pexam5_4.frm

深圳大学的vb上机与教学的课件

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "求分段函数"
   ClientHeight    =   1785
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   3870
   LinkTopic       =   "Form1"
   ScaleHeight     =   1785
   ScaleWidth      =   3870
   StartUpPosition =   3  '窗口缺省
   Begin VB.TextBox Text2 
      Alignment       =   1  'Right Justify
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   14.25
         Charset         =   134
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   465
      Left            =   1920
      Locked          =   -1  'True
      TabIndex        =   3
      Top             =   960
      Width           =   1575
   End
   Begin VB.TextBox Text1 
      Alignment       =   1  'Right Justify
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   14.25
         Charset         =   134
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   465
      Left            =   1920
      TabIndex        =   0
      Top             =   240
      Width           =   1575
   End
   Begin VB.CommandButton Command1 
      Caption         =   "Y="
      Default         =   -1  'True
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   14.25
         Charset         =   134
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   375
      Left            =   720
      TabIndex        =   1
      Top             =   960
      Width           =   975
   End
   Begin VB.Label Label1 
      AutoSize        =   -1  'True
      Caption         =   "请输入X:"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   14.25
         Charset         =   134
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   285
      Left            =   480
      TabIndex        =   2
      Top             =   360
      Width           =   1245
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False


Private Sub Command1_Click()
  X = Val(Text1.Text)
  Select Case X
    Case Is < 0
      Y = Exp(X) + Exp(-X)
    Case 0        ' 或 Case Is=0
      Y = 1.25
    Case Is > 0
      Y = Log(X) / Log(10)
  End Select
  Text2.Text = Format(Y, "0.000000")     ' 保留6位小数
End Sub