if_then2.frm

vb编程+从基础到实践光盘代码

VERSION 5.00
Begin VB.Form if_then2 
   Caption         =   "方程计算"
   ClientHeight    =   3195
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   4680
   LinkTopic       =   "Form1"
   ScaleHeight     =   3195
   ScaleWidth      =   4680
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton Command3 
      Caption         =   "退出"
      Height          =   495
      Left            =   3240
      TabIndex        =   4
      Top             =   2040
      Width           =   1215
   End
   Begin VB.CommandButton Command2 
      Caption         =   "计算"
      Height          =   495
      Left            =   1680
      TabIndex        =   3
      Top             =   2040
      Width           =   1215
   End
   Begin VB.CommandButton Command1 
      Caption         =   "清除"
      Height          =   495
      Left            =   120
      TabIndex        =   2
      Top             =   2040
      Width           =   1215
   End
   Begin VB.TextBox Text1 
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   18
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   495
      Left            =   1080
      TabIndex        =   1
      Top             =   840
      Width           =   2055
   End
   Begin VB.Label Label1 
      Caption         =   "Y="
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   21.75
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   615
      Left            =   480
      TabIndex        =   0
      Top             =   840
      Width           =   615
   End
End
Attribute VB_Name = "if_then2"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Sub Command2_Click()
Dim x As Double
x = Val(InputBox("请输入X的值："))
If x < 1 Then
y = 1
ElseIf x <= 3 Then y = 2 * x
Else: y = x * x + 5 * x
End If
Text1.Text = y
End Sub

Private Sub Command1_Click()
Text1.Text = ""
End Sub

Private Sub Command3_Click()
End
End Sub