#ifndef _BIGINT
#define _BIGINT
#include <iostream>
using namespace std;

class BigInt {
   friend ostream & operator<<(ostream&, BigInt*);
   char *numb;
   int cmp(char*,char*);
   char *addBigInt (char*,char*);
   char *shiftLeft (char*,int);
   char *multiplyLine (char*,char);
   char *complement(char *,size_t);
 public:
   ~BigInt();
   bool sign;
   BigInt(char*);
   BigInt(int);
   char *value();
   BigInt *toBigInt(long long);
   BigInt *addBigInt (BigInt*);
   BigInt *multiplyBigInt (BigInt*);
   BigInt *subtractBigInt(BigInt*);
   BigInt *modBigInt(BigInt*);
   BigInt *divideBigInt(BigInt*);
   BigInt *divideByTen();
   bool lessThanBigInt(BigInt*);
   bool equalsBigInt(BigInt*);
   bool absoluteLessThanBigInt(BigInt*);
   int sizeOf();

   BigInt &operator*(BigInt &);
   BigInt &operator*(BigInt *);
   BigInt &operator/(BigInt &);
   BigInt &operator/(BigInt *);
   BigInt &operator+(BigInt &);
   BigInt &operator+(BigInt *);
   BigInt &operator-(BigInt &);
   BigInt &operator-(BigInt *);
   BigInt &operator%(BigInt &);
   BigInt &operator%(BigInt *);
   BigInt &operator=(BigInt &);
   bool operator<(BigInt &);
   bool operator<(BigInt *);
};

ostream & operator<<(ostream&, BigInt*);
ostream & operator<<(ostream&, BigInt&);
#endif