解一元二次方程.frm

解一元二次方程的算法

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "解一元二次方程"
   ClientHeight    =   1605
   ClientLeft      =   60
   ClientTop       =   450
   ClientWidth     =   2685
   LinkTopic       =   "Form1"
   ScaleHeight     =   1605
   ScaleWidth      =   2685
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton Command1 
      Caption         =   "计算"
      Height          =   735
      Left            =   1920
      TabIndex        =   10
      Top             =   600
      Width           =   495
   End
   Begin VB.TextBox Text5 
      Height          =   375
      Left            =   600
      TabIndex        =   9
      Text            =   "0"
      Top             =   1080
      Width           =   1095
   End
   Begin VB.TextBox Text4 
      Height          =   375
      Left            =   600
      TabIndex        =   6
      Text            =   "0"
      Top             =   510
      Width           =   1095
   End
   Begin VB.TextBox Text3 
      Height          =   285
      Left            =   1680
      TabIndex        =   4
      Text            =   "+1"
      Top             =   120
      Width           =   495
   End
   Begin VB.TextBox Text2 
      Height          =   285
      Left            =   960
      TabIndex        =   3
      Text            =   "+2"
      Top             =   120
      Width           =   495
   End
   Begin VB.TextBox Text1 
      Height          =   285
      Left            =   120
      TabIndex        =   1
      Text            =   "1"
      Top             =   120
      Width           =   495
   End
   Begin VB.Label Label5 
      AutoSize        =   -1  'True
      Caption         =   "x2="
      Height          =   195
      Left            =   120
      TabIndex        =   8
      Top             =   1080
      Width           =   255
   End
   Begin VB.Label Label4 
      AutoSize        =   -1  'True
      Caption         =   "x1="
      Height          =   195
      Left            =   120
      TabIndex        =   7
      Top             =   600
      Width           =   255
   End
   Begin VB.Label Label3 
      AutoSize        =   -1  'True
      Caption         =   "＝0"
      Height          =   195
      Left            =   2280
      TabIndex        =   5
      Top             =   165
      Width           =   270
   End
   Begin VB.Label Label2 
      AutoSize        =   -1  'True
      Caption         =   "x"
      Height          =   195
      Left            =   1560
      TabIndex        =   2
      Top             =   165
      Width           =   75
   End
   Begin VB.Label Label1 
      AutoSize        =   -1  'True
      Caption         =   "x*x"
      Height          =   195
      Left            =   720
      TabIndex        =   0
      Top             =   165
      Width           =   210
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False


Private Sub Command1_Click()
    Dim a#, b#, c#, X1#, X2#
    a = Text1.Text
    b = Text2.Text
    c = Text3.Text
    
    X1 = (-b + Sqr(b * b - 4 * a * c)) / (2 * a)
    X2 = (-b - Sqr(b * b - 4 * a * c)) / (2 * a)
    
    Text4.Text = X1
    Text5.Text = X2
End Sub