素数.frm

在VB5环境下开发的VB程序集,窗体控件源代码.

VERSION 5.00
Begin VB.Form FRM5_4_4 
   BackColor       =   &H00FFC0C0&
   Caption         =   "5-4-4:判断一个正整数是否为素数"
   ClientHeight    =   4020
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   7050
   LinkTopic       =   "Form1"
   ScaleHeight     =   4020
   ScaleWidth      =   7050
   StartUpPosition =   3  '窗口缺省
   Begin VB.TextBox Text1 
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   15.75
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   435
      Left            =   3960
      TabIndex        =   3
      Top             =   2280
      Width           =   1455
   End
   Begin VB.CommandButton Command1 
      Caption         =   "判断"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   15
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   495
      Left            =   3000
      TabIndex        =   2
      Top             =   3120
      Width           =   1455
   End
   Begin VB.Label Label2 
      BackColor       =   &H000000FF&
      Caption         =   "请输入一个正整数:"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   18
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   495
      Left            =   360
      TabIndex        =   1
      Top             =   2280
      Width           =   3255
   End
   Begin VB.Label Label1 
      BackColor       =   &H0080FFFF&
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   18
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   1695
      Left            =   360
      TabIndex        =   0
      Top             =   240
      Width           =   6495
   End
End
Attribute VB_Name = "FRM5_4_4"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Sub Command1_Click()
Dim n As Integer
n = Text1
k = Int(Sqr(n))
i = 2
SWIT = 0
Do While i <= k And SWIT = 0
  If n Mod i = 0 Then
  SWIT = 1
  Else
  i = i + 1
  End If
Loop
If SWIT = 0 Then
MsgBox (Str(n) & "是一个素数!")
Else
MsgBox (Str(n) & "不是一个素数!")
End If
End Sub

Private Sub Form_Load()
FRM5_4_4.Show
Label1.Caption = "  只能被1和它本身整除的数称为素数,为了判别一个数n是不是素数,可以将n被2到根号n之间的所有整数除,如果都除不尽,则n就是素数,否则n是非素数."
Text1.SetFocus
End Sub