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Attribute VB_Name = "ModTask_02"
Option Explicit
Function IsPrime(nInput As Integer) As Boolean
Dim nLoop As Integer
For nLoop = 2 To Int(Sqr(nInput))
If nInput Mod nLoop = 0 Then
IsPrime = False
Exit Function
End If
Next nLoop
IsPrime = True
End Function
Function FindPeriodPrime(nInput As Integer) As Integer
Dim nTemp As Integer, nSubTemp As Integer, nLoop As Integer
FindPeriodPrime = 0
nTemp = 1
For nLoop = 1 To nInput - 1
nTemp = (10 * nTemp) Mod nInput
Next nLoop
nSubTemp = nTemp
Do
nTemp = (10 * nTemp) Mod nInput
FindPeriodPrime = FindPeriodPrime + 1
Loop While nSubTemp <> nTemp
End Function
Sub Task_02()
'' Credit: https://rosettacode.org/wiki/Long_primes#Java
Const nLongPrimeMaxCount As Integer = 5
Dim strMsg As String
Dim nLongPrimeLoopCnt As Integer
Dim nPrimeLoop As Integer
nLongPrimeLoopCnt = 0
nPrimeLoop = 7 '' First Long Prime Number
Do
If IsPrime(nPrimeLoop) Then
If FindPeriodPrime(nPrimeLoop) = nPrimeLoop - 1 Then
If strMsg <> "" Then
strMsg = strMsg & ", "
End If
strMsg = strMsg & nPrimeLoop
nLongPrimeLoopCnt = nLongPrimeLoopCnt + 1
End If
End If
nPrimeLoop = nPrimeLoop + 2
Loop While nLongPrimeLoopCnt < nLongPrimeMaxCount
strMsg = "First " & nLongPrimeMaxCount & " Long Primes are: " & strMsg
MsgBox strMsg, vbOKOnly, strMyTitle
End Sub
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