/**
 * vardec.c - An example of what can happen when you declare arrays whose
 *   sizes are defined at run-time.
 */

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

/**
 * Print an array
 */
void 
print_array (int a[], int len)
{
  int i;
  if (len == 0)
    printf ("{ }");
  else
    {
      printf ("{ %3d", a[0]);
      for (i = 1; i < len; i++)
        printf (", %3d", a[i]);
      printf (" }");
    }
} // print_array

int silly (int i)
{
  int j;
  int b1[i];
  int b2[i];

  for (j = 0; j < i; j++)
    {
      b1[j] = j*j;
      b2[j] = -3*j;
    } // for

  printf ("b1: ");
  print_array (b1, i);
  printf ("\n");

  printf ("b2: ");
  print_array (b2, i);
  printf ("\n");
} // silly

int
main ()
{
  int i = 0;
  int j = 0;

  for (i = 1; i < 10; i++)
    {
      int a1[i];
      int a2[i];
     
      for (j = 0; j < i; j++)
        {
          a1[j] = i*j;
          a2[j] = -j;
        }

      printf ("a1: ");
      print_array (a1, i);
      printf ("\n");

      printf ("a2: ");
      print_array (a2, i);
      printf ("\n");

      silly (i);
    } // for

  return EXIT_SUCCESS;
} // main ()