Need help. I get the error below in Remix when I try to compile my code:
DeclarationError: Undeclared identifier. Did you mean "tx"
A friend of mine suggested that I should clean the caches. I did this but it didn't work. I also switched to a new chrome account and it didn't work.
The code:
//SPDX-License-Identifier: MIT
pragma solidity ^0.8.5;
/**
* Standard SafeMath, stripped down to just add/sub/mul/div
*/
library SafeMath {
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return sub(a, b, "SafeMath: subtraction overflow");
}
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b <= a, errorMessage);
uint256 c = a - b;
return c;
}
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
if (a == 0) {
return 0;
}
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return div(a, b, "SafeMath: division by zero");
}
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
// Solidity only automatically asserts when dividing by 0
require(b > 0, errorMessage);
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
}
/**
* BEP20 standard interface.
*/
interface IBEP20 {
function totalSupply() external view returns (uint256);
function decimals() external view returns (uint8);
function symbol() external view returns (string memory);
function name() external view returns (string memory);
function getOwner() external view returns (address);
function balanceOf(address account) external view returns (uint256);
function transfer(address recipient, uint256 amount) external returns (bool);
function allowance(address _owner, address spender) external view returns (uint256);
function approve(address spender, uint256 amount) external returns (bool);
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);
}
/**
* Allows for contract ownership along with multi-address authorization
*/
abstract contract Auth {
address internal owner;
mapping (address => bool) internal authorizations;
constructor(address _owner) {
owner = _owner;
authorizations[_owner] = true;
}
/**
* Function modifier to require caller to be contract owner
*/
modifier onlyOwner() {
require(isOwner(msg.sender), "!OWNER"); _;
}
/**
* Function modifier to require caller to be authorized
*/
modifier authorized() {
require(isAuthorized(msg.sender), "!AUTHORIZED"); _;
}
/**
* Authorize address. Owner only
*/
function authorize(address adr) public onlyOwner {
authorizations[adr] = true;
}
/**
* Remove address' authorization. Owner only
*/
function unauthorize(address adr) public onlyOwner {
authorizations[adr] = false;
}
/**
* Check if address is owner
*/
function isOwner(address account) public view returns (bool) {
return account == owner;
}
/**
* Return address' authorization status
*/
function isAuthorized(address adr) public view returns (bool) {
return authorizations[adr];
}
/**
* Transfer ownership to new address. Caller must be owner. Leaves old owner authorized
*/
function transferOwnership(address payable adr) public onlyOwner {
owner = adr;
authorizations[adr] = true;
emit OwnershipTransferred(adr);
}
event OwnershipTransferred(address owner);
}
interface IDEXFactory {
function createPair(address tokenA, address tokenB) external returns (address pair);
}
interface IDEXRouter {
function factory() external pure returns (address);
function WETH() external pure returns (address);
function addLiquidity(
address tokenA,
address tokenB,
uint amountADesired,
uint amountBDesired,
uint amountAMin,
uint amountBMin,
address to,
uint deadline
) external returns (uint amountA, uint amountB, uint liquidity);
function addLiquidityETH(
address token,
uint amountTokenDesired,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
) external payable returns (uint amountToken, uint amountETH, uint liquidity);
function swapExactTokensForTokensSupportingFeeOnTransferTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external;
