BigInteger.h

#ifndef BIG_INTEGER
#define BIG_INTEGER

#include "MyVector.h"

/*
 * The BigInteger class is used to represent integers larger than 2^31.
 * It manages to do this by storing one digit in each 'element' of the list. 
 * Do not edit this file. 
 * Make your own BigInteger.hpp file using MyVector.hpp as a syntax guide.
 */ 

class BigIntException: public exception
{
    public:
        virtual const char * what() const throw()
        {
            return "Enter a string only numeric characters!";
        }
};


class BigInteger
{
	private:
        //Backend for the BigInt Implementation
		MyVector<int> digit_vector;
		
        //Stores whether the BigInt represents a positive or negative number
        bool isNegative;

	public:
		// The Default Constructor instantiates an empty list, and defaults isNegative to false
		BigInteger();

		/* The string constructor builds a positive or negative BigInteger object from a string
		 * integer: A string representation of an integer. A valid input would look like this:
		 *   				"865000000000000000000001"
		 * throws: The above exception when an incorrect string is entered.
		 */
		BigInteger(std::string really_big_number);
	    
        // You can skip this one -- BigInteger has no dynamic members
        // BigInteger & operator=(BigInteger source);
        
        // You can skip this one -- BigInteger has no dynamic members
        // Copy constructor
        // BigInteger(BigInteger &source);
        
        // Outputs your current BigInt value by returning it as a std::string.
        std::string to_string();
};

BigInteger operator+(BigInteger &bi1, BigInteger &bi2);
    
BigInteger operator-(BigInteger &bi1, BigInteger &bi2);

#endif