c++ bitset数组操作

以下是两个C++中使用bitset数组的例子：

1. 使用bitset数组输出二进制数

#include <iostream>
#include <bitset>
using namespace std;

int main() {
    const unsigned bit_num = 13;
    bitset<bit_num> b1(0xbeef);
    for (int i = bit_num - 1; i >= 0; --i) {
        cout << b1[i];
    }
    cout << endl;

    bitset<20> b2(0xbeff);
    for (int i = 20 - 1; i >= 0; --i) {
        cout << b2[i];
    }

    return 0;
}

2. 使用bitset数组从字符串中提取二进制数

#include <iostream>
#include <bitset>
using namespace std;

int main() {
    string bit_string = "1001001100";
    bitset<10> b1(bit_string); // b1 is 1001001100
    bitset<4> b2(bit_string,5, 4, '0', '1');
    for (int i = 4 - 1; i >= 0; --i) {
        cout << b2[i];
    }
    cout << endl;

    bitset<4> b3(bit_string, bit_string.length() - 4);
    for (int i = 4 - 1; i >= 0; --i) {
        cout << b3[i];
    }

    return 0;
}