级数和.frm

Visual Basic课程举例1 有很好的例题

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "Form1"
   ClientHeight    =   3195
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   4680
   LinkTopic       =   "Form1"
   ScaleHeight     =   3195
   ScaleWidth      =   4680
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton Command1 
      Caption         =   "求级数和"
      Height          =   735
      Left            =   1080
      TabIndex        =   0
      Top             =   1680
      Width           =   2175
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False

'用函数过程实现求部分级数和
Public Function jishu1(x!, eps#) As Double
    Dim n%, s#, t#
    n = 1
    s = 0
    t = 1
    Do While (Abs(t) >= eps)
        s = s + t
        t = t * x / n
        n = n + 1
    Loop
    jishu1 = s
End Function

 '用子过程实现求部分级数和
 Public Sub jishu2(s#, x!, eps#)
    Dim n%, t#
    n = 1
    s = 0
    t = 1
    Do While (Abs(t) >= eps)
        s = s + t
        t = t * x / n
        n = n + 1
    Loop
End Sub

'主调程序调用函数过程和子过程
Private Sub Command1_Click()
    Dim f1#, f2#
    f1 = jishu1(2#, 0.000001)
    Call jishu2(f2, 2#, 0.000001)
    Print "f1="; f1, "f2="; f2
End Sub