pragma solidity ^0.4.10;
contract owned {
address public owner;

function owned() {
    owner = msg.sender;
}

modifier onlyOwner {
    if (msg.sender != owner) throw;
    _;
}

function transferOwnership(address newOwner) onlyOwner {
    owner = newOwner;
}
}

contract tokenRecipient { function receiveApproval(address _from, uint256 _value, address _token, bytes _extraData); }

contract token {
/* Public variables of the token */
string public standard = 'Token 0.1';
string public name;
string public symbol;
uint8 public decimals;
uint256 public totalSupply;
    event Burn(address indexed from, uint256 value);

/* This creates an array with all balances */
mapping (address => uint256) public balanceOf;
mapping (address => mapping (address => uint256)) public allowance;

/* This generates a public event on the blockchain that will notify clients */
event Transfer(address indexed from, address indexed to, uint256 value);

/* Initializes contract with initial supply tokens to the creator of the contract */
function token(
    uint256 initialSupply,
    string tokenName,
    uint8 decimalUnits,
    string tokenSymbol
    ) {
    balanceOf[msg.sender] = initialSupply;              // Give the creator all initial tokens
    totalSupply = initialSupply;                        // Update total supply
    name = tokenName;                                   // Set the name for display purposes
    symbol = tokenSymbol;                               // Set the symbol for display purposes
    decimals = decimalUnits;                            // Amount of decimals for display purposes
}

/* Send coins */
function transfer(address _to, uint256 _value) {
    if (balanceOf[msg.sender] < _value) throw;           // Check if the sender has enough
    if (balanceOf[_to] + _value < balanceOf[_to]) throw; // Check for overflows
    balanceOf[msg.sender] -= _value;                     // Subtract from the sender
    balanceOf[_to] += _value;                            // Add the same to the recipient
    Transfer(msg.sender, _to, _value);                   // Notify anyone listening that this transfer took place
}

/* Allow another contract to spend some tokens in your behalf */
function approve(address _spender, uint256 _value)
    returns (bool success) {
    allowance[msg.sender][_spender] = _value;
    return true;
}

/* Approve and then communicate the approved contract in a single tx */
function approveAndCall(address _spender, uint256 _value, bytes _extraData)
    returns (bool success) {    
    tokenRecipient spender = tokenRecipient(_spender);
    if (approve(_spender, _value)) {
        spender.receiveApproval(msg.sender, _value, this, _extraData);
        return true;
    }
}

/* A contract attempts to get the coins */
function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {
    if (balanceOf[_from] < _value) throw;                 // Check if the sender has enough
    if (balanceOf[_to] + _value < balanceOf[_to]) throw;  // Check for overflows
    if (_value > allowance[_from][msg.sender]) throw;   // Check allowance
    balanceOf[_from] -= _value;                          // Subtract from the sender
    balanceOf[_to] += _value;                            // Add the same to the recipient
    allowance[_from][msg.sender] -= _value;
    Transfer(_from, _to, _value);
    return true;
}

/* This unnamed function is called whenever someone tries to send ether to it */
function () {
    throw;     // Prevents accidental sending of ether
}
}

contract MyAdvancedToken is owned, token {

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 */
function MyAdvancedToken(
    uint256 initialSupply,
    string tokenName,
    uint8 decimalUnits,
    string tokenSymbol
) token (initialSupply, tokenName, decimalUnits, tokenSymbol) {}

/* Send coins */
function transfer(address _to, uint256 _value) {
    if (balanceOf[msg.sender] < _value) throw;           // Check if the sender has enough
    if (balanceOf[_to] + _value < balanceOf[_to]) throw; // Check for overflows
    if (frozenAccount[msg.sender]) throw;                // Check if frozen
    balanceOf[msg.sender] -= _value;                     // Subtract from the sender
    balanceOf[_to] += _value;                            // Add the same to the recipient
    Transfer(msg.sender, _to, _value);                   // Notify anyone listening that this transfer took place
}


/* A contract attempts to get the coins */
function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {
    if (frozenAccount[_from]) throw;                        // Check if frozen            
    if (balanceOf[_from] < _value) throw;                 // Check if the sender has enough
    if (balanceOf[_to] + _value < balanceOf[_to]) throw;  // Check for overflows
    if (_value > allowance[_from][msg.sender]) throw;   // Check allowance
    balanceOf[_from] -= _value;                          // Subtract from the sender
    balanceOf[_to] += _value;                            // Add the same to the recipient
    allowance[_from][msg.sender] -= _value;
    Transfer(_from, _to, _value);
    return true;
}

function mintToken(address target, uint256 mintedAmount) onlyOwner {
    balanceOf[target] += mintedAmount;
    totalSupply += mintedAmount;
    Transfer(0, this, mintedAmount);
    Transfer(this, target, mintedAmount);
}

function freezeAccount(address target, bool freeze) onlyOwner {
    frozenAccount[target] = freeze;
    FrozenFunds(target, freeze);
}
function unfreezeAccount(address target, bool freeze) onlyOwner {
    frozenAccount[target] = !freeze;
    FrozenFunds(target, !freeze);
}


function setPrices(uint256 newSellPrice, uint256 newBuyPrice) onlyOwner {
    sellPrice = newSellPrice;
    buyPrice = newBuyPrice;
}

function buy() payable {
    uint amount = msg.value / buyPrice;                // calculates the amount
    if (balanceOf[this] < amount) throw;               // checks if it has enough to sell
    balanceOf[msg.sender] += amount;                   // adds the amount to buyer's balance
    balanceOf[this] -= amount;                         // subtracts amount from seller's balance
    Transfer(this, msg.sender, amount);                // execute an event reflecting the change
}

function sell(uint256 amount) {
    if (balanceOf[msg.sender] < amount ) throw;        // checks if the sender has enough to sell
    balanceOf[this] += amount;                         // adds the amount to owner's balance
    balanceOf[msg.sender] -= amount;                   // subtracts the amount from seller's balance
    if (!msg.sender.send(amount * sellPrice)) {        // sends ether to the seller. It's important
        throw;                                         // to do this last to avoid recursion attacks
    } else {
        Transfer(msg.sender, this, amount);            // executes an event reflecting on the change
    }               
}
    
    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;
    }
}