对分区间法.frm

完整的数值模拟软件

VERSION 5.00
Begin VB.Form Form24 
   BackColor       =   &H00FFFFFF&
   Caption         =   "对分区间法"
   ClientHeight    =   8535
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   9255
   LinkTopic       =   "Form18"
   ScaleHeight     =   8535
   ScaleWidth      =   9255
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton Command1 
      Caption         =   "对分区间法"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   10.5
         Charset         =   134
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   615
      Left            =   2760
      TabIndex        =   0
      Top             =   480
      Width           =   2655
   End
End
Attribute VB_Name = "Form24"
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: Print: Print: Print
Do While True
   x = X1
   Y1 = x ^ 3 + x - 4
   x = X2
   Y2 = x ^ 3 + x - 4
   x = (X1 + X2) / 2
   y = x ^ 3 + x - 4
   Print Tab(8); "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
   If y * Y1 > 0 Then
      X1 = x
   Else
      X2 = x
   End If
  
   e = Abs(y)
   MsgBox "按任意键继续"
   If e < 0.00001 Then
     Exit Do
   End If
   k = k + 1
Loop
Print
Print Tab(8); "经过"; k; "次区间对分后得到方程的解为："; "x="; Int(x * 1000000 + 0.5) / 1000000
End Sub