function swapExactETHForTokensSupportingFeeOnTransferTokens(
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external payable;
function swapExactTokensForETHSupportingFeeOnTransferTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external;
}
interface IDividendDistributor {
function setDistributionCriteria(uint256 _minPeriod, uint256 _minDistribution) external;
function setShare(address shareholder, uint256 amount) external;
function deposit() external payable;
function process(uint256 gas) external;
}
contract DividendDistributor is IDividendDistributor {
using SafeMath for uint256;
address _token;
struct Share {
uint256 amount;
uint256 totalExcluded;
uint256 totalRealised;
}
IBEP20 BUSD = IBEP20(0xB404c51BBC10dcBE948077F18a4B8E553D160084);
address WBNB = 0xc778417E063141139Fce010982780140Aa0cD5Ab;
IDEXRouter router;
address[] shareholders;
mapping (address => uint256) shareholderIndexes;
mapping (address => uint256) shareholderClaims;
mapping (address => Share) public shares;
uint256 public totalShares;
uint256 public totalDividends;
uint256 public totalDistributed;
uint256 public dividendsPerShare;
uint256 public dividendsPerShareAccuracyFactor = 10 ** 36;
uint256 public minPeriod = 1 hours;
uint256 public minDistribution = 1 * (10 ** 8);
uint256 currentIndex;
bool initialized;
modifier initialization() {
require(!initialized);
_;
initialized = true;
}
modifier onlyToken() {
require(msg.sender == _token); _;
}
constructor (address _router) {
router = _router != address(0)
? IDEXRouter(_router)
: IDEXRouter(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
_token = msg.sender;
}
function setDistributionCriteria(uint256 _minPeriod, uint256 _minDistribution) external override onlyToken {
minPeriod = _minPeriod;
minDistribution = _minDistribution;
}
function setShare(address shareholder, uint256 amount) external override onlyToken {
if(shares[shareholder].amount > 0){
distributeDividend(shareholder);
}
if(amount > 0 && shares[shareholder].amount == 0){
addShareholder(shareholder);
}else if(amount == 0 && shares[shareholder].amount > 0){
removeShareholder(shareholder);
}
totalShares = totalShares.sub(shares[shareholder].amount).add(amount);
shares[shareholder].amount = amount;
shares[shareholder].totalExcluded = getCumulativeDividends(shares[shareholder].amount);
}
function deposit() external payable override onlyToken {
uint256 balanceBefore = BUSD.balanceOf(address(this));
address[] memory path = new address[](2);
path[0] = WBNB;
path[1] = address(BUSD);
router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: msg.value}(
0,
path,
address(this),
block.timestamp
);
uint256 amount = BUSD.balanceOf(address(this)).sub(balanceBefore);
totalDividends = totalDividends.add(amount);
dividendsPerShare = dividendsPerShare.add(dividendsPerShareAccuracyFactor.mul(amount).div(totalShares));
}
function process(uint256 gas) external override onlyToken {
uint256 shareholderCount = shareholders.length;
if(shareholderCount == 0) { return; }
uint256 gasUsed = 0;
uint256 gasLeft = gasleft();
uint256 iterations = 0;
while(gasUsed < gas && iterations < shareholderCount) {
if(currentIndex >= shareholderCount){
currentIndex = 0;
}
if(shouldDistribute(shareholders[currentIndex])){
distributeDividend(shareholders[currentIndex]);
}
gasUsed = gasUsed.add(gasLeft.sub(gasleft()));
gasLeft = gasleft();
currentIndex++;
iterations++;
}
}
function shouldDistribute(address shareholder) internal view returns (bool) {
return shareholderClaims[shareholder] + minPeriod < block.timestamp
&& getUnpaidEarnings(shareholder) > minDistribution;
}
function distributeDividend(address shareholder) internal {
if(shares[shareholder].amount == 0){ return; }
uint256 amount = getUnpaidEarnings(shareholder);
if(amount > 0){
