form1.frm

计算方法的VB程序

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "龙贝格积分"
   ClientHeight    =   1155
   ClientLeft      =   2625
   ClientTop       =   3450
   ClientWidth     =   4680
   LinkTopic       =   "Form1"
   ScaleHeight     =   1155
   ScaleWidth      =   4680
   Begin VB.CommandButton Command3 
      Caption         =   "About"
      Height          =   615
      Left            =   3840
      TabIndex        =   5
      Top             =   480
      Width           =   615
   End
   Begin VB.CommandButton Command2 
      Caption         =   "End"
      Height          =   615
      Left            =   3240
      TabIndex        =   4
      Top             =   480
      Width           =   615
   End
   Begin VB.CommandButton Command1 
      Caption         =   "Ok"
      Height          =   615
      Left            =   2640
      TabIndex        =   3
      Top             =   480
      Width           =   615
   End
   Begin VB.TextBox Text3 
      Height          =   630
      Left            =   1680
      TabIndex        =   2
      Text            =   "12"
      Top             =   480
      Width           =   855
   End
   Begin VB.TextBox Text2 
      Height          =   615
      Left            =   840
      TabIndex        =   1
      Text            =   "3"
      Top             =   480
      Width           =   855
   End
   Begin VB.TextBox Text1 
      Height          =   615
      Left            =   0
      TabIndex        =   0
      Text            =   "0"
      Top             =   480
      Width           =   855
   End
   Begin VB.Label Label3 
      Caption         =   " 细分区    间数"
      BeginProperty Font 
         Name            =   "楷体_GB2312"
         Size            =   10.5
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   495
      Left            =   1680
      TabIndex        =   8
      Top             =   0
      Width           =   855
   End
   Begin VB.Label Label2 
      Caption         =   "积分上界     b"
      BeginProperty Font 
         Name            =   "楷体_GB2312"
         Size            =   10.5
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   495
      Left            =   840
      TabIndex        =   7
      Top             =   0
      Width           =   855
   End
   Begin VB.Label Label1 
      Caption         =   "积分下界     a"
      BeginProperty Font 
         Name            =   "楷体_GB2312"
         Size            =   10.5
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   495
      Left            =   0
      TabIndex        =   6
      Top             =   0
      Width           =   855
   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()
Dim t1, t2 As Double
Dim m As Integer
Dim sum, h As Double
Dim t(Max) As Double
t1 = Time
m = 1
a = CDbl(Text1.Text)
b = CDbl(Text2.Text)
N = CInt(Text3.Text)
h = b - a
t(0) = h * (f(a) + f(b)) / 2
 For i = 1 To N
    m = 2 * m
    h = h / 2
    sum = 0
    For k = 1 To m / 2
        sum = f(a + h * (2 * k - 1)) + sum
    Next k
    t(i) = t(i - 1) / 2 + h * sum
 Next i
  For i = 0 To N
      R(i, 0) = t(i)
  Next i
  For kk = 1 To N
  For j = k To N
         R(j, kk) = (pow(4, kk) * R(j, kk - 1) - R(j - 1, kk - 1)) / (pow(4, kk) - 1)
      If Abs(R(kk, kk) - R(kk - 1, kk - 1)) < tol Then
      Exit For
      End If
  Next j
  Next kk
  t2 = Time
  Tm = CDbl(t2 - t1) * 24 * 3600
Form1.Hide
Form2.Show
Debug.Print pow(4, 3)
  
End Sub
Private Sub Command2_Click()
End
End Sub

Private Sub Command3_Click()
temp = MsgBox("理学院一队:王元", 64, "关于:作者")
End Sub