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Flusso di programma di controllo
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operatori 1.Conditional

Possiamo usare i vari operatori condizionali per controllare il flusso di programma di VB. Basicamente, assomigliano agli operatori matematici soltanto. Gli operatori condizionali sono attrezzi molto potenti e lasciano il programma di VB confrontare i valori di dati ed allora decidere che azione da prendere, se eseguire un programma o terminare il programma ed ecc. Questi operatori sono indicati in seguente tabella:

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



operatori 2.Logical

Oltre che gli operatori condizionali, ci sono alcuni operatori logici che offrono hanno aggiunto l'alimentazione al programma di VB e questi sono indicati in Tabella qui sotto:

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 If.....Then.....Else dichiarazione con gli operatori

Controllare efficacemente il flusso di programma di VB, useremo se… allora… altrimenti dichiarazione insieme agli operatori logici ed agli operatori condizionali e la disposizione generale per se… allora… altrimenti la dichiarazione č come segue:

If conditions Then

VB expressions

Else

VB expressions

End If



Il seguente esempio mostra l'uso di If.....Then.....Else dichiarazione.
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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Keywords: Controlling Program Flow, heat transfer flow, pressure drop flow, flow jet, controlling definition, flow dynamics, sap controlling, orifice flow, program management, flow systems


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