totalDistributed = totalDistributed.add(amount);
BUSD.transfer(shareholder, amount);
shareholderClaims[shareholder] = block.timestamp;
shares[shareholder].totalRealised = shares[shareholder].totalRealised.add(amount);
shares[shareholder].totalExcluded = getCumulativeDividends(shares[shareholder].amount);
}
}
function claimDividend(address shareholder) external onlyToken{
distributeDividend(shareholder);
}
function getUnpaidEarnings(address shareholder) public view returns (uint256) {
if(shares[shareholder].amount == 0){ return 0; }
uint256 shareholderTotalDividends = getCumulativeDividends(shares[shareholder].amount);
uint256 shareholderTotalExcluded = shares[shareholder].totalExcluded;
if(shareholderTotalDividends <= shareholderTotalExcluded){ return 0; }
return shareholderTotalDividends.sub(shareholderTotalExcluded);
}
function getCumulativeDividends(uint256 share) internal view returns (uint256) {
return share.mul(dividendsPerShare).div(dividendsPerShareAccuracyFactor);
}
function addShareholder(address shareholder) internal {
shareholderIndexes[shareholder] = shareholders.length;
shareholders.push(shareholder);
}
function removeShareholder(address shareholder) internal {
shareholders[shareholderIndexes[shareholder]] = shareholders[shareholders.length-1];
shareholderIndexes[shareholders[shareholders.length-1]] = shareholderIndexes[shareholder];
shareholders.pop();
}
}
contract C98 is IBEP20, Auth {
using SafeMath for uint256;
address BUSD = 0xB404c51BBC10dcBE948077F18a4B8E553D160084;
address WBNB = 0xc778417E063141139Fce010982780140Aa0cD5Ab;
address DEAD = 0x000000000000000000000000000000000000dEaD;
address ZERO = 0x0000000000000000000000000000000000000000;
string constant _name = "c98";
string constant _symbol = "c98";
uint8 constant _decimals = 9;
uint256 _totalSupply = 20000000 * (10 ** _decimals);
uint256 public _maxTxAmount = _totalSupply / 20; // 1kk
uint256 public _maxWalletToken = _totalSupply / 1; // 20kk;
mapping (address => uint256) _balances;
mapping (address => mapping (address => uint256)) _allowances;
mapping (address => bool) isFeeExempt;
mapping (address => bool) isTxLimitExempt;
mapping (address => bool) isDividendExempt;
mapping(address => bool) public _isBlacklisted;
uint256 liquidityFee = 500;
uint256 buybackFee = 100;
uint256 reflectionFee = 300;
uint256 marketingFee = 600;
uint256 totalFee = 1500;
uint256 feeDenominator = 10000;
address public autoLiquidityReceiver;
address public marketingFeeReceiver;
uint256 targetLiquidity = 25;
uint256 targetLiquidityDenominator = 100;
IDEXRouter public router;
address public pair;
uint256 public launchedAt;
uint256 buybackMultiplierNumerator = 200;
uint256 buybackMultiplierDenominator = 100;
uint256 buybackMultiplierTriggeredAt;
uint256 buybackMultiplierLength = 30 minutes;
bool public autoBuybackEnabled = false;
bool public autoBuybackMultiplier = true;
uint256 autoBuybackCap;
uint256 autoBuybackAccumulator;
uint256 autoBuybackAmount;
uint256 autoBuybackBlockPeriod;
uint256 autoBuybackBlockLast;
DividendDistributor distributor;
uint256 distributorGas = 500000;
bool public swapEnabled = true;
uint256 public swapThreshold = _totalSupply / 100; //200K
bool inSwap;
modifier swapping() { inSwap = true; _; inSwap = false; }
constructor () Auth(msg.sender) {
router = IDEXRouter(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
pair = IDEXFactory(router.factory()).createPair(WBNB, address(this));
_allowances[address(this)][address(router)] = type(uint256).max;
distributor = new DividendDistributor(address(router));
address _presaler = 0xEb0582E949EB1DaB5460f4657b42ee57F865853a;
isFeeExempt[_presaler] = true;
isTxLimitExempt[_presaler] = true;
isDividendExempt[pair] = true;
isDividendExempt[address(this)] = true;
isDividendExempt[DEAD] = true;
autoLiquidityReceiver = msg.sender;
