pragma solidity ^0.5.0;

    /**
     * @notes All the credits go to the fantastic OpenZeppelin project and its community, see https://github.com/OpenZeppelin/openzeppelin-solidity
     * This contract was generated and deployed using https://tokens.kawatta.com
     */

    /**
     * @title ERC20 interface
     * @dev see https://eips.ethereum.org/EIPS/eip-20
     */
    interface IERC20 {
        function transfer(address to, uint256 value) external returns (bool);

        function approve(address spender, uint256 value) external returns (bool);

        function transferFrom(address from, address to, uint256 value) external returns (bool);

        function totalSupply() external view returns (uint256);

        function balanceOf(address who) external view returns (uint256);

        function allowance(address owner, address spender) external view returns (uint256);

        event Transfer(address indexed from, address indexed to, uint256 value);

        event Approval(address indexed owner, address indexed spender, uint256 value);
    }

    /**
     * @title SafeMath
     * @dev Unsigned math operations with safety checks that revert on error.
     */
    library SafeMath {
        /**
         * @dev Subtracts two unsigned integers, reverts on overflow (i.e. if subtrahend is greater than minuend).
         */
        function sub(uint256 a, uint256 b) internal pure returns (uint256) {
            require(b <= a, "SafeMath: subtraction overflow");
            uint256 c = a - b;

            return c;
        }

        /**
         * @dev Adds two unsigned integers, reverts on overflow.
         */
        function add(uint256 a, uint256 b) internal pure returns (uint256) {
            uint256 c = a + b;
            require(c >= a, "SafeMath: addition overflow");

            return c;
        }
    }

    /**
     * @title Standard ERC20 token
     *
     * @dev Implementation of the basic standard token.
     * https://eips.ethereum.org/EIPS/eip-20
     * Originally based on code by FirstBlood:
     * https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
     *
     * This implementation emits additional Approval events, allowing applications to reconstruct the allowance status for
     * all accounts just by listening to said events. Note that this isn't required by the specification, and other
     * compliant implementations may not do it.
     */
    contract ERC20 is IERC20 {
        using SafeMath for uint256;

        mapping (address => uint256) private _balances;

        mapping (address => mapping (address => uint256)) private _allowances;

        uint256 private _totalSupply;

        /**
         * @dev Total number of tokens in existence.
         */
        function totalSupply() public view returns (uint256) {
            return _totalSupply;
        }

        /**
         * @dev Gets the balance of the specified address.
         * @param owner The address to query the balance of.
         * @return A uint256 representing the amount owned by the passed address.
         */
        function balanceOf(address owner) public view returns (uint256) {
            return _balances[owner];
        }

        /**
         * @dev Function to check the amount of tokens that 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 uint256 specifying the amount of tokens still available for the spender.
         */
        function allowance(address owner, address spender) public view returns (uint256) {
            return _allowances[owner][spender];
        }

        /**
         * @dev Transfer token to a specified address.
         * @param to The address to transfer to.
         * @param value The amount to be transferred.
         */
        function transfer(address to, uint256 value) public returns (bool) {
            _transfer(msg.sender, to, value);
            return true;
        }

        /**
         * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
         * Beware that changing an allowance with this method brings the risk that someone may use both the old
         * and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this
         * race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards:
         * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
         * @param spender The address which will spend the funds.
         * @param value The amount of tokens to be spent.
         */
        function approve(address spender, uint256 value) public returns (bool) {
            _approve(msg.sender, spender, value);
            return true;
        }

        /**
         * @dev Transfer tokens from one address to another.
         * Note that while this function emits an Approval event, this is not required as per the specification,
         * and other compliant implementations may not emit the event.
         * @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 uint256 the amount of tokens to be transferred
         */
        function transferFrom(address from, address to, uint256 value) public returns (bool) {
            _transfer(from, to, value);
            _approve(from, msg.sender, _allowances[from][msg.sender].sub(value));
            return true;
        }

        /**
         * @dev Increase the amount of tokens that an owner allowed to a spender.
         * approve should be called when _allowances[msg.sender][spender] == 0. To increment
         * allowed value is better to use this function to avoid 2 calls (and wait until
         * the first transaction is mined)
         * From MonolithDAO Token.sol
         * Emits an Approval event.
         * @param spender The address which will spend the funds.
         * @param addedValue The amount of tokens to increase the allowance by.
         */
        function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
            _approve(msg.sender, spender, _allowances[msg.sender][spender].add(addedValue));
            return true;
        }

        /**
         * @dev Decrease the amount of tokens that an owner allowed to a spender.
         * approve should be called when _allowances[msg.sender][spender] == 0. To decrement
         * allowed value is better to use this function to avoid 2 calls (and wait until
         * the first transaction is mined)
         * From MonolithDAO Token.sol
         * Emits an Approval event.
         * @param spender The address which will spend the funds.
         * @param subtractedValue The amount of tokens to decrease the allowance by.
         */
        function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
            _approve(msg.sender, spender, _allowances[msg.sender][spender].sub(subtractedValue));
            return true;
        }

