例2.frm

在VB5环境下开发的VB程序集,窗体控件源代码.

VERSION 5.00
Begin VB.Form FRM8_6_3 
   Caption         =   "例2: SUB(传址)"
   ClientHeight    =   3090
   ClientLeft      =   60
   ClientTop       =   450
   ClientWidth     =   4680
   BeginProperty Font 
      Name            =   "宋体"
      Size            =   14.25
      Charset         =   134
      Weight          =   400
      Underline       =   0   'False
      Italic          =   0   'False
      Strikethrough   =   0   'False
   EndProperty
   LinkTopic       =   "Form1"
   ScaleHeight     =   3090
   ScaleWidth      =   4680
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton Command1 
      Caption         =   "计算圆面积"
      Height          =   735
      Left            =   1080
      TabIndex        =   0
      Top             =   480
      Width           =   2175
   End
End
Attribute VB_Name = "FRM8_6_3"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Dim S As Single  '模块级变量
Private Sub Command1_Click()
    Bj = InputBox("请输入圆的半径！")
    Call CirArea(Bj)  '  Bj为形式参数
  MsgBox ("圆面积为" & S & ",但半径已被修改为:" & Bj)
 End Sub

Sub CirArea(r)    '  r为实际参数，传址调用
  S = 3.14159 * r ^ 2
  r = 1000  ' 在子程序中改变形参的值，会影响到实参
End Sub