constructors.cpp

#pragma once

#include "../BigInt64.hpp"

BigInt64::BigInt64() {
	this->numArr = new std::vector<uint64_t>();
	this->numArr->push_back( 0 );
	this->positive = true;
	this->negative = false; // in the 2s complement system zero is repersented
							// as 0x0 with the sign bit being zero
}

BigInt64::BigInt64( const std::string &s ) {
	this->numArr = new std::vector<uint64_t>();
	std::string newS;
	if ( s[ 0 ] == '-' ) {
		this->negative = true;
		this->positive = false;
		newS           = s.substr( 1, s.length() - 1 );
	} else if ( s[ 0 ] == '+' ) {
		this->negative = false;
		this->positive = true;
		newS           = s.substr( 1, s.length() - 1 );
	} else {
		this->negative = false;
		this->positive = true;
		newS           = s;
	}

	BigInt num  = BigInt( newS );
	BigInt base = BigInt( "18446744073709551616" ); // 2**64

	while ( num > 0 ) {
		uint64_t remainder = ( uint64_t )( num % base ).to_long_long();
		this->numArr->push_back( remainder );
		num /= base;
	}
}

BigInt64::~BigInt64() {
	delete numArr;
}