vc里面怎么编写一些无用的垃圾代码又不影响程序运行

typedef int (*F)();

F g_f0, g_f1;

int fa()
{
    return g_f0();
}

int fb()
{
    return g_f1();
}

int fc()
{
    return 0;
}

int fd()
{
    g_f1 = fa;
    g_f0 = fc;

    return fb();
}

int fe()
{
    g_f0 = fb;
    g_f1 = fd;

    return fa();
}

int main()
{
    return fe();
}