        /**
         * @dev Transfer token for a specified addresses.
         * @param from The address to transfer from.
         * @param to The address to transfer to.
         * @param value The amount to be transferred.
         */
        function _transfer(address from, address to, uint256 value) internal {
            require(to != address(0), "ERC20: transfer to the zero address");

            _balances[from] = _balances[from].sub(value);
            _balances[to] = _balances[to].add(value);
            emit Transfer(from, to, value);
        }

        /**
         * @dev Internal function that mints an amount of the token and assigns it to
         * an account. This encapsulates the modification of balances such that the
         * proper events are emitted.
         * @param account The account that will receive the created tokens.
         * @param value The amount that will be created.
         */
        function _mint(address account, uint256 value) internal {
            require(account != address(0), "ERC20: mint to the zero address");

            _totalSupply = _totalSupply.add(value);
            _balances[account] = _balances[account].add(value);
            emit Transfer(address(0), account, value);
        }

        /**
         * @dev Internal function that burns an amount of the token of a given
         * account.
         * @param account The account whose tokens will be burnt.
         * @param value The amount that will be burnt.
         */
        function _burn(address account, uint256 value) internal {
            require(account != address(0), "ERC20: burn from the zero address");

            _totalSupply = _totalSupply.sub(value);
            _balances[account] = _balances[account].sub(value);
            emit Transfer(account, address(0), value);
        }

        /**
         * @dev Approve an address to spend another addresses' tokens.
         * @param owner The address that owns the tokens.
         * @param spender The address that will spend the tokens.
         * @param value The number of tokens that can be spent.
         */
        function _approve(address owner, address spender, uint256 value) internal {
            require(owner != address(0), "ERC20: approve from the zero address");
            require(spender != address(0), "ERC20: approve to the zero address");

            _allowances[owner][spender] = value;
            emit Approval(owner, spender, value);
        }

        /**
         * @dev Internal function that burns an amount of the token of a given
         * account, deducting from the sender's allowance for said account. Uses the
         * internal burn function.
         * Emits an Approval event (reflecting the reduced allowance).
         * @param account The account whose tokens will be burnt.
         * @param value The amount that will be burnt.
         */
        function _burnFrom(address account, uint256 value) internal {
            _burn(account, value);
            _approve(account, msg.sender, _allowances[account][msg.sender].sub(value));
        }
    }


    /**
     * @title Burnable Token
     * @dev Token that can be irreversibly burned (destroyed).
     */
    contract ERC20Burnable is ERC20 {
        /**
         * @dev Burns a specific amount of tokens.
         * @param value The amount of token to be burned.
         */
        function burn(uint256 value) public {
            _burn(msg.sender, value);
        }

        /**
         * @dev Burns a specific amount of tokens from the target address and decrements allowance.
         * @param from address The account whose tokens will be burned.
         * @param value uint256 The amount of token to be burned.
         */
        function burnFrom(address from, uint256 value) public {
            _burnFrom(from, value);
        }
    }


    /**
     * @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 private _owner;

        event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

        /**
         * @dev The Ownable constructor sets the original `owner` of the contract to the sender
         * account.
         */
        constructor () internal {
            _owner = msg.sender;
            emit OwnershipTransferred(address(0), _owner);
        }

        /**
         * @return the address of the owner.
         */
        function owner() public view returns (address) {
            return _owner;
        }

        /**
         * @dev Throws if called by any account other than the owner.
         */
        modifier onlyOwner() {
            require(isOwner(), "Ownable: caller is not the owner");
            _;
        }

        /**
         * @return true if `msg.sender` is the owner of the contract.
         */
        function isOwner() public view returns (bool) {
            return msg.sender == _owner;
        }

        /**
         * @dev Allows the current owner to relinquish control of the contract.
         * It will not be possible to call the functions with the `onlyOwner`
         * modifier anymore.
         * @notice Renouncing ownership will leave the contract without an owner,
         * thereby removing any functionality that is only available to the owner.
         */
        function renounceOwnership() public onlyOwner {
            emit OwnershipTransferred(_owner, address(0));
            _owner = address(0);
        }

        /**
         * @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 {
            _transferOwnership(newOwner);
        }

        /**
         * @dev Transfers control of the contract to a newOwner.
         * @param newOwner The address to transfer ownership to.
         */
        function _transferOwnership(address newOwner) internal {
            require(newOwner != address(0), "Ownable: new owner is the zero address");
            emit OwnershipTransferred(_owner, newOwner);
            _owner = newOwner;
        }
    }


    /**
     * @title Roles
     * @dev Library for managing addresses assigned to a Role.
     */
    library Roles {
        struct Role {
            mapping (address => bool) bearer;
        }

