~~~Constructive Criticism~~~
This is the list of things that you could improve/change:
1. Please do not "fancy-format" the console using <conio.h>. In fact, please do not use <conio.h> when possible, as it varies hugely between compilers.
2. Please upgrade from Turbo C++ to something newer. There so much you're
probably missing out on. :/
3. Either prefix all your calls to cout and cin with std:: or put
using namespace std;
at the top each of your functions.
This is an error.
4. You might want to remove the redundant continue from your while loop in #6.
5. In #3, there is no standardized function random() or randomize() in <cstdlib>. Maybe Turbo C++ added it there. Use srand() and rand() instead, please. :)
6. C++ type casing is a lot richer than C-style casts. You might want to mention that?
Sorry, but you don't seem to be quite ready for teaching good C++ habits. This list
may did grow longer. :/
-Albatross
EDIT: Four digits that could be misread as the first three digits of pi posts, and counting (3114).