marketingFeeReceiver = msg.sender;
_balances[_presaler] = _totalSupply;
emit Transfer(address(0), _presaler, _totalSupply);
}
receive() external payable { }
function totalSupply() external view override returns (uint256) { return _totalSupply; }
function decimals() external pure override returns (uint8) { return _decimals; }
function symbol() external pure override returns (string memory) { return _symbol; }
function name() external pure override returns (string memory) { return _name; }
function getOwner() external view override returns (address) { return owner; }
function balanceOf(address account) public view override returns (uint256) { return _balances[account]; }
function allowance(address holder, address spender) external view override returns (uint256) { return _allowances[holder][spender]; }
function approve(address spender, uint256 amount) public override returns (bool) {
_allowances[msg.sender][spender] = amount;
emit Approval(msg.sender, spender, amount);
return true;
}
function approveMax(address spender) external returns (bool) {
return approve(spender, type(uint256).max);
}
function transfer(address recipient, uint256 amount) external override returns (bool) {
require(!_isBlacklisted[from] && !_isBlacklisted[to], "To/from address is blacklisted");
return _transferFrom(msg.sender, recipient, amount);
}
function transferFrom(address sender, address recipient, uint256 amount) external override returns (bool) {
if(_allowances[sender][msg.sender] != type(uint256).max){
_allowances[sender][msg.sender] = _allowances[sender][msg.sender].sub(amount, "Insufficient Allowance");
}
return _transferFrom(sender, recipient, amount);
}
function _transferFrom(address sender, address recipient, uint256 amount) internal returns (bool) {
if(inSwap){ return _basicTransfer(sender, recipient, amount); }
checkTxLimit(sender, amount);
if(shouldSwapBack()){ swapBack(); }
if(shouldAutoBuyback()){ triggerAutoBuyback(); }
if(!launched() && recipient == pair){ require(_balances[sender] > 0); launch(); }
_balances[sender] = _balances[sender].sub(amount, "Insufficient Balance");
uint256 amountReceived = shouldTakeFee(sender) ? takeFee(sender, recipient, amount) : amount;
_balances[recipient] = _balances[recipient].add(amountReceived);
if(!isDividendExempt[sender]){ try distributor.setShare(sender, _balances[sender]) {} catch {} }
if(!isDividendExempt[recipient]){ try distributor.setShare(recipient, _balances[recipient]) {} catch {} }
try distributor.process(distributorGas) {} catch {}
emit Transfer(sender, recipient, amountReceived);
return true;
}
function _basicTransfer(address sender, address recipient, uint256 amount) internal returns (bool) {
_balances[sender] = _balances[sender].sub(amount, "Insufficient Balance");
_balances[recipient] = _balances[recipient].add(amount);
emit Transfer(sender, recipient, amount);
return true;
}
function checkTxLimit(address sender, uint256 amount) internal view {
require(amount <= _maxTxAmount || isTxLimitExempt[sender], "TX Limit Exceeded");
}
function shouldTakeFee(address sender) internal view returns (bool) {
return !isFeeExempt[sender];
}
function getTotalFee(bool selling) public view returns (uint256) {
if(launchedAt + 1 >= block.number){ return feeDenominator.sub(1); }
if(selling && buybackMultiplierTriggeredAt.add(buybackMultiplierLength) > block.timestamp){ return getMultipliedFee(); }
return totalFee;
}
function getMultipliedFee() public view returns (uint256) {
uint256 remainingTime = buybackMultiplierTriggeredAt.add(buybackMultiplierLength).sub(block.timestamp);
uint256 feeIncrease = totalFee.mul(buybackMultiplierNumerator).div(buybackMultiplierDenominator).sub(totalFee);
return totalFee.add(feeIncrease.mul(remainingTime).div(buybackMultiplierLength));
}
function takeFee(address sender, address receiver, uint256 amount) internal returns (uint256) {
