CBigInt004
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//file   CBigInt004.cpp
//date   01/31/2005
//author aou

#include <iostream>
using namespace std;

const int MAX_DIGITS = 50;
const int BASE       = 10;

class CBigInt
  {
  private:
    int  _base;
    char _sign;
    char _digits[MAX_DIGITS];
  //...
  public:
    CBigInt(void);//constructor/auto-initializer
    void display(void);
    void initialize(void);
    CBigInt(char s[]); //CBigInt bi("+12345");
    void input(void);

    //add(a, b, c);
    //add(a, b);
    //add(b);
    //CBigInt abs(void);
    //CBigInt pow(int expo);
    //...
  };

void main(void)
  {
  CBigInt a("667627001667627001667627001"), b, c;
  a.display();

  a.input();
  a.display();


  //cin >> a; a.input();
  //cin >> b;
  //cin >> c;
  //c = a + b; add(a, b, c);
  //cout << c; c.display();
  }


void CBigInt::input(void)
  {
  char s[MAX_DIGITS+2];
  cin >> s;

  initialize();
  /*
  if (s[0] == '-')
    _sign = '-';
  else
    _sign = '+';
  */
  _sign = '+';
  /*
  j = MAX_DIGITS-1
  for i = length(s)-1 to 0
    digits[j] = s[i]
    j--
    end for
  */
  int j = MAX_DIGITS-1;
  for (int i = strlen(s)-1; i>=0; i--)
    {
    _digits[j] = s[i];
    j--;
    }

  }


CBigInt::CBigInt(char s[])
  {
  initialize();
  /*
  if (s[0] == '-')
    _sign = '-';
  else
    _sign = '+';
  */
  _sign = '+';
  /*
  j = MAX_DIGITS-1
  for i = length(s)-1 to 0
    digits[j] = s[i]
    j--
    end for
  */
  int j = MAX_DIGITS-1;
  for (int i = strlen(s)-1; i>=0; i--)
    {
    _digits[j] = s[i];
    j--;
    }
  }


void CBigInt::display(void)
  {
  cout << _sign;
  for (int i=0; i<=MAX_DIGITS-1; i++)
    cout << _digits[i];

  cout << '[' << _base << "]\n";
  }


void CBigInt::initialize(void)
  {
  _base = BASE;
  _sign = '+';
  for (int i=0; i<=MAX_DIGITS-1; i++)
    _digits[i] = '0';
  }


CBigInt::CBigInt(void)
  {
  _base = BASE;
  _sign = '+';
  for (int i=0; i<=MAX_DIGITS-1; i++)
    _digits[i] = '0';
  }

/*
Output:
+00000000000000000000000667627001667627001667627001[10]
123
+00000000000000000000000000000000000000000000000123[10]
Press any key to continue
*/