位运算

输入一个十进制整数,数据范围要求在0~65535(无符号短整型),要求将这个整数的二进制数的最后一位变成0(如果这个整数的最后一位已经是0,就不用变了)。

 1 #include<iostream>
 2 #include<iomanip>
 3 using namespace std;
 4 void f(unsigned short int m)
 5 {
 6     int i;
 7     int g[100]={0};
 8     int t=0;
 9     while(m!=0)
10     {
11         int x=m%2;
12         g[t++]=x;
13         m=m/2;
14     }
15     for(i=1;i<=16-t;i++)
16     cout<<0;
17     for(i=t-1;i>=0;i--)
18     cout<<g[i];
19     cout<<endl;
20 }
21 int main()
22 {
23     unsigned short int b,c;
24     cout<<"请输入b的值(c的初始值是1):";
25     cin>>b;
26     unsigned short int t=b;
27     c=1;
28     cout<<endl;
29     cout<<"b所占的字节数是:"<<sizeof(b)<<endl;
30     cout<<"c所占的字节数是:"<<sizeof(c)<<endl;
31     cout<<endl;
32     cout<<"b的初始二进制数:";
33     f(b);
34     cout<<"c的初始二进制数:";
35     f(c);
36     cout<<endl;
37     c=~c;
38     cout<<"c按位求反(c=~c)后的十进制数是:";
39     cout<<c<<endl;
40     cout<<"b此时的十进制数是:";
41     cout<<b<<endl;
42     cout<<endl;
43     cout<<"c按位求反后的二进制数:";
44     f(c);
45     cout<<endl<<"经过运算:c=c&b 以后:"<<endl;
46     cout<<endl;
47     cout<<"运算后的b二进制数";
48     b=c&b;
49     f(b);
50     cout<<endl;
51     cout<<"最终结果是:";
52     cout<<endl<<endl;
53     cout<<"c的十进制数是:"<<c<<endl;
54     cout<<"b的十进制数是:"<<b<<endl;
55     cout<<endl;
56     cout<<"运算前的b的十进制数是:"<<t<<endl;
57     cout<<"运算后的b的十进制数是:"<<b<<endl;
58     cout<<"运算前的b的二进制数是:";
59     f(t);
60     cout<<"运算后的b的二进制数是:";
61     f(b);
62     return 0;
63 }
View Code

 

posted @ 2013-08-17 17:18  狂盗一枝梅  阅读(183)  评论(0编辑  收藏  举报