题型：综合题 题类：常考题 难易度：困难
浙江省杭州市建人高复2018-2019学年高三上学期信息技术12月月考试卷
如果要对两个十进制数进行异或运算，可以按以下步骤进行：
① 先将要进行异或运算的两个十进制数分别转换为二进制；
② 对两个二进制数按位进行异或运算；例：(101101)2⊕(111)2=(101010)2
③ 再把步骤②中的运算结果转换为十进制，该十进制数即为运算结果。
小明编写了一个VB程序来模拟上述运算过程，程序功能如下：在文本框Text1和Text2中分别输入要参加异或运算的十进制数，单击计算按钮Command1，程序对输入的两个数进行异或运算，并将运算结果显示在文本框Text3中，程序运行界面如图所示。
Private Sub Command1_Click()
Dim a As Integer, b As Integer, c As Integer
Dim a1 As String, b1 As String
Dim lena1 As Integer, lenb1 As Integer, i As Integer
Dim result As String
a = Val(Text1.Text)
b = Val(Text2.Text)
If a > b Then
c = a: a = b: b = c
End If
result = ""
a1 = DtoB(a): b1 = DtoB(b)
lena1 = Len(a1): lenb1 = Len(b1)
i = 1
Do While i <= lena1
If Mid(a1, lena1 - i + 1, 1) = Mid(b1, lenb1 - i + 1, 1) Then
result = "0" + result
Else
result = "1" + result
End If
i = i + 1
Loop
result =
Text3.Text = BtoD(result)
End Sub
Public Function DtoB(x As Integer) As String
Dim remainder As String
DtoB = ""
Do While x > 0
remainder = CStr(x Mod 2) ＇如：CStr(3 Mod 2)的值为"1"
DtoB = remainder + DtoB
Loop
End Function
Public Function BtoD(x As String) As Integer
Dim i As Integer
BtoD = 0
For i = 1 To Len(x)
BtoD =+ Val(Mid(x, i, 1))
Next i
End Function
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