practice6_18.frm

来自「深圳大学的vb上机与教学的课件」· FRM 代码 · 共 102 行

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "用二分法求方程的根"
   ClientHeight    =   3195
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   4680
   LinkTopic       =   "Form1"
   ScaleHeight     =   3195
   ScaleWidth      =   4680
   StartUpPosition =   2  '屏幕中心
   Begin VB.Label Label3 
      BorderStyle     =   1  'Fixed Single
      Caption         =   "单击此处开始计算"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   15.75
         Charset         =   134
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      ForeColor       =   &H00C00000&
      Height          =   735
      Left            =   120
      TabIndex        =   3
      Top             =   1680
      Width           =   4455
   End
   Begin VB.OLE OLE1 
      BackStyle       =   0  'Transparent
      BorderStyle     =   0  'None
      Class           =   "Equation.3"
      Height          =   495
      Left            =   1560
      OleObjectBlob   =   "practice6_18.frx":0000
      SizeMode        =   1  'Stretch
      TabIndex        =   2
      Top             =   120
      Width           =   2055
   End
   Begin VB.Label Label1 
      AutoSize        =   -1  'True
      Caption         =   "求方程"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   15.75
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   315
      Left            =   600
      TabIndex        =   1
      Top             =   240
      Width           =   945
   End
   Begin VB.Label Label2 
      AutoSize        =   -1  'True
      Caption         =   "在区间（1，4）内的实根"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   15.75
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   315
      Left            =   600
      TabIndex        =   0
      Top             =   720
      Width           =   3480
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Sub Label3_Click()
  a = 1
  b = 4
  n = 0
  f1 = a ^ 3 + 4 * a ^ 2 - 10
  Do While b - a > 0.00001
    x = (a + b) / 2
    f = x ^ 3 + 4 * x ^ 2 - 10
    If f1 * f > 0 Then
      a = x
    Else
      b = x
    End If
  Loop
  Label3.Caption = "方程的根为：" & Format(x, "0.0000")
End Sub