GoSub...Return-udtryk

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# GoSub...Return Statement

Calls a subroutine that is indicated by a label inside a Sub or a Function. The statements following the label are executed until the next Return statement. Afterwards, the program continues with the statement that follows the GoSub statement.

### Syntaks:

    GoSub label[:]

### Parametre:

label: A line identifier indicating where to continue execution. The scope of a label in that of the routine it belongs to.

The GoSub statement calls a local subroutine indicated by a label from within a subroutine or a function. The name of the label must end with a colon (":").

      Sub/Function foo
          ' statements
          GoSub label
          ' statements
          Exit Sub/Function
      label:
          ' statements
          Return
      End Sub/Function

Hvis programmet møder en Return-sætning, der ikke er indledt med GoSub, returnerer LibreOffice Basic en fejlmeddelelse. Brug Exit Sub eller Exit Function for at sikre, at programmet forlader en Sub eller en Function, før det når næste Return-sætning.

Følgende eksempel demonstrerer brugen af GoSub og Return. Ved at udføre en programsektion to gange beregner programmet kvadratroden af to tal, som er indtastet af brugeren.

### Eksempel:

    Sub ExampleGoSub
    Dim iInputa As Single
    Dim iInputb As Single
    Dim iInputc As Single
        iInputa = Int(InputBox$("Indtast det første tal: ","Talindtastning"))
        iInputb = Int(InputBox$("Indtast det andet tal: ","Talindtastning"))
        iInputc=iInputa
        GoSub SquareRoot
        Print "Kvadratroden af";iInputa;" er";iInputc
        iInputc=iInputb
        GoSub SquareRoot
        Print "Kvadratroden af";iInputb;" er";iInputc
        Exit Sub
    SquareRoot:
        iInputc=sqr(iInputc)
        Return
    End Sub

Relaterede emner

GoTo Statement

On...GoSub Statement; On...GoTo Statement