        /**
         * @dev Give an account access to this role.
         */
        function add(Role storage role, address account) internal {
            require(!has(role, account), "Roles: account already has role");
            role.bearer[account] = true;
        }

        /**
         * @dev Remove an account's access to this role.
         */
        function remove(Role storage role, address account) internal {
            require(has(role, account), "Roles: account does not have role");
            role.bearer[account] = false;
        }

        /**
         * @dev Check if an account has this role.
         * @return bool
         */
        function has(Role storage role, address account) internal view returns (bool) {
            require(account != address(0), "Roles: account is the zero address");
            return role.bearer[account];
        }
    }

    contract PauserRole {
        using Roles for Roles.Role;

        event PauserAdded(address indexed account);
        event PauserRemoved(address indexed account);

        Roles.Role private _pausers;

        constructor () internal {
            _addPauser(msg.sender);
        }

        modifier onlyPauser() {
            require(isPauser(msg.sender), "PauserRole: caller does not have the Pauser role");
            _;
        }

        function isPauser(address account) public view returns (bool) {
            return _pausers.has(account);
        }

        function addPauser(address account) public onlyPauser {
            _addPauser(account);
        }

        function renouncePauser() public {
            _removePauser(msg.sender);
        }

        function _addPauser(address account) internal {
            _pausers.add(account);
            emit PauserAdded(account);
        }

        function _removePauser(address account) internal {
            _pausers.remove(account);
            emit PauserRemoved(account);
        }
    }

    /**
     * @title Pausable
     * @dev Base contract which allows children to implement an emergency stop mechanism.
     */
    contract Pausable is PauserRole {
        event Paused(address account);
        event Unpaused(address account);

        bool private _paused;

        constructor () internal {
            _paused = false;
        }

        /**
         * @return True if the contract is paused, false otherwise.
         */
        function paused() public view returns (bool) {
            return _paused;
        }

        /**
         * @dev Modifier to make a function callable only when the contract is not paused.
         */
        modifier whenNotPaused() {
            require(!_paused, "Pausable: paused");
            _;
        }

        /**
         * @dev Modifier to make a function callable only when the contract is paused.
         */
        modifier whenPaused() {
            require(_paused, "Pausable: not paused");
            _;
        }

        /**
         * @dev Called by a pauser to pause, triggers stopped state.
         */
        function pause() public onlyPauser whenNotPaused {
            _paused = true;
            emit Paused(msg.sender);
        }

        /**
         * @dev Called by a pauser to unpause, returns to normal state.
         */
        function unpause() public onlyPauser whenPaused {
            _paused = false;
            emit Unpaused(msg.sender);
        }
    }

    /**
     * @title Pausable token
     * @dev ERC20 modified with pausable transfers.
     */
    contract ERC20Pausable is ERC20, Pausable {
        function transfer(address to, uint256 value) public whenNotPaused returns (bool) {
            return super.transfer(to, value);
        }

        function transferFrom(address from, address to, uint256 value) public whenNotPaused returns (bool) {
            return super.transferFrom(from, to, value);
        }

        function approve(address spender, uint256 value) public whenNotPaused returns (bool) {
            return super.approve(spender, value);
        }

        function increaseAllowance(address spender, uint addedValue) public whenNotPaused returns (bool) {
            return super.increaseAllowance(spender, addedValue);
        }

        function decreaseAllowance(address spender, uint subtractedValue) public whenNotPaused returns (bool) {
            return super.decreaseAllowance(spender, subtractedValue);
        }
    }


    /**
     * @title ERC20Detailed token
     * @dev The decimals are only for visualization purposes.
     * All the operations are done using the smallest and indivisible token unit,
     * just as on Ethereum all the operations are done in wei.
     */
    contract ERC20Detailed is IERC20 {
        string private _name;
        string private _symbol;
        uint8 private _decimals;

        constructor (string memory name, string memory symbol, uint8 decimals) public {
            _name = name;
            _symbol = symbol;
            _decimals = decimals;
        }

        /**
         * @return the name of the token.
         */
        function name() public view returns (string memory) {
            return _name;
        }

        /**
         * @return the symbol of the token.
         */
        function symbol() public view returns (string memory) {
            return _symbol;
        }

        /**
         * @return the number of decimals of the token.
         */
        function decimals() public view returns (uint8) {
            return _decimals;
        }
    }

    /**
     * @title ERC20 token contract of BCTOKEN
     */
    contract ERC20Token is ERC20, ERC20Detailed, Ownable, ERC20Burnable, ERC20Pausable {
      uint8 public constant DECIMALS = 2;
      uint256 public constant INITIAL_SUPPLY = 1000000000 * (10 ** uint256(DECIMALS));

      /**
        * @dev Constructor that gives msg.sender all of existing tokens.
        */
      constructor () public ERC20Detailed("BCTOKEN", "BCTOKEN", DECIMALS) {
          _mint(msg.sender, INITIAL_SUPPLY);
      }
    }