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 contract ERC20Basic    - function totalSupply()    - function balanceOf(address who)    - function transfer(address to, uint256 ...  contract BasicToken is ERC20Basic    - function totalSupply()    - function transfer(address _to, uint25 ...    - function balanceOf(address _owner)  contract ERC20 is ERC20Basic    - function allowance(address owner, add ...    - function transferFrom(address from, a ...    - function approve(address spender, uin ...  contract ReentrancyGuard  contract BurnableToken is BasicTok ...    - function burn(uint256 _value)    - function _burn(address _who, uint256 ... library SafeMath    - function safeMul(uint256 a, uint256 b ...    - function safeDiv(uint256 a, uint256 b ...    - function safeSub(uint256 a, uint256 b ...    - function safeAdd(uint256 a, uint256 b ...    - function max64(uint64 a, uint64 b)    - function min64(uint64 a, uint64 b)    - function max256(uint256 a, uint256 b)    - function min256(uint256 a, uint256 b)  contract StandardToken is ERC20, B ...    - function transferFrom(    - function approve(address _spender, ui ...    - function secureApprove (address _spen ...    - function allowance(    - function increaseApproval(    - function decreaseApproval(  contract StandardBurnableToken is ...    - function burnFrom(address _from, uint ...  contract BFCoin is StandardBurnabl ... *    - function setCrowdsale(address _crowds ...    - function tokenTransfer(address _recei ...

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/**
 *Submitted for verification at Etherscan.io on 2019-02-21
*/

pragma solidity ^0.4.23;

contract ERC20Basic {
  function totalSupply() public view returns (uint256);
  function balanceOf(address who) public view returns (uint256);
  function transfer(address to, uint256 value) public returns (bool);
  event Transfer(address indexed from, address indexed to, uint256 value);
}

contract BasicToken is ERC20Basic{
  using SafeMath for uint256;

  mapping(address => uint256) balances;

  uint256 totalSupply_;

  /**
  * @dev Total number of tokens in existence
  */
  function totalSupply() public view returns (uint256) {
    return totalSupply_;
  }

  /**
  * @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, uint256 _value) public  returns (bool) {
    require(_to != address(0));
    require(_value <= balances[msg.sender]);

    balances[msg.sender] = balances[msg.sender].safeSub(_value);
    balances[_to] = balances[_to].safeAdd(_value);
    emit Transfer(msg.sender, _to, _value);
    return true;
  }

  /**
  * @dev Gets the balance of the specified address.
  * @param _owner The address to query the the balance of.
  * @return An uint256 representing the amount owned by the passed address.
  */
  function balanceOf(address _owner) public view returns (uint256) {
    return balances[_owner];
  }

}

contract ERC20 is ERC20Basic {
  function allowance(address owner, address spender)
    public view returns (uint256);

  function transferFrom(address from, address to, uint256 value)
    public returns (bool);

  function approve(address spender, uint256 value) public returns (bool);
  event Approval(
    address indexed owner,
    address indexed spender,
    uint256 value
  );
}

contract ReentrancyGuard {

  /// @dev counter to allow mutex lock with only one SSTORE operation
  uint256 private guardCounter = 1;

  /**
   * @dev Prevents a contract from calling itself, directly or indirectly.
   * If you mark a function `nonReentrant`, you should also
   * mark it `external`. Calling one `nonReentrant` function from
   * another is not supported. Instead, you can implement a
   * `private` function doing the actual work, and an `external`
   * wrapper marked as `nonReentrant`.
   */
  modifier nonReentrant() {
    guardCounter += 1;
    uint256 localCounter = guardCounter;
    _;
    require(localCounter == guardCounter);
  }

}

contract BurnableToken is BasicToken,ReentrancyGuard {

  event Burn(address indexed burner, uint256 value);

  /**
   * @dev Burns a specific amount of tokens.
   * @param _value The amount of token to be burned.
   */
  function burn(uint256 _value) public nonReentrant{
    _burn(msg.sender, _value);
  }

  function _burn(address _who, uint256 _value) internal {
    require(_value <= balances[_who]);
    // no need to require value <= totalSupply, since that would imply the
    // sender's balance is greater than the totalSupply, which *should* be an assertion failure

    balances[_who] = balances[_who].safeSub(_value);
    totalSupply_ = totalSupply_.safeSub(_value);
    emit Burn(_who, _value);
    emit Transfer(_who, address(0), _value);
  }
}

library SafeMath {
  function safeMul(uint256 a, uint256 b) internal pure returns (uint256) {
    uint c = a * b;
    assert(a == 0 || c / a == b);
    return c;
  }

  function safeDiv(uint256 a, uint256 b) internal pure returns (uint256) {
    assert(b > 0);
    uint c = a / b;
    assert(a == b * c + a % b);
    return c;
  }

