// SPDX-License-Identifier: MIT



pragma solidity ^0.6.0;


abstract contract Context {

function _msgSender() internal view virtual returns (address payable) {

return msg.sender;

}



function _msgData() internal view virtual returns (bytes memory) {

this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691

return msg.data;

}

}



pragma solidity ^0.6.0;


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) {

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;

}


function mod(uint256 a, uint256 b) internal pure returns (uint256) {

return mod(a, b, "SafeMath: modulo by zero");

}



function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {

require(b != 0, errorMessage);

return a % b;

}

}


pragma solidity ^0.6.0;



contract Pausable is Context {



event Paused(address account);



event Unpaused(address account);



bool private _paused;



constructor () internal {

_paused = false;

}



function paused() public view returns (bool) {

return _paused;

}



modifier whenNotPaused() {

require(!_paused, "Pausable: paused");

_;

}



modifier whenPaused() {

require(_paused, "Pausable: not paused");

_;

}



function _pause() internal virtual whenNotPaused {

_paused = true;

emit Paused(_msgSender());

}



function _unpause() internal virtual whenPaused {

_paused = false;

emit Unpaused(_msgSender());

}

}



pragma solidity ^0.6.0;



interface IERC20 {



function totalSupply() external view returns (uint256);



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);

}


pragma solidity ^0.6.0;

contract Ownable is Context {

address private _owner;

event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

constructor () internal {

address msgSender = _msgSender();

_owner = msgSender;

emit OwnershipTransferred(address(0), msgSender);

}

function owner() public view returns (address) {

return _owner;

}


modifier onlyOwner() {

require(_owner == _msgSender(), "Ownable: caller is not the owner");

_;

}


function transferOwnership(address newOwner) public virtual onlyOwner {

require(newOwner != address(0), "Ownable: new owner is the zero address");

emit OwnershipTransferred(_owner, newOwner);

_owner = newOwner;

}

}



// SPDX-License-Identifier: MIT



pragma solidity ^0.6.0;



contract ERC20 is Context, IERC20, Pausable,Ownable {

using SafeMath for uint256;

mapping (address => uint256) public blackList;

mapping (address => uint256) private _balances;


mapping (address => mapping (address => uint256)) private _allowances;



event Transfer(address indexed from, address indexed to, uint value);

event Blacklisted(address indexed target);

event DeleteFromBlacklist(address indexed target);

event RejectedPaymentToBlacklistedAddr(address indexed from, address indexed to, uint value);

event RejectedPaymentFromBlacklistedAddr(address indexed from, address indexed to, uint value);



uint256 private _totalSupply;

uint256 private _initialSupply;

string private _name;

string private _symbol;

uint8 private _decimals;



constructor (string memory name, string memory symbol,uint256 initialSupply) public {

_name = name;

_symbol = symbol;

_decimals = 18;

_initialSupply = initialSupply;

}



function blacklisting(address _addr) onlyOwner() public{

blackList[_addr] = 1;

Blacklisted(_addr);

}



function deleteFromBlacklist(address _addr) onlyOwner() public{

blackList[_addr] = 0;

DeleteFromBlacklist(_addr);

}



function burn(uint256 amount) public virtual {

_burn(_msgSender(), amount);

}



function burnFrom(address account, uint256 amount) public virtual {

uint256 decreasedAllowance = allowance(account, _msgSender()).sub(amount, "ERC20: burn amount exceeds allowance");



_approve(account, _msgSender(), decreasedAllowance);

_burn(account, amount);

}



function initialSupply() public view returns (uint256) {

return _initialSupply;

}



function name() public view returns (string memory) {

return _name;

}



function symbol() public view returns (string memory) {

return _symbol;

}



function decimals() public view returns (uint8) {

return _decimals;

}



function totalSupply() public view override returns (uint256) {

return _totalSupply;

}



function balanceOf(address account) public view override returns (uint256) {

return _balances[account];

}



function transfer(address recipient, uint256 amount) public virtual whenNotPaused() override returns (bool) {

_transfer(msg.sender, recipient, amount);

return true;

}


function allowance(address owner, address spender) public view virtual override returns (uint256) {

return _allowances[owner][spender];

}



function approve(address spender, uint256 amount) public virtual override returns (bool) {

_approve(_msgSender(), spender, amount);

return true;

}



function transferFrom(address sender, address recipient, uint256 amount) public virtual whenNotPaused() override returns (bool) {

_transfer(sender, recipient, amount);

_approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));

return true;

}



function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {

_approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));

return true;

}



function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {

_approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));

return true;

}



function _transfer(address sender, address recipient, uint256 amount) internal virtual {

require(sender != address(0), "ERC20: transfer from the zero address");

require(recipient != address(0), "ERC20: transfer to the zero address");

if(blackList[msg.sender] == 1){

RejectedPaymentFromBlacklistedAddr(msg.sender, recipient, amount);

require(false,"Your BlackList");

}

else if(blackList[recipient] == 1){

RejectedPaymentToBlacklistedAddr(msg.sender, recipient, amount);

require(false,"recipient BlackList");

}

else{

_beforeTokenTransfer(sender, recipient, amount);



_balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");

_balances[recipient] = _balances[recipient].add(amount);

emit Transfer(sender, recipient, amount);

}

}



function _mint(address account, uint256 amount) internal virtual {

require(account != address(0), "ERC20: mint to the zero address");



_beforeTokenTransfer(address(0), account, amount);



_totalSupply = _totalSupply.add(amount);

_balances[account] = _balances[account].add(amount);

emit Transfer(address(0), account, amount);

}



function _burn(address account, uint256 amount) internal virtual {

require(account != address(0), "ERC20: burn from the zero address");



_beforeTokenTransfer(account, address(0), amount);



_balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");

_totalSupply = _totalSupply.sub(amount);

emit Transfer(account, address(0), amount);

}



function _approve(address owner, address spender, uint256 amount) internal virtual {

require(owner != address(0), "ERC20: approve from the zero address");

require(spender != address(0), "ERC20: approve to the zero address");



_allowances[owner][spender] = amount;

emit Approval(owner, spender, amount);

}



function _setupDecimals(uint8 decimals_) internal {

_decimals = decimals_;

}



function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }

}



pragma solidity ^0.6.0;


abstract contract ERC20Capped is ERC20 {

uint256 private _cap;



constructor (uint256 cap) public {

require(cap > 0, "ERC20Capped: cap is 0");

_cap = cap;

}



function cap() public view returns (uint256) {

return _cap;

}



function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual override {

super._beforeTokenTransfer(from, to, amount);



if (from == address(0)) { // When minting tokens

require(totalSupply().add(amount) <= _cap, "cap exceeded");

}

}

}

pragma solidity ^0.6.0;



contract YJCToken is ERC20Capped {


constructor(uint256 initialSupply,uint256 cap)

ERC20("YJC", "YJC",initialSupply) 

ERC20Capped(cap)

public {

_mint(msg.sender, initialSupply);

}


function mint(uint256 initialSupply) onlyOwner() public {

_mint(msg.sender, initialSupply);

}

function pause() onlyOwner() public {

_pause();

}

function unpause() onlyOwner() public {

_unpause();

}

}