vb 打出倒三角效果 vb For i = 4 To 1 Step -1 为什么可以使行数倒着打啊？

vb 打出倒三角效果 vb For i = 4 To 1 Step -1 为什么可以使行数倒着打啊？

Option Explicit

Private Sub Command1_Click()
Dim r As Integer, p As Integer, cs As String
Dim i As Integer, j As Integer
r = 9 '要打印的行数
cs = "*" '要打印的字符

For i = 1 To r

For j = r - i To 1 Step -1
cs = cs & "**"
Next j

Print Space(i) & cs
cs = ""
Print
Next i

End Sub

你好！ 初值是4，终值是1，步长为负壹，循环变量取初值，每循环一次循环变量减1 如有疑问，请追问。