例13.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 FRM5_4_5 
   BackColor       =   &H00C0FFFF&
   Caption         =   "5-4-5:人口预测"
   ClientHeight    =   3195
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   7095
   BeginProperty Font 
      Name            =   "宋体"
      Size            =   18
      Charset         =   134
      Weight          =   400
      Underline       =   0   'False
      Italic          =   0   'False
      Strikethrough   =   0   'False
   EndProperty
   LinkTopic       =   "Form1"
   ScaleHeight     =   3195
   ScaleWidth      =   7095
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton Command1 
      Caption         =   "计算"
      Height          =   495
      Left            =   2760
      TabIndex        =   1
      Top             =   1800
      Width           =   1335
   End
   Begin VB.Label Label1 
      BackColor       =   &H0000FF00&
      Caption         =   "世界上现有人口60亿,如果以每年1.4%的速度增长,多少年后世界人口达到或超过70亿?"
      Height          =   855
      Left            =   120
      TabIndex        =   0
      Top             =   360
      Width           =   6855
   End
End
Attribute VB_Name = "FRM5_4_5"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Sub Command1_Click()
Dim p As Double
Dim r As Single
Dim n As Integer
p = 6000000000#
r = 0.014
n = 0
Do Until p >= 7000000000#
  p = p * (1 + r)
  n = n + 1
Loop
MsgBox (Str(n) & "年后;世界人口达到" & Str(p))
End Sub