How to detect special keys using c++

As we know, each character has a unique ASCII code, which can be used to detect it even if the character itself is not available on a standard keyboard. Similarly, my task is to detect special keys such as F1, F2, <--, -->,Shift+tab etc. when they are pressed, which in fact give an ASCII code of zero if we try it out. Is there any way? Please help me out here.

e.g. if F1 is pressed then perform required tasks...

Compiler:Borland C++ 5.0

Here's a poor attempt for you to ponder over. It takes the wild assumption that you are using a Windows console.

Code:

---

#include <iostream>
#include <conio.h>

using namespace std;

int main(void){       
       
        int pressedkey;
        int i = 0;
       
        cout << "Press any key." <<endl;
        while (1)
        {
                if ((pressedkey = getch()) != EOF)
                {
                        cout <<i++ <<" " <<hex <<pressedkey <<endl;
                }
        }
        return 0;
}

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