For starters, I suggest using either C style I/O or C++ style I/O, but not both at the same time.

Consequently, I would rewrite myflush() and mypause() as:
Code:
void myflush(std::istream& in)
{
    in.clear();
    in.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
}

void mypause()
{
    std::cout << "Press [Enter] to continue . . .";
    myflush(std::cin);
    std::cin.get();
}
You would then only need to call mypause().