Fibonacci using Dynamic Array

fibonnaci.cpp

#include <stdio.h>
#include <stdlib.h>

int main ()
{
   double *fib;
   int n, i;

   printf("How many periods would you like? ");
   scanf("%d", &n );

   fib = (double *) malloc ( n * sizeof(double) );

   if ( fib == NULL )
   {
      printf("Error\n");
      exit (-1);
   }

   for ( i = 0 ; i <= n ; i++ )
   {
      if ( i == 0 || i == 1 )
      {
         fib[i] = i;
      } 
      else 
      {
         fib[i] = fib[i-1] + fib[i-2];
      }
      
      printf("fibonacci[%02d] = %7.0f  ", i, *(fib + i) );
      
      //Break line after 4 elements per row
      if ( i % 3 == 2 ) 
      {
         printf("\n");
      }
   }

   printf("\n");
   printf("%.1lf", *(fib+n));
   
   return 0;
}