Fibonacci Series

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

main()
{
   const unsigned long limit=4294967295;
   unsigned long next=0;
   unsigned long last=1;
   long sum;

   clrscr();

   cout<<"\n\nThis program will print the Fibonacci series :\n\n ";
   while(next<limit/2)
   {
      cout<<last <<"   ";
      sum=next+last;
      next=last;
      last=sum;
   }
   getch();
}