C_CPP/04_UDEF/MP/main_04_UDEF_e.cpp

// file main_04_UDEF_e.cpp
#include <iostream>
#include <algorithm>

const int bitsPerOctet = 8;

struct BinaryOctet {
public:
    bool evenParity;   // set to true if number of '1' in bitsAsDigits is even, false otherwise
    char bitsAsDigits[bitsPerOctet]{}; // bit values as chars
    BinaryOctet();
    BinaryOctet(int x);
    BinaryOctet(const BinaryOctet &) = default;
    BinaryOctet &operator=(int const &a);
    const BinaryOctet operator--(int);
};

BinaryOctet::BinaryOctet() {
    for (char &bitsAsDigit : bitsAsDigits) {
        bitsAsDigit = '0';
    }
    evenParity = true;
}

BinaryOctet::BinaryOctet(int x) {
        for (int i = 0; i <= bitsPerOctet - 1; i++) {
        int tmp = ((x >> i) & 1);
        bitsAsDigits[i] = (tmp == 1) ? '1' : '0';
    }
    //TODO: das sollte eigentlich nicht benötigt werden
    std::reverse(std::begin(bitsAsDigits), std::end(bitsAsDigits));

    //einsen zählen
    int i = 0;
    for (char c : bitsAsDigits) {
        if (c == '1') i++;
    }

    evenParity = i % 2 == 0;
}


bool operator!=(BinaryOctet a, BinaryOctet b) {
    if (a.evenParity != b.evenParity) return false;
    for (int i = 0; i < bitsPerOctet; ++i) {
        if (a.bitsAsDigits[i] != b.bitsAsDigits[i]) return false;
    }
    return true;
}

const BinaryOctet BinaryOctet::operator--(const int) {


    return *this;
}

BinaryOctet operator+(BinaryOctet a, BinaryOctet b) {
    BinaryOctet result;

    for (int i = 0; i < bitsPerOctet; ++i) {
        if (a.bitsAsDigits[i] == b.bitsAsDigits[i]) result.bitsAsDigits[i] = '0';
        else result.bitsAsDigits[i] = '1';
    }

    return result;
}

BinaryOctet operator+(BinaryOctet a, int b) {

}

BinaryOctet operator/(BinaryOctet a, BinaryOctet b) {

    return a;
}

BinaryOctet &BinaryOctet::operator=(int const &a) {
    std::string tmp = std::to_string(a);
    for (int i = 0; i >= tmp.length(); i++) {
        bitsAsDigits[i] = tmp[i];
    }
    return *this;
}

BinaryOctet doCalculation(BinaryOctet a, BinaryOctet b) {
    BinaryOctet result;

    for (; a != b; b--) {
        a = a + 1;
        a = a / b;
    }
    result = a + b;
    return result;
}

// for println();
std::string as_string(BinaryOctet a) {
    std::string result = "(";
    for (char c : a.bitsAsDigits) {
        result += c;
    }
    result += ")";
    return result;
}

// for std::cout
std::ostream &operator<<(std::ostream &os, const BinaryOctet &toBePrinted) {
    os << as_string(toBePrinted);
    return os;
}

int main(int argc, char **argv) {
    BinaryOctet a = 0b00001111;
    std::cout << a << std::endl;
    BinaryOctet b = 0b00000110;
    std::cout << b << std::endl;
    std::cout << new BinaryOctet(5) << std::endl;
    std::cout << a + b << std::endl;
    //println("result = ", doCalculation(a,b));
    std::cout << "result = " << doCalculation(a, b) << std::endl;
    return 0;
}