contract MyAdvancedToken is developed, TokenERC20 {

	uint256 public sellPrice;
	uint256 public buyPrice;

	mapping (address => bool) public frozenAccount;

	/* This generates a public event on the blockchain that will notify clients */
	event FrozenFunds(address target, bool frozen);

	/* Initializes contract with initial supply tokens to the creator of the contract */
	constructor (
		uint256 initialSupply,
		string tokenName,
		string tokenSymbol
	) TokenERC20(initialSupply, tokenName, tokenSymbol) public {}

	/* Internal transfer, only can be called by this contract */
	function _transfer(address _from, address _to, uint _value) internal {
		require (_to != 0x0);                               // Prevent transfer to 0x0 address. Use burn() instead
		require (balanceOf[_from] >= _value);               // Check if the sender has enough
		require (balanceOf[_to] + _value >= balanceOf[_to]); // Check for overflows
		require(!frozenAccount[_from]);                     // Check if sender is frozen
		require(!frozenAccount[_to]);                       // Check if recipient is frozen
		balanceOf[_from] -= _value;                         // Subtract from the sender
		balanceOf[_to] += _value;                           // Add the same to the recipient
		emit Transfer(_from, _to, _value);
	}

	/// @notice Create `mintedAmount` tokens and send it to `target`
	/// @param target Address to receive the tokens
	/// @param mintedAmount the amount of tokens it will receive
	function mintToken(address target, uint256 mintedAmount) onlyDeveloper public {
		balanceOf[target] += mintedAmount;
		totalSupply += mintedAmount;
		emit Transfer(0, this, mintedAmount);
		emit Transfer(this, target, mintedAmount);
	}

	/// @notice `freeze? Prevent | Allow` `target` from sending & receiving tokens
	/// @param target Address to be frozen
	/// @param freeze either to freeze it or not
	function freezeAccount(address target, bool freeze) onlyDeveloper public {
		frozenAccount[target] = freeze;
		emit FrozenFunds(target, freeze);
	}

	/// @notice Allow users to buy tokens for `newBuyPrice` eth and sell tokens for `newSellPrice` eth
	/// @param newSellPrice Price the users can sell to the contract
	/// @param newBuyPrice Price users can buy from the contract
	function setPrices(uint256 newSellPrice, uint256 newBuyPrice) onlyDeveloper public {
		sellPrice = newSellPrice;
		buyPrice = newBuyPrice;
	}

	/// @notice Buy tokens from contract by sending ether
	function buy() payable public {
		uint amount = msg.value / buyPrice;               // calculates the amount
		_transfer(this, msg.sender, amount);              // makes the transfers
	}

	/// @notice Sell `amount` tokens to contract
	/// @param amount amount of tokens to be sold
	function sell(uint256 amount) public {
		address myAddress = this;
		require(myAddress.balance >= amount * sellPrice);      // checks if the contract has enough ether to buy
		_transfer(msg.sender, this, amount);              // makes the transfers
		msg.sender.transfer(amount * sellPrice);          // sends ether to the seller. It's important to do this last to avoid recursion attacks
	}
}
function buy() payable public {
	uint amount = msg.value / buyPrice;               // calculates the amount
	_transfer(this, msg.sender, amount);              // makes the transfers
}

/// @notice Buy tokens from contract by sending ether