Collabora Office 23.05 帮助
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.
GoSub label[:]
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
如果程序遇到 Return 语句之前没有「GoSub」,Collabora Office Basic 会返回一个错误信息。使用「Exit Sub」或「Exit Function」能够保证程序在到达下一个 Return 语句之前离开子程序或者函数。
以下示例用于说明「GoSub」和「Return」的使用。通过将程序段执行两遍,计算由用户输入的两个数的平方根。
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