开多个bitset和bitset的基本使用

 1     #include<bits/stdc++.h>
 2     using namespace std;   
 3     int main(){
 4         //bitset 使用整数初始化bitset
 5 
 6 //申请三个bitset(长为10位)
 7         bitset<10> bs[3]; 
 8                 
 9                 //初始化第三个bitset(bitset默认所有位为0,可以用数字对其初始化:
10                 //数字的二进制形式与bitset的下标对应,二进制的中的低位对应于bitset下标中的地位,
11                     //例如20的二进制10100,则bitset[0 1 2 3 ...]=0 0 1 0 1 0 0 0...)
12         bs[2]=20;
13 //访问
14         //输出第三个bitset 0位置的布尔值。
15         cout<<"bs[2][0]  :"<<bs[2][0]<<endl;
16 //bitset间的按位与或
17         //输出第三个bitset 的全部位置的值
18         cout<<"bs[2] :"<<bs[2]<<endl;
19 
20         cout<<"before |"<<bs[0]<<endl;
21         bs[0]=bs[0]|bs[2];
22         cout<<"after  |"<<bs[0]<<endl;
23 
24         cout<<"before &"<<bs[0]<<endl;
25         bs[0]=bs[0]&bs[1];
26         cout<<"after  &"<<bs[0]<<endl;
27 
28         cout<<"before ~"<<bs[0]<<endl;
29         bs[0]=~bs[1]; 
30         cout<<"after  ~"<<bs[0]<<endl;
31 
32 
33 
34     //以下为转载。--------------------------- 
35 
36                 //使用字符串初始化bitset
37                 //注意:使用string初始化时从右向左处理,类似于字符串是书写体,如下初始化的各个位的值将是110,而非011
38                 // string bitval("001100001");
39                 // bitset<15> bs1(bitval);
40                 bitset<15> bs1(123);
41                 //输出各位    
42                 cout<<"bs1[0] is "<<bs1[0]<<endl;
43                 cout<<"bs1[1] is "<<bs1[1]<<endl;
44                 cout<<"bs1[2] is "<<bs1[2]<<endl;
45                 //cout输出时也是从右边向左边输出
46                 cout<<bs1<<endl;
47 
48                 
49                 //bitset的方法-----------------
50 
51                 //any()方法如果有一位为1,则返回1
52                 cout<<"bs1.any() = "<<bs1.any()<<endl;
53 
54                 //none()方法,如果有一个为1none则返回0,如果全为0则返回1
55                 bitset<3> bsNone;
56                 cout<<"bsNone.none() = " <<bsNone.none()<<endl;
57 
58                 //count()返回几个位为1
59                 cout<<"bs1.count() = "<<bs1.count()<<endl;
60 
61                 //size()返回位数
62                 cout<<"bs1.size() = "<<bs1.size()<<endl;
63       
64 
65                 //flip()返回按位取反后的bitset
66                 bitset<15> bs1Flip = bs1.flip();
67                 cout<<"bs1Flip = "<<bs1Flip<<endl;
68 
69                 //to_ulong 二进制转为十进制数。
70                 unsigned long val = bs1.to_ulong();
71                 cout<<val;
72 
73 
74         return 0;
75     }

 

 output:
bs[2][0]  :0
bs[2] :0000010100
before |0000000000
after  |0000010100
before &0000010100
after  &0000000000
before ~0000000000
after  ~1111111111
bs1[0] is 1
bs1[1] is 1
bs1[2] is 0
000000001111011
bs1.any() = 1
bsNone.none() = 1
bs1.count() = 6
bs1.size() = 15
bs1Flip = 111111110000100
32644[Finished in 1.2s]

posted @ 2017-02-23 21:26  TechIsOnlyTool  阅读(269)  评论(0编辑  收藏  举报