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

依數值型表示式的值，跳換到程式碼中數個指定行中的其中一行。

Syntax:

On GoSub/GoTo syntax


On expression GoSub Label1[, Label2[, Label3[,...]]]
On expression GoTo Label1[, Label2[, Label3[,...]]]

Parameters:

expression: Any numeric expression between 0 and 255 that determines which of the lines the program branches to. If expression is 0, the statement is not executed. If expression is greater than 0, the program jumps to the label that has a position number that corresponds to the expression (1 = First label; 2 = Second label)

label: Target line according to GoTo or GoSub structure.

GoTo 或 GoSub 慣例有效。

Example:


Sub ExampleOnGosub
Dim iVar As Integer
Dim sVar As String
    iVar = 2
    sVar =""
    On iVar GoSub Sub1, Sub2
    On iVar GoTo Line1, Line2
    Exit Sub
Sub1:
    sVar =sVar &  " From Sub 1 to" :Return
Sub2:
    sVar =sVar &  " From Sub 2 to" :Return
Line1:
    sVar =sVar &  " Label 1" :GoTo Ende
Line2:
    sVar =sVar &  " Label 2"
Ende:
    MsgBox sVar,0,"On...GoSub"
End Sub

GoSub...Return Statement

GoTo Statement