計算機等級考試二級VB常用算法(3)：素數

2、實戰(zhàn)練習

1)        補充代碼（2002春二（7））

下列程序的功能是：查找四位正整數中的超級素數。超級素數的定義為：當一個素數從低位到高位依次去掉一位數后剩下的數仍然是素數，則此數為超級素數。如數2333、233、23、2均為素數，所以2333為超級素數。

                  Option Explicit

                  Private Sub Command1_Click()

                           Dim I As Integer, flg As Boolean

                     For I = 1001 To 9999 Step 2

                        Call sup_prime(I, flg)

                       If flg Then

                        Debug.Print I

                      End If

                   Next I

                 End Sub

                  Private Sub sup_prime(  （1）  , F As Boolean)

                             Dim p As Integer

                        F = True

                                    Do While N > 0

                                   If prime(N) Then

                                                       （2）

                               Else

                                                 （3）

                                 Exit Sub

                           End If

                      Loop

                  End Sub

                  Public Function prime(p As Integer) As Boolean

                                 Dim k As Integer

                                 If p = 1 Then

                                           Exit Function

                                   Else

                                             For k = 2 To Sqr(p)

                                          If p Mod k = 0 Then Exit Function

                                          Next k

                                              （4）

                          End If

                  End Function
2)        編程題（2004春上機試卷03）

         隨機生成15個兩位正整數，從中找出所有的素數，并記下它是第幾個數，再找出其中最大的素數，并給出它的位置。

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