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Tip of the Day
Language: VB6
Expertise: Intermediate
Apr 14, 2001

WEBINAR:

On-Demand

Application Security Testing: An Integral Part of DevOps


GetPrimeNumbers - Evaluate the first N prime numbers

' Returns an array with the first N prime numbers
'
' Note: you can easily convert this routine to VB4 and VB5 by
' returning the result array through an argument instead of
' the return value

Function GetPrimeNumbers(numberOfPrimes As Long) As Long()
    Dim found As Long
    Dim n As Long
    Dim i As Long
    
    If numberOfPrimes <= 0 Then Err.Raise 1002, , "Invalid argument"
    
    ' we know the size of the result in advance
    ReDim result(1 To numberOfPrimes) As Long
    
    ' "2" is the first prime number
    result(1) = 2: found = 1
    
    n = 1
    Do
        ' all other prime numbers are odd, so we can skip even numbers
        n = n + 2
        ' let's check if N is a prime number
        For i = 1 To found
            If (n Mod result(i)) = 0 Then Exit For
        Next
        If i > found Then
            ' no prime number < N is a divisor for N
            ' therefore N is prime
            found = found + 1
            result(found) = n
            If found = numberOfPrimes Then Exit Do
        End If
    Loop
    
    GetPrimeNumbers = result
End Function
Francesco Balena
 
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