" Then

l1.Caption = "5"

Else

l1.Caption = l1.Caption + "5"

End If

End Sub

Private Sub C6_Click(Index As Integer)

If l1.Caption = "0" Then

l1.Caption = "6"

Else

l1.Caption = l1.Caption + "6"

End If

End Sub

Private Sub C7_Click(Index As Integer)

If l1.Caption = "0" Then

l1.Caption = "7"

Else

l1.Caption = l1.Caption + "7"

End If

End Sub

Private Sub C8_Click(Index As Integer)

If l1.Caption = "0" Then

l1.Caption = "8"

Else

l1.Caption = l1.Caption + "8"

End If

End Sub

Private Sub C9_Click(Index As Integer)

If l1.Caption = "0" Then

l1.Caption = "9"

Else

l1.Caption = l1.Caption + "9"

End If

End Sub

Private Sub z1_Click(Index As Integer)

com

t1 = 1

End Sub

Private Sub z2_Click(Index As Integer)

com

t1 = 2

End Sub

Private Sub z3_Click(Index As Integer)

com

t1 = 3

End Sub

Private Sub z4_Click(Index As Integer)

com

t1 = 4

End Sub

Private Sub z5_Click(Index As Integer)

tmp = Mid(l1.Caption, Len(l1.Caption), 1)

If tmp = "." Then

t = 0

End If

If Len(l1.Caption) = 1 Then

l1.Caption = "0"

Else

l1.Caption = Left(l1.Caption, Len(l1.Caption) - 1)

End If

End Sub

Private Sub z6_Click(Index As Integer)

l1.Caption = "0"

Form_Load

End Sub

Private Sub z7_Click(Index As Integer)

If (l1.Caption <>"0") Then

l1.Caption = "-" + l1.Caption

End If

End Sub

Private Sub z8_Click(Index As Integer)

com

l1.Caption = Str(y)

End Sub

扩展资料

语言缺点

Visual Basic 语言具有不支持继承、无原生支持多线程、异常处理不完善等三项明显缺点，使其有所局限性（此些缺点皆已在 vb .net 获得改进）。

不支持继承

VB 5.0 和 VB 6.0 都是基于对象的编程语言，但是不包含继承特性。VB 中提供了特殊的类的功能，但是还是不能满足程序员的需求。

无原生支持多线程

Visual Basic 对于多线程无原生支持，只能通过Windows API的调用实现，且极其的不稳定。因为在API创建的线程中，并没有自动初始化运行时库，导致部分的函数无法使用。一般的，在VB6等早期的VB开发环境下，使用API创建线程的目的是完成容易使程序假死的大量数据或者逻辑的计算。

异常处理不完善

Visual Basic 中内置异常处理，即使未写异常处理代码，一旦用户出错也会d出一个明确写出出错原因对话框，接着程序终止。

Visual Basic 中可以使用 Err.Raise抛出异常。对系统及用户抛出的异常的处理常用两种模式：一是使用 On Error Resume Next 处理错误；另一种是使用 On Error Goto 将运行引入错误处理代码。但相对 C++ 等语言而言，这样的异常处理破坏了代码的结构。

参考资料：百度百科-VB

我们现在首先要做的就是拉出Label，准备三个Label，把label1，label2，label3，这些改成第一个数、第二个数、结果。

我们现在要text也要拉出三个，把了text里面text1、text2、text3全部删掉。

我们现在要把command拉出四个，把里面command1-4都给成+-*/

现在我们现在要双击+，我们开始进行输入代码

在里面我们现在要：text3.text=val(text1.text)+val(text2.text)

我们要把这个（text3.text=val(text1.text)+val(text2.text)）复制，把里面+号分别改成-*/

如图，就像这样就可以了，可以行径了，如果你在哪个代码里弄错了，你看一下还要哪些没有拉出来，或者你哪个代码输错了。

感谢观看。

Dim N1 As Single

Dim ysf As String

Dim qing As Boolean

Dim M As Single

Private Sub C_Click(Index As Integer)

If qing = True Then

L.Caption = ""

qing = False

End If

L.Caption = L.Caption &C(Index).Caption

End Sub

Private Sub Command1_Click()

qing = True

Dim N2 As Single

Dim T As Single

N2 = Val(L.Caption)

Select Case ysf

Case "+"

T = N1 + N2

Case "-"

T = N1 - N2

Case "*"

T = N1 * N2

Case "/"

T = N1 / N2

End Select

L.Caption = T

End Sub

Private Sub Command10_Click()

M = Val(L.Caption)

L1.Caption = "M"

End Sub

Private Sub Command11_Click()

M = M + Val(L.Caption)

End Sub

Private Sub Command2_Click()

L.Caption = -Val(L.Caption)

End Sub

Private Sub Command3_Click()

If L.Caption <>"" Then

L.Caption = Left(L.Caption, Len(L.Caption) - 1)

End If

End Sub

Private Sub Command4_Click()

N1 = 0

L.Caption = ""

ysf = "+"

End Sub

Private Sub Command5_Click()

L.Caption = ""

End Sub

Private Sub Command6_Click()

L.Caption = Sqr(Val(L.Caption))

qing = True

End Sub

Private Sub Command7_Click()

L.Caption = 1 / (Val(L.Caption))

End Sub

Private Sub Command8_Click()

M = 0

L1.Caption = ""

End Sub

Private Sub Command9_Click()

L.Caption = M

End Sub

Private Sub Form_Load()

ysf = "+"

End Sub

Private Sub s_Click(Index As Integer)

N1 = L.Caption

ysf = s(Index).Caption

qing = True

End Sub

Private Sub xsd_Click()

If qing = True Then

L.Caption = ""

qing = False

End If

If InStr(1, L.Caption, ".") = 0 Then

L.Caption = L.Caption &"."

End If

End Sub

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