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

  function safeAdd(uint256 a, uint256 b) internal pure returns (uint256) {
    uint c = a + b;
    assert(c>=a && c>=b);
    return c;
  }

  function max64(uint64 a, uint64 b) internal pure returns (uint64) {
    return a >= b ? a : b;
  }

  function min64(uint64 a, uint64 b) internal pure returns (uint64) {
    return a < b ? a : b;
  }

  function max256(uint256 a, uint256 b) internal pure returns (uint256) {
    return a >= b ? a : b;
  }

  function min256(uint256 a, uint256 b) internal pure returns (uint256) {
    return a < b ? a : b;
  }

}

contract StandardToken is ERC20, BasicToken, ReentrancyGuard {

  mapping (address => mapping (address => uint256)) internal allowed;


  /**
   * @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 uint256 the amount of tokens to be transferred
   */
  function transferFrom(
    address _from,
    address _to,
    uint256 _value
  )
    public nonReentrant
    returns (bool)
  {
    require(_to != address(0));
    require(_value <= balances[_from]);
    require(_value <= allowed[_from][msg.sender]);

    balances[_from] = balances[_from].safeSub(_value);
    balances[_to] = balances[_to].safeAdd(_value);
    allowed[_from][msg.sender] = allowed[_from][msg.sender].safeSub(_value);
    emit Transfer(_from, _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) {
    allowed[msg.sender][_spender] = _value;
    emit Approval(msg.sender, _spender, _value);
    return true;
  }
  /**
   * Change how many tokens given spender is allowed to transfer from message
   * spender.  In order to prevent double spending of allowance, this method
   * receives assumed current allowance value as an argument.  If actual
   * allowance differs from an assumed one, this method just returns false.
   *
   * @param _spender address to allow the owner of to transfer tokens from
   *        message sender
   * @param _currentValue assumed number of tokens currently allowed to be
   *        transferred
   * @param _newValue number of tokens to allow to transfer
   * @return true if token transfer was successfully approved, false otherwise
   * 
   * using secureApprove function instead of using standard approve function to prevent the double spending issue
   */
  function secureApprove (address _spender, uint256 _currentValue, uint256 _newValue)
   public nonReentrant returns (bool success) {
    if (allowance (msg.sender, _spender) == _currentValue)
      return approve (_spender, _newValue);
    else return false;
  }
  
  /**
   * @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 allowed[_owner][_spender];
  }

  /**
   * @dev Increase the amount of tokens that an owner allowed to a spender.
   * approve should be called when allowed[_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
   * @param _spender The address which will spend the funds.
   * @param _addedValue The amount of tokens to increase the allowance by.
   */
  function increaseApproval(
    address _spender,
    uint256 _addedValue
  )
    public nonReentrant
    returns (bool)
  {
    allowed[msg.sender][_spender] = (
      allowed[msg.sender][_spender].safeAdd(_addedValue));
    emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

  /**
   * @dev Decrease the amount of tokens that an owner allowed to a spender.
   * approve should be called when allowed[_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
   * @param _spender The address which will spend the funds.
   * @param _subtractedValue The amount of tokens to decrease the allowance by.
   */
  function decreaseApproval(
    address _spender,
    uint256 _subtractedValue
  )
    public nonReentrant
    returns (bool)
  {
    uint256 oldValue = allowed[msg.sender][_spender];
    if (_subtractedValue > oldValue) {
      allowed[msg.sender][_spender] = 0;
    } else {
      allowed[msg.sender][_spender] = oldValue.safeSub(_subtractedValue);
    }
    emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

}

contract StandardBurnableToken is BurnableToken, StandardToken {

  /**
   * @dev Burns a specific amount of tokens from the target address and decrements allowance
   * @param _from address The address which you want to send tokens from
   * @param _value uint256 The amount of token to be burned
   */
  function burnFrom(address _from, uint256 _value) public {
    require(_value <= allowed[_from][msg.sender]);
    // Should https://github.com/OpenZeppelin/zeppelin-solidity/issues/707 be accepted,
    // this function needs to emit an event with the updated approval.
    allowed[_from][msg.sender] = allowed[_from][msg.sender].safeSub(_value);
    _burn(_from, _value);
  }
}

contract BFCoin is StandardBurnableToken {

    string public constant name = "Betform Coin";
    string public constant symbol = "BFC";
    uint8 public constant decimals = 0;
    uint256 public constant INITIAL_SUPPLY = 240000000;
    address public crowdsaleAddress;
    address public owner;

    //function BFCoin() public {
    constructor() public {    
        totalSupply_ = INITIAL_SUPPLY;
        balances[msg.sender] = INITIAL_SUPPLY;
        owner=msg.sender;
    }
    
   modifier onlyCrowdsale {
      require(msg.sender == crowdsaleAddress);
      _;
   }
   modifier onlyOwner {
      require(msg.sender == owner);
      _;
   }
   
   function setCrowdsale(address _crowdsaleAddress) public onlyOwner {
      require(_crowdsaleAddress != address(0));
      crowdsaleAddress = _crowdsaleAddress;
   }
   
    function tokenTransfer(address _receiver, uint256 _amount) public onlyCrowdsale {
      require(_receiver != address(0));
      require(_amount > 0);
      transferFrom(owner,_receiver, _amount);
   }
   
}

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