C++基础知识：C++ bitset

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56

#include <iostream>   //使用bitset需要include <bitset> #include <bitset>   using namespace std;   int main(){     //bitset 使用整数初始化bitset     bitset<3> bs(7);     //输出bs各个位的值     cout<<"bs[0] is "<<bs[0]<<endl;     cout<<"bs[1] is "<<bs[1]<<endl;     cout<<"bs[2] is "<<bs[2]<<endl;     //下面的语句会抛出outofindexexception     //cout<<"bs[3] is "<<bs[3]<<endl;       //使用字符串初始化bitset     //注意：使用string初始化时从右向左处理，如下初始化的各个位的值将是110，而非011     string strVal("011");     bitset<3> bs1(strVal);     //输出各位      cout<<"bs1[0] is "<<bs1[0]<<endl;     cout<<"bs1[1] is "<<bs1[1]<<endl;     cout<<"bs1[2] is "<<bs1[2]<<endl;     //cout输出时也是从右边向左边输出     cout<<bs1<<endl;       //bitset的方法     //any()方法如果有一位为1，则返回1     cout<<"bs1.any() = "<<bs1.any()<<endl;       //none()方法，如果有一个为1none则返回0，如果全为0则返回1     bitset<3> bsNone;     cout<<"bsNone.none() = " <<bsNone.none()<<endl;       //count()返回几个位为1     cout<<"bs1.count() = "<<bs1.count()<<endl;       //size()返回位数     cout<<"bs1.size() = "<<bs1.size()<<endl;       //test()返回某一位是否为1     //flip()诸位取反     bitset<3> bsFlip = bs1.flip();     cout<<"bsFlip = "<<bsFlip<<endl;     //flip(int)将某一位取反           //reset()方法将各个位的值都重置为0       //to_ulong     unsigned long val = bs1.to_ulong();       int j;     cin>>j; }