020.frm

VB初级练习源码适合刚学习VB的人练习。。。。

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "Form1"
   ClientHeight    =   6060
   ClientLeft      =   60
   ClientTop       =   450
   ClientWidth     =   5565
   LinkTopic       =   "Form1"
   ScaleHeight     =   6060
   ScaleWidth      =   5565
   StartUpPosition =   3  '窗口缺省
   Begin VB.TextBox Text5 
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   26.25
         Charset         =   134
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      ForeColor       =   &H00FF0000&
      Height          =   855
      Left            =   1920
      TabIndex        =   10
      Top             =   4320
      Width           =   3135
   End
   Begin VB.TextBox Text4 
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   26.25
         Charset         =   134
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      ForeColor       =   &H00FF0000&
      Height          =   855
      Left            =   1920
      TabIndex        =   9
      Top             =   3240
      Width           =   3135
   End
   Begin VB.TextBox Text3 
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   26.25
         Charset         =   134
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   855
      Left            =   1920
      TabIndex        =   8
      Top             =   2160
      Width           =   3135
   End
   Begin VB.TextBox Text2 
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   26.25
         Charset         =   134
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   855
      Left            =   1920
      TabIndex        =   7
      Top             =   1080
      Width           =   3135
   End
   Begin VB.TextBox Text1 
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   26.25
         Charset         =   134
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   855
      Left            =   1920
      TabIndex        =   6
      Top             =   0
      Width           =   3135
   End
   Begin VB.CommandButton Command1 
      Caption         =   "计算"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   26.25
         Charset         =   134
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   600
      Left            =   1440
      TabIndex        =   5
      Top             =   5400
      Width           =   1935
   End
   Begin VB.Label Label5 
      Caption         =   "X2="
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   42
         Charset         =   134
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   735
      Left            =   120
      TabIndex        =   4
      Top             =   4320
      Width           =   1575
   End
   Begin VB.Label Label4 
      Caption         =   "X1="
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   42
         Charset         =   134
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   735
      Left            =   120
      TabIndex        =   3
      Top             =   3240
      Width           =   1575
   End
   Begin VB.Label Label3 
      Caption         =   "C="
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   42
         Charset         =   134
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   735
      Left            =   120
      TabIndex        =   2
      Top             =   2280
      Width           =   1575
   End
   Begin VB.Label Label2 
      Caption         =   "B="
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   42
         Charset         =   134
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   735
      Left            =   120
      TabIndex        =   1
      Top             =   1200
      Width           =   1575
   End
   Begin VB.Label Label1 
      Caption         =   "A="
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   42
         Charset         =   134
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   735
      Left            =   120
      TabIndex        =   0
      Top             =   0
      Width           =   1575
   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 As Integer, b As Integer, c As Integer, d, x1, x2
a = Text1.Text
b = Text2.Text
c = Text3.Text
d = b ^ 2 - 4 * a * c
If d >= 0 Then
x1 = (-b + d ^ 1 / 2) / 2 * a
x2 = (-b - d ^ 1 / 2) / 2 * a
Else
x1 = "无解"
x2 = "无解"
End If
Text4.Text = x1
Text5.Text = x2

End Sub