#include "salib.h"

using namespace std;

const bool debug_print = true;

class bignum
{
  protected:
    SA<int> digits;
    int num_digs;
    bool isnegative;

    int getdigit(int pos)
    { if (pos >= num_digs || pos < 0)
        return 0;
      else
        return digits.get(pos); }

    void setdigit(int pos, int val)
    { if (val == 0 && pos >= num_digs)
        return;
      if (pos > num_digs)
      { for (int i = num_digs; i < pos; i += 1)
          digits.set(i, 0); }
      if (pos >= num_digs)
        num_digs = pos + 1;
      digits.set(pos, val); }

  public:
    bignum()
    { num_digs = 0;
      isnegative = false; }

    bignum(int N)
    { num_digs = 0;
      isnegative = false;
      if (N < 0)
      { isnegative = true;
        N = - N; }
      for (int i = 0; N != 0; i += 1)
      { setdigit(i, N % 10);
        N /= 10; } }

    void print()
    { if (debug_print)
        cout << "(";
      if (isnegative)
        cout << "-";
      cout << getdigit(num_digs - 1);
      for (int i = num_digs - 2; i >= 0; i -= 1)
      { if (debug_print) 
          cout << ",";                
        cout << getdigit(i); }
      if (debug_print)
        cout << ")"; }
};

int main()
{ bignum a, b(987654321), c(-2468), d(5);
  a.print();
  cout << "\n";
  b.print();
  cout << "\n";
  c.print();
  cout << "\n";
  d.print();
  cout << "\n"; }