[es] - vb 6 code -> c#.net i procesiranje <undefined value>

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vb 6 code -> c#.net i procesiranje <undefined value>

^{11.08.2005. u 17:39 - pre 227 meseci}

Imam slijedeci kod u VB 6.0:

Code:

Option Explicit

Dim CikTable() As Double

Private Sub generateCikTable(ByVal k As Long, ByVal s As Long,
ByVal beta As Double, theta As Double, ByVal AcWT As Double)
    'this function generates a Cik table so these are calculated only once in the program
    Dim currentK As Long
    Dim i As Long
    Dim x As Long
    Dim Uk As Double    'faster than calculating twice
    Dim CikSum As Double
    Dim thisCik As Double
'    Dim a() As Double

'    ReDim a(1 To 4, 1 To 2)
    If k < 0 Then
        MsgBox "Error in generateCikTable, k must be equal to or greater than 0."
        End
    End If
    ReDim CikTable(0 To k, 0 To k) 'matrix, but half of it will be empty
    For i = 0 To k
        For currentK = i To k
            If i = currentK Then
                If currentK = 0 Then
                    thisCik = 1
                Else
                    CikSum = 0
                    For x = 0 To i - 1
                        CikSum = CikSum + CikTable(x, currentK)
                    Next x
                    thisCik = 1 - CikSum
                End If
            Else
                Uk = calculateUi(s + currentK, s, beta, theta) * AcWT
                thisCik = (Uk * CikTable(i, currentK - 1)) / (Uk - calculateUi(s + i, s, beta, theta) * AcWT)
            End If
            CikTable(i, currentK) = thisCik
        Next currentK
    Next i
End Sub

Poziv ove procedure:

Code:

Call generateCikTable(B - s - 1, s, beta, theta, AcWT)

Ja sam napisao ovu proceduru u C#-u ovako:

Code:

private void generateCikTable(long k, long s, double beta,
double theta, double AcWT)
        {
            long currentK, i, x;
            double Uk = 0, CikSum, thisCik=0;

            this._cikTable = new double[k, k];

            if (k<0) return;

            for (i=0; i<k; i++)
            {
                for (currentK = i; currentK < k; currentK++)
                {
                    if (i == currentK)
                    {
                        if (currentK==0) {thisCik = 1;}
                        else
                        {
                            CikSum = 0;
                            for (x=0; x<i; x++)
                            {
                                CikSum = CikSum + _cikTable[x, currentK];
                            }
                            thisCik = 1-CikSum;
                        }
                    }
                    else
                    {
                        Uk = calculateUi(s + currentK, s, beta, theta) * AcWT;
                        thisCik = (Uk * _cikTable[i, currentK - 1]) / (Uk - calculateUi(s + i, s, beta, theta) * AcWT);
                    }
                    _cikTable[i, currentK] = thisCik;
                }
            }
        }

Podaci koje kreira u C# nisu identicni sa podacima procedure napisane u VB 6.
Obje ove procedure kreiraju matricu, recimo cikTable[80][80].

Kada uporedim podatke, u obje funkcije, podaci postaju razliciti nakon otprilike 13-tog reda -> cikTable[13][0]. Do tada su tu negdje, ali zanemarljive greske.

Interesuje me da nije nesto oko zaokruzivanja brojeva ili nisu isti double u VB 6.0 i u C#-u (ili nisam dobro ovo preveo)...

Drugo pitanje:

Kako da procesiram '<undefined value>', tj da provjerim da li postoji vrijednost. Kada provjeravam: if (obj!=null) ... kaze da nisam instancirao objekat. Objekat je tipa Hashtable.

Hvala!

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