电力管道图片:帮帮VB.net初学者！！！

Module Module1

Sub Main()
Dim i, j, k, temp As Short
For i = 1 To 15
Console.Write(" ")
Next
Console.WriteLine("九-九表")
Console.WriteLine()
Console.Write("* ")
For i = 1 To 9
Console.Write(CStr(i) & " ")
Next
Console.WriteLine()
For i = 1 To 9
Console.Write(CStr(i) & " ")
For j = 1 To i
temp = i * j
If temp >= 10 Then
Console.Write(" " &_ CStr(temp))
Else
Console.Write(" " &_ CStr(temp))
End If
Next j
Console.WriteLine("")
Next i
Console.ReadLine()
End Sub

End Module
（一个“九-九表”）
这段程序中！！第一个For循环中i = 1 To 15这个是定义i这个循环变量的初值和终值，但它在整段程序中起什么作用啊？在运行后也没有感觉出什么