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Steuerndes Programm-Fluß

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1.Conditional Operators

Wir können verschiedene Conditional Operators verwenden, um den VB Programmfluß zu steuern. Im Allgemeinen ähneln sie nur mathematischen Operatoren. Conditional Operators sind sehr leistungsfähige Werkzeuge und sie lassen das VB Programm Datenwerte vergleichen und dann entscheiden, welche Tätigkeit zum zu nehmen, ob man ein Programm durchführt oder das Programm und das etc. beendet. Diese Operatoren werden in folgender Tabelle gezeigt:

Operator	Meaning
=	Equal to
>	More than
<	Less Than
>=	More than and equal
<=	Less than and equal
<>	Not Equal to

2. Logical Operators

Zusätzlich zu den Conditional Operators gibt es einige logische Operatoren, die hinzufügten Energie dem VB Programm anbieten und diese werden in der Tabelle unten gezeigt:

Operator	Meaning
And	Both sides must be true
or	One side or other must be true
Xor	One side or other must be true but not both
Not	Negates truth

3.Using wenn ..... dann ..... sonst Aussagen mit Operatoren

Um den VB Programmfluß effektiv zu steuern, pflegen wir wenn… dann… sonst Aussage zusammen mit den Logical Operators und den Conditional Operators und das allgemeine Format für wenn… dann… sonst Aussage ist wie folgt:

If conditions Then

VB expressions

Else

VB expressions

End If

Das folgende Beispiel zeigt den Gebrauch wenn ..... dann ..... sonst Aussagen.

Private Sub OK_Click()

firstnum = Val(usernum1.Text)
secondnum = Val(usernum2.Text)
total = Val(sum.Text)
If total = firstnum + secondnum And Val(sum.Text) <> 0 Then
correct.Visible = True
wrong.Visible = False
Else
correct.Visible = False
wrong.Visible = True
End If

End Sub

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Schlüsselwörter: Steuerndes Programm-Fluß, Wärmeübertragungfluß, Druckabfallfluß, Flußstrahl, steuernde Definition, Flußdynamik, steuernder Saft, öffnung Fluß, Programmmanagement, Durchflußsysteme

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