[Dev-C++] alternative to getch() ?

Hello everyone.

Ive written the following function which overloads the insertion =
operator for a class for restricting the input of a string to digits =
only:


class mystring
{
 char *str;

 // ....
public:
 friend istream& operator >> (istream &is, mystring &rhs);

 // ...
};

istream& operator >> (istream &is, mystring &rhs)
{
 char buf[256];
 char ch;
 short len =3D 0;

 do
 {
  ch =3D getch();

  if(isdigit(ch))
  {
   cout << ch;
   buf[len++] =3D ch;=20
  }
 } while(ch!=3D13); // while not 'return'. =20

 buf[len] =3D '\0'; // terminate string;
 rhs.str =3D new char[len];
 strcpy(rhs.str, buf);

 return is;
}

This compiles and runs fine on my compilers, but when I compile it and =
run it on my college compiler (MSVC++) getch and cin/cout dont get =
along!

My question is - being as getch() is non ansi and it also uses different =
buffers than cin/cout - is there a way of writing a simular function =
without using getch? getch is good because it doesn't display inputted =
characters and doesn't wait for a return keystroke, but I dont know how =
to achieve the same thing using cin/cout.

Any ideas?

Thanks in advance=20

Chris