pragma solidity ^0.4.26;

/**
* @title SafeMath
* @dev Math operations with safety checks that throw on error
*/
library SafeMath {
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
if (a == 0) {
return 0;
}
uint256 c = a * b;
assert(c / a == b);
return c;
}

function div(uint256 a, uint256 b) internal pure returns (uint256) {
// assert(b > 0); // Solidity automatically throws when dividing by 0
uint256 c = a / b;
// assert(a == b * c a % b); // There is no case in which this doesn't hold
return c;
}

function sub(uint256 a, uint256 b) internal pure returns (uint256) {
assert(b <= a);
return a - b;
}

function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a b;
assert(c >= a);
return c;
}
}

/**
* @title Ownable
* @dev The Ownable contract has an owner address, and provides basic authorization control
* functions, this simplifies the implementation of "user permissions".
*/
contract Ownable {
address public owner;

/**
* @dev The Ownable constructor sets the original `owner` of the contract to the sender
* account.
*/
function Ownable() public {
owner = msg.sender;
}

/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(msg.sender == owner);
_;
}

/**
* @dev Allows the current owner to transfer control of the contract to a newOwner.
* @param newOwner The address to transfer ownership to.
*/
function transferOwnership(address newOwner) public onlyOwner {
if (newOwner != address(0)) {
owner = newOwner;
}
}

}

/**
* @title BEP20Basic
* @dev Simpler version of BEP20 interface
* @dev see https://github.com/ethereum/EIPs/issues/20
*/
contract BEP20Basic {
uint public _totalSupply;
function totalSupply() public constant returns (uint);
function balanceOf(address who) public constant returns (uint);
function transfer(address to, uint value) public;
event Transfer(address indexed from, address indexed to, uint value);
}

/**
* @title BEP20 interface
* @dev see https://github.com/ethereum/EIPs/issues/20
*/
contract BEP20 is BEP20Basic {
function allowance(address owner, address spender) public constant returns (uint);
function transferFrom(address from, address to, uint value) public;
function approve(address spender, uint value) public;
event Approval(address indexed owner, address indexed spender, uint value);
}

/**
* @title Basic token
* @dev Basic version of StandardToken, with no allowances.
*/
contract BasicToken is Ownable, BEP20Basic {
using SafeMath for uint;

mapping(address => uint) public balances;

// additional variables for use if transaction fees ever became necessary
uint public basisPointsRate = 0;
uint public maximumFee = 0;

/**
* @dev Fix for the BEP20 short address attack.
*/
modifier onlyPayloadSize(uint size) {
require(!(msg.data.length < size 4));
_;
}

/**
* @dev transfer token for a specified address
* @param _to The address to transfer to.
* @param _value The amount to be transferred.
*/
function transfer(address _to, uint _value) public onlyPayloadSize(2 * 32) {
uint fee = (_value.mul(basisPointsRate)).div(10000);
if (fee > maximumFee) {
fee = maximumFee;
}
uint sendAmount = _value.sub(fee);
balances[msg.sender] = balances[msg.sender].sub(_value);
balances[_to] = balances[_to].add(sendAmount);
if (fee > 0) {
balances[owner] = balances[owner].add(fee);
emit Transfer(msg.sender, owner, fee);
}
emit Transfer(msg.sender, _to, sendAmount);
}

/**
* @dev Gets the balance of the specified address.
* @param _owner The address to query the the balance of.
* @return An uint representing the amount owned by the passed address.
*/
function balanceOf(address _owner) public constant returns (uint balance) {
return balances[_owner];
}

}

/**
* @title Standard BEP20 token
*
* @dev Implementation of the basic standard token.
* @dev https://github.com/ethereum/EIPs/issues/20
* @dev Based oncode by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
*/
contract StandardToken is BasicToken, BEP20 {

mapping (address => mapping (address => uint)) public allowed;

uint public constant MAX_UINT = 2**256 - 1;

/**
* @dev Transfer tokens from one address to another
* @param _from address The address which you want to send tokens from
* @param _to address The address which you want to transfer to
* @param _value uint the amount of tokens to be transferred
*/
function transferFrom(address _from, address _to, uint _value) public onlyPayloadSize(3 * 32) {
var _allowance = allowed[_from][msg.sender];

// Check is not needed because sub(_allowance, _value) will already throw if this condition is not met
// if (_value > _allowance) throw;

uint fee = (_value.mul(basisPointsRate)).div(10000);
if (fee > maximumFee) {
fee = maximumFee;
}
if (_allowance < MAX_UINT) {
allowed[_from][msg.sender] = _allowance.sub(_value);
}
uint sendAmount = _value.sub(fee);
balances[_from] = balances[_from].sub(_value);
balances[_to] = balances[_to].add(sendAmount);
if (fee > 0) {
balances[owner] = balances[owner].add(fee);
emit Transfer(_from, owner, fee);
}
emit Transfer(_from, _to, sendAmount);
}

/**
* @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
* @param _spender The address which will spend the funds.
* @param _value The amount of tokens to be spent.
*/
function approve(address _spender, uint _value) public onlyPayloadSize(2 * 32) {

// To change the approve amount you first have to reduce the addresses`
// allowance to zero by calling `approve(_spender, 0)` if it is not
// already 0 to mitigate the race condition described here:
// https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
require(!((_value != 0) && (allowed[msg.sender][_spender] != 0)));

allowed[msg.sender][_spender] = _value;
emit Approval(msg.sender, _spender, _value);
}

/**
* @dev Function to check the amount of tokens than an owner allowed to a spender.
* @param _owner address The address which owns the funds.
* @param _spender address The address which will spend the funds.
* @return A uint specifying the amount of tokens still available for the spender.
*/
function allowance(address _owner, address _spender) public constant returns (uint remaining) {
return allowed[_owner][_spender];
}

}

contract NETZERO is StandardToken {

string public name;
string public symbol;
uint public decimals;

// The contract can be initialized with a number of tokens
// All the tokens are deposited to the owner address
//
// @param _balance Initial supply of the contract
// @param _name Token Name
// @param _symbol Token symbol
// @param _decimals Token decimals
function NETZERO(uint _initialSupply, string _name, string _symbol, uint _decimals) public {
_totalSupply = _initialSupply;
name = _name;
symbol = _symbol;
decimals = _decimals;
balances[owner] = _initialSupply;
}

function transfer(address _to, uint _value) public {
return super.transfer(_to, _value);
}

function transferFrom(address _from, address _to, uint _value) public {
return super.transferFrom(_from, _to, _value);
}


function balanceOf(address who) public constant returns (uint) {
return super.balanceOf(who);
}


function approve(address _spender, uint _value) public onlyPayloadSize(2 * 32) {
return super.approve(_spender, _value);
}


function allowance(address _owner, address _spender) public constant returns (uint remaining) {
return super.allowance(_owner, _spender);
}

function totalSupply() public constant returns (uint) {
return _totalSupply;
}

}