form1.frm

Visual Basic 6 大学教程的代码

VERSION 5.00
Begin VB.Form frmMid 
   Caption         =   "Reversing a string with Mid$ and Len"
   ClientHeight    =   1710
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   4680
   LinkTopic       =   "Form1"
   ScaleHeight     =   1710
   ScaleWidth      =   4680
   StartUpPosition =   3  'Windows Default
   Begin VB.TextBox txtInput 
      Height          =   285
      Left            =   0
      TabIndex        =   3
      Top             =   360
      Width           =   4695
   End
   Begin VB.CommandButton cmdReverse 
      Caption         =   "Reverse the string"
      Height          =   375
      Left            =   0
      TabIndex        =   2
      Top             =   720
      Width           =   1815
   End
   Begin VB.TextBox txtOutput 
      Height          =   285
      Left            =   0
      TabIndex        =   1
      Top             =   1440
      Width           =   4695
   End
   Begin VB.Label Label1 
      Caption         =   "The phrase spelled backwards is"
      Height          =   255
      Left            =   0
      TabIndex        =   4
      Top             =   1200
      Width           =   3015
   End
   Begin VB.Label lblInput 
      Caption         =   "Enter phrase"
      Height          =   255
      Left            =   0
      TabIndex        =   0
      Top             =   120
      Width           =   2295
   End
End
Attribute VB_Name = "frmMid"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
' Fig. 8.4
' Using Mid$ and Len to reverse a string
Option Explicit

Private Sub cmdReverse_Click()
   Dim phrase As String, position As Integer
   
   txtOutput.Text = ""
   phrase = txtInput.Text
   
   For position = Len(phrase) To 1 Step -1
      txtOutput.Text = txtOutput.Text & _
                       Mid$(phrase, position, 1)
   Next
   
End Sub