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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.

### Syntax:

    GoSub label[:]

### Parameters:

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

當 LibreOffice Basic 發現 Return 陳述式前面沒有 GoSub 陳述式時，將傳回錯誤訊息。使用 Exit Sub 或 Exit Function 以確保程式在執行到下一個 Return 陳述式之前結束子常式或函式。

以下示例用於說明 GoSub 和 Return 的用法。透過將程式段執行兩遍，計算由使用者輸入的兩個數的平方根。

### Example:

    Sub ExampleGoSub
    Dim iInputa As Single
    Dim iInputb As Single
    Dim iInputc As Single
        iInputa = Int(InputBox("Enter the first number:","NumberInput"))
        iInputb = Int(InputBox("Enter the second number:","NumberInput"))
        iInputc=iInputa
        GoSub SquareRoot
        Print "The square root of";iInputa;" is";iInputc
        iInputc=iInputb
        GoSub SquareRoot
        Print "The square root of";iInputb;" is";iInputc
        Exit Sub
    SquareRoot:
        iInputc=sqr(iInputc)
        Return
    End Sub

相關主題

GoTo Statement

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

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