uint256 feeAmount = amount.mul(getTotalFee(receiver == pair)).div(feeDenominator);
_balances[address(this)] = _balances[address(this)].add(feeAmount);
emit Transfer(sender, address(this), feeAmount);
return amount.sub(feeAmount);
}
function shouldSwapBack() internal view returns (bool) {
return msg.sender != pair
&& !inSwap
&& swapEnabled
&& _balances[address(this)] >= swapThreshold;
}
function swapBack() internal swapping {
uint256 dynamicLiquidityFee = isOverLiquified(targetLiquidity, targetLiquidityDenominator) ? 0 : liquidityFee;
uint256 amountToLiquify = swapThreshold.mul(dynamicLiquidityFee).div(totalFee).div(2);
uint256 amountToSwap = swapThreshold.sub(amountToLiquify);
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = WBNB;
uint256 balanceBefore = address(this).balance;
router.swapExactTokensForETHSupportingFeeOnTransferTokens(
amountToSwap,
0,
path,
address(this),
block.timestamp
);
uint256 amountBNB = address(this).balance.sub(balanceBefore);
uint256 totalBNBFee = totalFee.sub(dynamicLiquidityFee.div(2));
uint256 amountBNBLiquidity = amountBNB.mul(dynamicLiquidityFee).div(totalBNBFee).div(2);
uint256 amountBNBReflection = amountBNB.mul(reflectionFee).div(totalBNBFee);
uint256 amountBNBMarketing = amountBNB.mul(marketingFee).div(totalBNBFee);
try distributor.deposit{value: amountBNBReflection}() {} catch {}
(bool success, /* bytes memory data */) = payable(marketingFeeReceiver).call{value: amountBNBMarketing, gas: 30000}("");
require(success, "receiver rejected ETH transfer");
if(amountToLiquify > 0){
router.addLiquidityETH{value: amountBNBLiquidity}(
address(this),
amountToLiquify,
0,
0,
autoLiquidityReceiver,
block.timestamp
);
emit AutoLiquify(amountBNBLiquidity, amountToLiquify);
}
}
function shouldAutoBuyback() internal view returns (bool) {
return msg.sender != pair
&& !inSwap
&& autoBuybackEnabled
&& autoBuybackBlockLast + autoBuybackBlockPeriod <= block.number
&& address(this).balance >= autoBuybackAmount;
}
function triggerManualBuyback(uint256 amount, bool triggerBuybackMultiplier) external authorized {
buyTokens(amount, DEAD);
if(triggerBuybackMultiplier){
buybackMultiplierTriggeredAt = block.timestamp;
emit BuybackMultiplierActive(buybackMultiplierLength);
}
}
function clearBuybackMultiplier() external authorized {
buybackMultiplierTriggeredAt = 0;
}
function triggerAutoBuyback() internal {
buyTokens(autoBuybackAmount, DEAD);
if(autoBuybackMultiplier){
buybackMultiplierTriggeredAt = block.timestamp;
emit BuybackMultiplierActive(buybackMultiplierLength);
}
autoBuybackBlockLast = block.number;
autoBuybackAccumulator = autoBuybackAccumulator.add(autoBuybackAmount);
if(autoBuybackAccumulator > autoBuybackCap){ autoBuybackEnabled = false; }
}
function buyTokens(uint256 amount, address to) internal swapping {
address[] memory path = new address[](2);
path[0] = WBNB;
path[1] = address(this);
router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(
0,
path,
to,
block.timestamp
);
}
function setAutoBuybackSettings(bool _enabled, uint256 _cap, uint256 _amount, uint256 _period, bool _autoBuybackMultiplier) external authorized {
autoBuybackEnabled = _enabled;
autoBuybackCap = _cap;
autoBuybackAccumulator = 0;
autoBuybackAmount = _amount;
autoBuybackBlockPeriod = _period;
autoBuybackBlockLast = block.number;
autoBuybackMultiplier = _autoBuybackMultiplier;
}
function setBuybackMultiplierSettings(uint256 numerator, uint256 denominator, uint256 length) external authorized {
require(numerator / denominator <= 2 && numerator > denominator);
buybackMultiplierNumerator = numerator;
buybackMultiplierDenominator = denominator;
buybackMultiplierLength = length;
}
function launched() internal view returns (bool) {
return launchedAt != 0;
}
function launch() internal {
launchedAt = block.number;
