求矩形面积子过程.frm

蒋加伏主编VB程序设计第四版PPT及全部课本源码 北京邮电大学出版社 Visual Basic 程序设计教程（第四版） 主编 蒋加伏 张林峰 找了好久的（不带密码的）

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "例[8-2]子过程——求矩形面积"
   ClientHeight    =   1755
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   4290
   LinkTopic       =   "Form1"
   ScaleHeight     =   1755
   ScaleWidth      =   4290
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton Command1 
      Caption         =   "计算"
      Height          =   495
      Left            =   2374
      TabIndex        =   5
      Top             =   990
      Width           =   1695
   End
   Begin VB.TextBox Text2 
      Height          =   495
      Left            =   934
      TabIndex        =   4
      Top             =   990
      Width           =   1095
   End
   Begin VB.TextBox Text1 
      Height          =   495
      Left            =   934
      TabIndex        =   3
      Top             =   270
      Width           =   1095
   End
   Begin VB.Label Label3 
      Height          =   495
      Left            =   2381
      TabIndex        =   2
      Top             =   390
      Width           =   1695
   End
   Begin VB.Label Label2 
      Caption         =   "矩形宽："
      Height          =   375
      Left            =   214
      TabIndex        =   1
      Top             =   990
      Width           =   735
   End
   Begin VB.Label Label1 
      Caption         =   "矩形长："
      Height          =   375
      Left            =   214
      TabIndex        =   0
      Top             =   390
      Width           =   735
   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()
  Call area(Val(Text1), Val(Text2))
End Sub
Private Sub area(a As Single, b As Single) '子过程
  Dim sum As Double
  sum = a * b
  Label3.Caption = "矩形面积为: " + Str(sum)
End Sub