BV024bitOperations

#include <iostream>

char* encodecode(char* str, char key)
{
    char* origStr{ str };

    while (*str)
    {
        *str ^= key;
        ++str;
    }

    return origStr;
}

int main()
{
    // 0xffff
    // hex system 0..9, a - 10 b - 11 c -12 d -13 e -14 f -15
    // ff -> f * 16 ^ 0 + f * 16 ^ 1 = 15 + 240 = 255
    //uint8_t byte{0x1a}; // 16^0 * a + 16^1 * 1 = 1 * 10 + 16 * 1 = 10 + 16 = 26
    //uint8_t byte{ 0b1111 }; // (1 * 2 ^ 0) + (1 * 2 ^ 1) + (1 * 2 ^ 2) + (1 * 2 ^ 3) = 1 * 1 + 1 * 2 + 1 * 4 + 1 * 8 = 15

    // ~ - bitwise NOT - unary op
    // << - bitwise shift left - binary op
    // >> - bitwise shift right - binary op
    // | - bitwise OR - binary op
    // & - bitwise AND - binary op
    // ^ - bitwise XOR - binary op

    // <<= a = a << 1 -> a <<= 1
    // >>= a = a >> 4 -> a >>= 4
    // |= a = a | b -> a |= b
    // &= a = a & 0b0101 -> a &= 0b0101
    // ^= a = a ^ 42 -> a ^= 42

    uint8_t byte{ 0b1010 }; // 0b00000000
    uint8_t mask{ 0b0110 };
    // 0b1010
    // 0b0110

    // 0b1100
    // 0b0110

    // 0b1010
    // 0b1010

    uint8_t res;
    res = byte ^ mask;

    uint16_t word{ 0 };
    uint16_t wRes;
    wRes = ~word;
    // ~


    //for (int i{ 0 }; i < 16; ++i)
    //{
    //  std::cout << +(uint16_t)(0b1000000000000000 >> i) << '\n';
    //}
    char message[] = "Hello crypted world :)";
    char symb{ 'Z' };

    std::cout << message << '\n';
    std::cout << encodecode(message, 'q') << '\n';
    std::cout << encodecode(message, 'r') << '\n';
    std::cout << encodecode(message, 'r') << '\n';
    std::cout << encodecode(message, 'q') << '\n';

    //char* cPtr{nullptr};
    //cPtr = &symb;
    //cPtr = &message[0];
    //cPtr = message

    //std::cout <<  (+res) << '\n';
    return 0;
}