输入一个四位正整数,编写程序将其逆序输出

第一个
Private Sub Form_Click()
Dim a As Integer
Dim b(3) As Integer
a = Val(InputBox("输入一个4位数"))
If a > 1000 And a < 10000 Then
For i = 3 To 0 Step -1
b(i) = a / 10 ^ i
a = a - b(i) * 10 ^ i
Next
Else
MsgBox "请输入一个四位数"
Exit Sub
End If
For i = 0 To 3
Print Format(b(i));
Next
End Sub

第二个
Private Sub Form_Click()
Dim a, b, c, d As Integer
c = Val(InputBox("开始数")) '开始数
d = Val(InputBox("结束数")) '结束数

If c > d Then t = c: c = d: d = t
For a = c To d
Sum = 0
For b = 1 To a / 2
If a Mod b = 0 Then Sum = Sum + b
Next b
If Sum = a Then Print Sum
Next a

End Sub

1-1000么就这样

第二个
Private Sub Form_Click()

For a = 1 To 1000
Sum = 0
For b = 1 To a / 2
If a Mod b = 0 Then Sum = Sum + b
Next b
If Sum =