检查四个球那个不一样.frm

Visual Basic课程举例1 有很好的例题

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "判断哪个球和其它不一样"
   ClientHeight    =   3675
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   5235
   BeginProperty Font 
      Name            =   "宋体"
      Size            =   12
      Charset         =   134
      Weight          =   400
      Underline       =   0   'False
      Italic          =   0   'False
      Strikethrough   =   0   'False
   EndProperty
   LinkTopic       =   "Form1"
   ScaleHeight     =   3675
   ScaleWidth      =   5235
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton Command1 
      BackColor       =   &H00FF8080&
      Caption         =   "查找"
      BeginProperty Font 
         Name            =   "华文行楷"
         Size            =   36
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   1605
      Left            =   3240
      Style           =   1  'Graphical
      TabIndex        =   9
      Top             =   1080
      Width           =   1815
   End
   Begin VB.TextBox Text4 
      Height          =   375
      Left            =   2040
      TabIndex        =   7
      Text            =   "1"
      Top             =   2520
      Width           =   975
   End
   Begin VB.TextBox Text3 
      Height          =   375
      Left            =   2040
      TabIndex        =   6
      Text            =   "1"
      Top             =   2040
      Width           =   975
   End
   Begin VB.TextBox Text2 
      Height          =   375
      Left            =   2040
      TabIndex        =   5
      Text            =   "1"
      Top             =   1560
      Width           =   975
   End
   Begin VB.TextBox Text1 
      Height          =   375
      Left            =   2040
      TabIndex        =   4
      Text            =   "1"
      Top             =   1080
      Width           =   975
   End
   Begin VB.Label Label6 
      BackColor       =   &H00C0FFC0&
      Caption         =   "说明：应该输入3个一样的和一个不一样的数值，如果不是这样，程序会做出检测。你可以随便输输试试！"
      Height          =   735
      Left            =   600
      TabIndex        =   10
      Top             =   120
      Width           =   3975
   End
   Begin VB.Label LblMsg 
      BackColor       =   &H00C0C0FF&
      Height          =   495
      Left            =   120
      TabIndex        =   8
      Top             =   3000
      Width           =   4935
   End
   Begin VB.Label Label4 
      AutoSize        =   -1  'True
      Caption         =   "第4个球的重量:"
      Height          =   240
      Left            =   240
      TabIndex        =   3
      Top             =   2580
      Width           =   1680
   End
   Begin VB.Label Label3 
      AutoSize        =   -1  'True
      Caption         =   "第3个球的重量:"
      Height          =   240
      Left            =   240
      TabIndex        =   2
      Top             =   2100
      Width           =   1680
   End
   Begin VB.Label Label2 
      AutoSize        =   -1  'True
      Caption         =   "第2个球的重量:"
      Height          =   240
      Left            =   240
      TabIndex        =   1
      Top             =   1620
      Width           =   1680
   End
   Begin VB.Label Label1 
      AutoSize        =   -1  'True
      Caption         =   "第1个球的重量:"
      Height          =   240
      Left            =   240
      TabIndex        =   0
      Top             =   1140
      Width           =   1680
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False

' 单分支选择结构及逻辑运算符应举例
'
' 作者：曹新国
' 日期：2008年3月26日
'
'


Private Sub Command1_Click()
Dim A!, B!, C!, D!

A = Val(Text1)  '从文本框中取得出各个球的重量
B = Val(Text2)
C = Val(Text3)
D = Val(Text4)

' 注： Exit Sub 是退出本事件处理过程，不再执行后面的语句
If A = B And C = D And A = C Then LblMsg = "4个球全一样！": Exit Sub

If A <> B And A <> C And A <> D And _
   B <> C And B <> D And C <> D Then LblMsg = "4个球全不一样！": Exit Sub
   
If A = B And C = D And A <> C Or _
   A = C And B = D And A <> B Or _
   A = D And B = C And A <> B Then LblMsg = "俩俩一样！": Exit Sub
   
If A = B And A <> C And A <> D Or _
   A = C And A <> B And A <> D Or _
   A = D And A <> B And A <> C Or _
   B = C And B <> A And B <> D Or _
   B = D And B <> A And B <> C Or _
   C = D And C <> B And C <> A Then LblMsg = "俩一样，俩不一样！": Exit Sub
   
   
If A = B And A <> D Then LblMsg = "你要找的球是D（第4个）"
If A = B And A <> C Then LblMsg = "你要找的球是C（第3个）"
If C = D And C <> B Then LblMsg = "你要找的球是B（第2个）"
If C = D And C <> A Then LblMsg = "你要找的球是A（第1个）"
    
End Sub