form1.frm

vb电子书籍

VERSION 5.00
Begin VB.Form Form1 
   BackColor       =   &H00E0E0E0&
   Caption         =   "数值积分 "
   ClientHeight    =   3195
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   4680
   FillColor       =   &H00C0C0C0&
   BeginProperty Font 
      Name            =   "宋体"
      Size            =   12
      Charset         =   134
      Weight          =   400
      Underline       =   0   'False
      Italic          =   0   'False
      Strikethrough   =   0   'False
   EndProperty
   Icon            =   "Form1.frx":0000
   LinkTopic       =   "Form1"
   MaxButton       =   0   'False
   ScaleHeight     =   3195
   ScaleWidth      =   4680
   StartUpPosition =   2  '屏幕中心
   Begin VB.CommandButton Command1 
      Caption         =   "Command1"
      Height          =   375
      Left            =   1560
      TabIndex        =   0
      Top             =   2280
      Width           =   1695
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Public Function trapez(ByVal a!, ByVal b!, ByVal n%) As Single
  Dim sum!, h1, x!
  h = (b - a) / n
  sum = (f(a) + f(b)) / 2
    For i = 1 To n - 1
      x = a + i * h
      sum = sum + f(x)
    Next i
  trapez = sum * h
End Function

Private Sub Command1_Click()
  Print trapez(1, 3, 30)
End Sub
Public Function f(ByVal x!)
  f = x * x * x + 2 * x + 5
End Function

Private Sub Form_Load()

End Sub