请问一下这段代码有什么问题啊？

你程序里上面定义的是LastX、LastY,结果后面引用的时候却成了Last X、Last Y,中间都多了个空格，明显前后不是一个变量嘛，能不出错嘛？

Option Explicit
Dim LastX As Integer
Dim LastY As Integer

Private Sub Form_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
LastX = X
LastY = Y
End Sub

Private Sub Form_MouseMove(Button As Integer, Shift As Integer, X As Single, Y As Single)
If Button = 1 Then
Line (LastX, LastY)-(X, Y)
End If
If Button = 2 Then
Circle (X, Y), 50
End If
LastX = X
LastY = Y
End Sub
last和x中有个空格去掉就能运行！