【加试题】异或的数学符号为“⊕”,其运算法则相当于不带进位的二进制加法:0⊕0=0,1⊕0=1,0⊕1=1,1⊕1=0(即符号两侧数值相同时,计算结果为0;数值不同时为1)。
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。
(1)
通过以上关于异或运算的描述,可知10⊕6的结果是。
(2)
实现上述功能的VB程序如下。请在划线处填入合适的代码。
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
答案: 【1】12
【1】Mid(b1,1,lenbl-lenal)+result【2】x=x\2【3】BtoD*2