C Program Dynamic Memory Allocation

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

// Dynamic Memory Allocation

//--------------------------------------------------------------------------

class student
{

 private:

 int rno ;
 char name [25] ;


 public:

 student ()
 {
  rno = 0 ;
  strcmp ( name , "N.A" ) ;
 }

 void getinfo ()
 {
  gotoxy ( 10 , 5 ) ;
  cout << "Enter Roll No .................... : " ;
  cin >> rno ;

  gotoxy ( 10 , 7 ) ;
  cout << "Enter Name ....................... : " ;
  gets ( name ) ;
 }

 void showinfo ( int row )
 {
  gotoxy ( 5 , row ) ;
  cout << rno ;

  gotoxy ( 25 , row ) ;
  cout << name ;
 }

};

//#define max 500

//-----------------------------------------------------------------------

void main ()
{

 clrscr () ;

 student *ptr ;

 char ch = 0 ;
 int counter = 0 ;

 while ( ch !='n' && ch !='N' )
 {
  clrscr () ;

  gotoxy ( 10 , 3 ) ;
  cout << "Record No : " << ( counter + 1 ) ;

  ptr = new student ;
  ptr -> getinfo () ;

  counter ++ ;
  ptr=ptr+1;
  gotoxy ( 10 , 23 ) ; cout << "Do you want to enter [Y/N] : " ;
  ch = getch () ;
 }

 clrscr () ;

 for ( int i = 0 ; i < counter ; i++ )
 {
  ptr -> showinfo ( 5 + i ) ;
  ptr =ptr-1 ;
 }

 getch () ;

}