pragma solidity ^0.4.16;

contract owned {

    address public owner;

    function owned() public {
    owner = msg.sender;
    }

   
    modifier onlyOwner {
        require(msg.sender == owner);
        _;
    }

    
    function transferOwnership(address newOwner) onlyOwner public {
        owner = newOwner;
    }   
}


interface tokenRecipient { function receiveApproval(address _from, uint256 _value, address _token, bytes _extraData) public; }

contract TokenERC20 {
    
    string public name;             
    string public symbol;          
    uint8 public decimals = 18;     

    uint256 public totalSupply;     


    mapping (address => uint256) public balanceOf;

   
    mapping (address => mapping (address => uint256)) public allowance;

   
    event Transfer(address indexed from, address indexed to, uint256 value);

  
    event Burn(address indexed from, uint256 value);


    function TokenERC20(
        uint256 initialSupply,
        string tokenName,
        string tokenSymbol
    ) public {
        totalSupply = initialSupply * 10 ** uint256(decimals);  
        balanceOf[msg.sender] = totalSupply;                   
        name = tokenName;                                       
        symbol = tokenSymbol;                                   
    }


    function _transfer(address _from, address _to, uint _value) internal {
        
        require(_to != 0x0);
        
        require(balanceOf[_from] >= _value);
       
        require(balanceOf[_to] + _value > balanceOf[_to]);
        
        uint previousBalances = balanceOf[_from] + balanceOf[_to];
        
        balanceOf[_from] -= _value;
        
        balanceOf[_to] += _value;
        Transfer(_from, _to, _value);
        
        assert(balanceOf[_from] + balanceOf[_to] == previousBalances);
    }

    
    function transfer(address _to, uint256 _value) public {
        _transfer(msg.sender, _to, _value);
    }


    function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
        require(_value <= allowance[_from][msg.sender]);     
        allowance[_from][msg.sender] -= _value;
        _transfer(_from, _to, _value);
        return true;
    }


    function approve(address _spender, uint256 _value) public
        returns (bool success) {
        allowance[msg.sender][_spender] = _value;
        return true;
    }

   

    function approveAndCall(address _spender, uint256 _value, bytes _extraData)
        public
        returns (bool success) {
        tokenRecipient spender = tokenRecipient(_spender);
        if (approve(_spender, _value)) {
            spender.receiveApproval(msg.sender, _value, this, _extraData);
            return true;
        }
    }

   
    function burn(uint256 _value) public returns (bool success) {
        require(balanceOf[msg.sender] >= _value);   
        balanceOf[msg.sender] -= _value;            
        totalSupply -= _value;                     
        Burn(msg.sender, _value);
        return true;
    }

   
    function burnFrom(address _from, uint256 _value) public returns (bool success) {
        require(balanceOf[_from] >= _value);                
        require(_value <= allowance[_from][msg.sender]);   
        balanceOf[_from] -= _value;                         
        allowance[_from][msg.sender] -= _value;             
        totalSupply -= _value;                             
        Burn(_from, _value);
        return true;
    }
}


contract CreateCodeToken is owned, TokenERC20 {

    uint256 public sellPrice;
    uint256 public buyPrice;

   
    mapping (address => bool) public frozenAccount;

    event FrozenFunds(address target, bool frozen);

   
    function CreateCodeToken(
        uint256 initialSupply,
        string tokenName,
        string tokenSymbol
    ) TokenERC20(initialSupply, tokenName, tokenSymbol) public {}

   
    function _transfer(address _from, address _to, uint _value) internal {
        require (_to != 0x0);                              
        require (balanceOf[_from] >= _value);               
        require (balanceOf[_to] + _value > balanceOf[_to]); 
        require(!frozenAccount[_from]);                    
        require(!frozenAccount[_to]);                       
        balanceOf[_from] -= _value;                        
        balanceOf[_to] += _value;                          
        Transfer(_from, _to, _value);
    }


    function mintToken(address target, uint256 mintedAmount) onlyOwner public {
        balanceOf[target] += mintedAmount;
        totalSupply += mintedAmount;
        Transfer(0, this, mintedAmount);
        Transfer(this, target, mintedAmount);

    }


    function freezeAccount(address target, bool freeze) onlyOwner public {
        frozenAccount[target] = freeze;
        FrozenFunds(target, freeze);
    }

    function setPrices(uint256 newSellPrice, uint256 newBuyPrice) onlyOwner public {
        sellPrice = newSellPrice;
        buyPrice = newBuyPrice;
    }

    function safedrawal(uint256 amount) onlyOwner public {
        msg.sender.transfer(amount);          
        Transfer(this,msg.sender, amount);
    }
    
    function () public payable {
       uint amount = msg.value * buyPrice;              
        _transfer(this, msg.sender, amount);           
        Transfer(this, msg.sender, amount);
    }


    
    function buy() payable public {
        uint amount = msg.value * buyPrice;              
        _transfer(this, msg.sender, amount);             
        Transfer(this, msg.sender, amount);
    }

    function sell(uint256 amount) public {
        require(this.balance >= amount / sellPrice);     
        _transfer(msg.sender, this, amount);             
        msg.sender.transfer(amount / sellPrice);        
        Transfer(msg.sender, this, amount);
    }
}