弦位法.frm

完整的数值模拟软件

VERSION 5.00
Begin VB.Form Form25 
   BackColor       =   &H00FFFFFF&
   Caption         =   "弦位法"
   ClientHeight    =   5115
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   9540
   LinkTopic       =   "Form15"
   ScaleHeight     =   5115
   ScaleWidth      =   9540
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton Command1 
      Caption         =   "弦位法"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   495
      Left            =   3360
      TabIndex        =   0
      Top             =   120
      Width           =   1575
   End
End
Attribute VB_Name = "Form25"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Sub Command1_Click()
X1 = 1
X2 = 2

k = 1
Cls
Print: Print: Print: Print: Print: Print
Do While True
   x = X1
   Y1 = x ^ 3 + x - 4
   x = X2
   Y2 = x ^ 3 + x - 4
   x = X2 - (Y2 * (X2 - X1)) / (Y2 - Y1)
   y = x ^ 3 + x - 4
   Print Tab(9); "k="; k, "x1="; Int(X1 * 1000000 + 0.5) / 1000000, "y1="; Int(Y1 * 1000000 + 0.5) / 1000000, "x2="; Int(X2 * 1000000 + 0.5) / 1000000, "y2="; Int(Y2 * 1000000 + 0.5) / 1000000, "x="; Int(x * 1000000 + 0.5) / 1000000, "y="; Int(y * 1000000 + 0.5) / 1000000
 
   e = Abs(y)
   MsgBox "按任意键继续"
   If e < 0.00001 Then
     Exit Do
   Else
      X1 = X2
      Y1 = Y2
      X2 = x
      Y2 = y
   End If
   k = k + 1
Loop
Print
Print Tab(9); "经过"; k; "次弦位后得到方程的解为："; "x="; Int(x * 1000000 + 0.5) / 1000000
End Sub