form1.vb

来自「Visual Basic .NET程序设计教程源代码」· VB 代码 · 共 74 行

Imports System.Math
Public Class Form1
    Inherits System.Windows.Forms.Form
    Function SquareRoot(ByVal X As Double) As Double
        Select Case Sign(X)
            Case 1
                Return Sqrt(X)
            Case 0
                Return 0
            Case -1
                Return -1
        End Select
    End Function

#Region " Windows 窗体设计器生成的代码 "

    Public Sub New()
        MyBase.New()

        '该调用是 Windows 窗体设计器所必需的。
        InitializeComponent()

        '在 InitializeComponent() 调用之后添加任何初始化

    End Sub

    '窗体重写处置以清理组件列表。
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub

    'Windows 窗体设计器所必需的
    Private components As System.ComponentModel.IContainer

    '注意：以下过程是 Windows 窗体设计器所必需的
    '可以使用 Windows 窗体设计器修改此过程。
    '不要使用代码编辑器修改它。
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.ClientSize = New System.Drawing.Size(292, 273)
        Me.Name = "Form1"
        Me.Text = "Form1"

    End Sub

#End Region

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim Msg As String
        Dim SqrN As Short
        Dim N As Double
        N = InputBox("请输入要计算平方根的数：")
        Msg = N & "的平方根"
        SqrN = Sign(N)
        Select Case SqrN
            Case 0
                Msg = Msg & "是0"
            Case -1
                Msg = Msg & "是一个虚数"
            Case Else
                Msg = Msg & "是" & Sqrt(N)
        End Select
        MsgBox(Msg, , "")
    End Sub
End Class