dp, clay and elezzzark, you are coders

i'm learning c++ and want to know if there is a way to target all systems in one method when i want to write directly to the console

i wrote a windows program where I'm using

int main()
{
    // Create Screen Buffer
    wchar_t *screen = new wchar_t[nScreenWidth*nScreenHeight];
    HANDLE hConsole = CreateConsoleScreenBuffer(GENERIC_READ | GENERIC_WRITE, 0, NULL, CONSOLE_TEXTMODE_BUFFER, NULL);
    SetConsoleActiveScreenBuffer(hConsole);
    DWORD dwBytesWritten = 0;

...
    screen[nScreenWidth * nScreenHeight - 1] = '\0';
    SetConsoleTextAttribute(hConsole, 0xaa);
    WriteConsoleOutputCharacter(hConsole, screen, nScreenWidth * nScreenHeight, { 0,0 }, &dwBytesWritten);
    } 

it works fine. i have 2 questions, what do i do to do that in a way which will work on any system? is that even possible?