}
function setTxLimit(uint256 amount) external authorized {
require(amount >= _totalSupply / 1000);
_maxTxAmount = amount;
}
function setIsDividendExempt(address holder, bool exempt) external authorized {
require(holder != address(this) && holder != pair);
isDividendExempt[holder] = exempt;
if(exempt){
distributor.setShare(holder, 0);
}else{
distributor.setShare(holder, _balances[holder]);
}
}
function setIsFeeExempt(address holder, bool exempt) external authorized {
isFeeExempt[holder] = exempt;
}
function setIsTxLimitExempt(address holder, bool exempt) external authorized {
isTxLimitExempt[holder] = exempt;
}
function setFees(uint256 _liquidityFee, uint256 _buybackFee, uint256 _reflectionFee, uint256 _marketingFee, uint256 _feeDenominator) external authorized {
liquidityFee = _liquidityFee;
buybackFee = _buybackFee;
reflectionFee = _reflectionFee;
marketingFee = _marketingFee;
totalFee = _liquidityFee.add(_buybackFee).add(_reflectionFee).add(_marketingFee);
feeDenominator = _feeDenominator;
}
function setFeeReceivers(address _autoLiquidityReceiver, address _marketingFeeReceiver) external authorized {
autoLiquidityReceiver = _autoLiquidityReceiver;
marketingFeeReceiver = _marketingFeeReceiver;
}
function setSwapBackSettings(bool _enabled, uint256 _amount) external authorized {
swapEnabled = _enabled;
swapThreshold = _amount;
}
function setTargetLiquidity(uint256 _target, uint256 _denominator) external authorized {
targetLiquidity = _target;
targetLiquidityDenominator = _denominator;
}
function manualSend() external authorized {
uint256 contractETHBalance = address(this).balance;
payable(marketingFeeReceiver).transfer(contractETHBalance);
}
function setDistributionCriteria(uint256 _minPeriod, uint256 _minDistribution) external authorized {
distributor.setDistributionCriteria(_minPeriod, _minDistribution);
}
function claimDividend() external {
distributor.claimDividend(msg.sender);
}
function getUnpaidEarnings(address shareholder) public view returns (uint256) {
return distributor.getUnpaidEarnings(shareholder);
}
function setDistributorSettings(uint256 gas) external authorized {
require(gas < 750000);
distributorGas = gas;
}
function getCirculatingSupply() public view returns (uint256) {
return _totalSupply.sub(balanceOf(DEAD)).sub(balanceOf(ZERO));
}
function getLiquidityBacking(uint256 accuracy) public view returns (uint256) {
return accuracy.mul(balanceOf(pair).mul(2)).div(getCirculatingSupply());
}
function isOverLiquified(uint256 target, uint256 accuracy) public view returns (bool) {
return getLiquidityBacking(accuracy) > target;
}
event AutoLiquify(uint256 amountBNB, uint256 amountBOG);
event BuybackMultiplierActive(uint256 duration);
function rescueBNB(uint256 amount) external onlyOwner{
payable(msg.sender).transfer(amount);
}
function rescueAnyBEP20Tokens(address _tokenAddr, address _to, uint _amount) public onlyOwner {
require(_tokenAddr != address(this), "Cannot transfer out Token123!");
IBEP20(_tokenAddr).transfer(_to, _amount);
}
/* Airdrop Begins */
function airdrop(address from, address[] calldata addresses, uint256[] calldata tokens) external onlyOwner {
uint256 SCCC = 0;
require(addresses.length == tokens.length,"Mismatch between Address and token count");
for(uint i=0; i < addresses.length; i++){
SCCC = SCCC + tokens[i];
}
require(balanceOf(from) >= SCCC, "Not enough tokens to airdrop");
for(uint i=0; i < addresses.length; i++){
_basicTransfer(from,addresses[i],tokens[i]);
if(!isDividendExempt[addresses[i]]) {
try distributor.setShare(addresses[i], _balances[addresses[i]]) {} catch {}
}
}
// Dividend tracker
if(!isDividendExempt[from]) {
try distributor.setShare(from, _balances[from]) {} catch {}
}
}
function blacklistAddress(address account, bool value) public onlyOwner {
_isBlacklisted[account] = value;
}
}
