拖三个textbox，一个button
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在窗体上双击button1，在自动生成的button1的Click事件中：
textbox2.text=val(textbox1.text)^2
textbox3.text=val(textbox1.text)^3
Public Function panduan(ByVal n As Integer) As Boolean
Dim res As Boolean = False
Dim a, b, c, d, temp1, temp2 As Integer
a = n \ 1000
b = (n \ 100) Mod 10
c = (n \ 10) Mod 10
d = n Mod 10
temp1 = Sqrt(n)
temp2 = Sqrt(a + b + c + d)
If temp1 * temp1 = n And temp2 * temp2 = (a + b + c + d) Then
res = True
End If
Return res
End Function
Private Sub Button7_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button7.Click
Dim str As String = "", temp As Integer = 0, sum As Integer = 0, x As Integer
For i = 1000 To 9999 Step 1
If panduan(i) Then
temp = i
Exit For
End If
Next
TextBox6.Text = temp
End Sub
VB的运算顺序是：先乘除、后加减，有括号的先算括号内，有负号的先算负号。
请你比较一下这个运算中x和y的值：
Dim n As Single = 4
Dim x As Single
Dim y As Single
x = n + 1
x = x / n
x = x - 1
x = Math.Sqrt(x)
y = Math.Sqrt((n + 1) / n - 1)
这样就会发现，你的代码中括号的位置错了。
正确的应该是： Math.Sqrt((n + 1) / n - 1)
