recursive showing of alphabetic characters

//recursive showing of alphabetic characters
//programming by : Erfan Nasoori
//Emaile : ketn68@yahoo.com 
//Date of send : 2009/1/13

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

void f(char);

void main()
{
 char c;
 cout<<"Enter alphabetic character : ";
 cin>>c;
 while( (c<'a' || c>'z') && (c<'A' || c>'Z') )
 {
 	cout<<"Please enter alphabetic character : ";
   cin>>c;
 }
 f(c);
 getch();
}

/*void f(char c)           //if you active this one
{                          //characters will be shown inversely
 cout<<c<<' ';
 if(c=='a' || c=='A')
 	return;
 else
   f(c-1);
}*/

void f(char c)
{
 if(c=='a' || c=='A')
  cout<<c<<' ';
 else
 {
  f(c-1);
  cout<<c<<' ';
 }
}