#include <iostream>

using namespace std;

int main()
{
    union my_data
    {
        uint16_t a;
        struct
        {
           unsigned b1:1;
           unsigned b2:1;
           unsigned b3:6;
            
        };
    };
    my_data data;
    data.b3 = 20;
    data.b2 = 1;
    data.b1 = 1;
    
    cout<<data.a<<endl;
    
    return 0;
}

#include <iostream>

using namespace std;


class status_word
{
public:
    uint16_t data;

    status_word()
    {
        data=0x0000;
    }

    uint8_t get_int_3bit()
    {
        return data & 7;
    }

    uint8_t set_int_3bit(uint8_t a)
    {
        a &= 7;
        data &= 0xFFF8;
        data |= a;
    }

    bool get_bool1()
    {
        return data &(1<<3);
    }

    bool set_bool1(bool a)
    {
        data &= 0xFFF7;

        if(a) data |= 1<<3;
    }

    void print()
    {
        cout << "data=" << data << "  3_bit=" << (int)get_int_3bit() << " bool1=" << get_bool1() << endl;
    }

};

int main()
{
    status_word w;

    w.set_int_3bit(0x00f3);
    w.set_bool1(true);
    w.print();

    w.set_int_3bit(0x0001);
    w.set_bool1(false);
    w.print();

    return 0;
}