cppVizhinerCipher

#include <iostream>

char* vizhiner(char* str, const char* key, bool mode = true, int alphaLength = 26)
{
    char* origStr{ str };
    size_t keyLength{ strlen(key) };
    int keyPos{ 0 };
    while (*str)
    {
        //if (mode)
        //{
        //    *str++ = ('A' + (*str + *(key + keyPos)) % alphaLength);
        //}
        //else
        //{
        //    *str++ = ('A' + (*str + alphaLength - *(key + keyPos)) % alphaLength);
        //}
        *str++ = ('A' + (*str + (mode ? *(key + keyPos++) : alphaLength - *(key + keyPos++))) % alphaLength);
        //++keyPos;
        keyPos %= keyLength;
    }
    return origStr;
}


int main()
{

    //std::cout << char('A' + (('T' + 'E') % 26)) << '\n';
    //std::cout << char('A' + ('X' + 26 - 'E') % 26) << '\n';
    /*const int alphaLength{ 10 };

    for (int y{ 0 }; y < alphaLength; ++y)
    {
        for (int x{ 0 }; x < alphaLength; ++x)
        {
            std::cout << char('A' + ((y + x) % alphaLength)) << ' ';
        }
        std::cout << '\n';
    }*/
    char str[]{ "ATTACKATDAWN" };
    char key[]{ "LEMON" };
    std::cout << vizhiner(str, key) << '\n';
    std::cout << vizhiner(str, key, false) << '\n';

    return 0;
}