Visual Basic中,对于文本比较好的处理方式.

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "Form1"
   ClientHeight    =   2790
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   4680
   LinkTopic       =   "Form1"
   ScaleHeight     =   2790
   ScaleWidth      =   4680
   StartUpPosition =   3  '窗口缺省
   Begin VB.TextBox Text1 
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   15
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   420
      Left            =   1680
      TabIndex        =   1
      Text            =   "  "
      Top             =   480
      Width           =   1335
   End
   Begin VB.Label Label1 
      Caption         =   "当前累加值"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   14.25
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   375
      Left            =   1680
      TabIndex        =   0
      Top             =   120
      Width           =   1575
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Sub Form_Load()
    Dim x As Single, Sum As Single
    Show
    Sum = 0
    Do While True    '条件为真，循环无终止进行下去
       x = Val(InputBox("请输入要加入的数(-1表示结束)", _
                     "输入数据"))
       If x = -1 Then
            Exit Do
       End If
       Sum = Sum + x
       Text1.Text = Sum
    Loop
    MsgBox "累加运算结束"
End Sub