VB编程：数组中插入新的数组元素

VB编程：数组中插入新的数组元素

运行效果：

程序代码：

Dim a() As Long
Private Sub Form_Load()
    ReDim Preserve a(1 To 4)   'Preserve：当改变原有数组最末维的大小时，使用此关键字可以保持数组中原来的数据。
    'Dim i As Long, m As Long
    a(1) = 1: a(2) = 2: a(3) = 3: a(4) = 4
    For i = 1 To 4
        Text1.Text = Text1.Text & "a(" & CStr(i) & ")=" & CStr(a(i)) & "; "
    Next i
    i = 2
    Dim n As Long: n = 6
    ReDim Preserve a(1 To 5)
    For i = 2 To 5
        m = a(i)
        a(i) = n
        n = m
    Next i
    For i = 1 To 5
        Text2.Text = Text2.Text & "a(" & CStr(i) & ")=" & CStr(a(i)) & "; "
    Next i
End Sub

小结：

1、数组中插入新的元素，数组的大小被改变，此时需要使用动态数组，并对数组ReDim重定义

2、Preserve：当改变原有数组最末维的大小时，使用此关键字可以保持数组中原来的数据。