pragma solidity ^0.4.23;

 

 

 

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 {

 

    // Public variables of the token

 

    string public name = "Yumerium Token";

 

    string public symbol = "YUM";

 

    uint8 public decimals = 8;

 

    uint256 public totalSupply = 808274854 * 10 ** uint256(decimals);

 

 

    // 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);

 

 

 

    // This notifies clients about the amount burnt

 

    event Burn(address indexed from, uint256 value);

 

 

 

    /**

 

     * Constrctor function

 

     *

 

     * Initializes contract with initial supply tokens to the creator of the contract

 

     */

 

    

 

 

 

    /**

 

     * Internal transfer, only can be called by this contract

 

     */

 

    function _transfer(address _from, address _to, uint _value) internal {

 

        // Prevent transfer to 0x0 address. Use burn() instead

 

        require(_to != 0x0);

 

        // Check if the sender has enough

 

        require(balanceOf[_from] >= _value);

 

        // Check for overflows

 

        require(balanceOf[_to] + _value > balanceOf[_to]);

 

        // Save this for an assertion in the future

 

        uint previousBalances = balanceOf[_from] + balanceOf[_to];

 

        // Subtract from the sender

 

        balanceOf[_from] -= _value;

 

        // Add the same to the recipient

 

        balanceOf[_to] += _value;

 

        Transfer(_from, _to, _value);

 

        // Asserts are used to use static analysis to find bugs in your code. They should never fail

 

        assert(balanceOf[_from] + balanceOf[_to] == previousBalances);

 

    }

 

 

 

    /**

 

     * Transfer tokens

 

     *

 

     * Send `_value` tokens to `_to` from your account

 

     *

 

     * @param _to The address of the recipient

 

     * @param _value the amount to send

 

     */

 

    function transfer(address _to, uint256 _value) public {

 

        _transfer(msg.sender, _to, _value);

 

    }
    
    
    

 

 

 

    /**

 

     * Transfer tokens from other address

 

     *

 

     * Send `_value` tokens to `_to` in behalf of `_from`

 

     *

 

     * @param _from The address of the sender

 

     * @param _to The address of the recipient

 

     * @param _value the amount to send

 

     */

 

    function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {

 

        require(_value <= allowance[_from][msg.sender]);     // Check allowance

 

        allowance[_from][msg.sender] -= _value;

 

        _transfer(_from, _to, _value);

 

        return true;

 

    }

 

 

 

    /**

 

     * Set allowance for other address

 

     *

 

     * Allows `_spender` to spend no more than `_value` tokens in your behalf

 

     *

 

     * @param _spender The address authorized to spend

 

     * @param _value the max amount they can spend

 

     */

 

    function approve(address _spender, uint256 _value) public

 

        returns (bool success) {

 

        allowance[msg.sender][_spender] = _value;

 

        return true;

 

    }

 

 

 

    /**

 

     * Set allowance for other address and notify

 

     *

 

     * Allows `_spender` to spend no more than `_value` tokens in your behalf, and then ping the contract about it

 

     *

 

     * @param _spender The address authorized to spend

 

     * @param _value the max amount they can spend

 

     * @param _extraData some extra information to send to the approved contract

 

     */

 

    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;

 

        }

 

    }

 

 

 

    /**

 

     * Destroy tokens

 

     *

 

     * Remove `_value` tokens from the system irreversibly

 

     *

 

     * @param _value the amount of money to burn

 

     */

 

    function burn(uint256 _value) public returns (bool success) {

 

        require(balanceOf[msg.sender] >= _value);   // Check if the sender has enough

 

        balanceOf[msg.sender] -= _value;            // Subtract from the sender

 

        totalSupply -= _value;                      // Updates totalSupply

 

        Burn(msg.sender, _value);

 

        return true;

 

    }

 

 

 

    /**

 

     * Destroy tokens from other account

 

     *

 

     * Remove `_value` tokens from the system irreversibly on behalf of `_from`.

 

     *

 

     * @param _from the address of the sender

 

     * @param _value the amount of money to burn

 

     */

 

    function burnFrom(address _from, uint256 _value) public returns (bool success) {

 

        require(balanceOf[_from] >= _value);                // Check if the targeted balance is enough

 

        require(_value <= allowance[_from][msg.sender]);    // Check allowance

 

        balanceOf[_from] -= _value;                         // Subtract from the targeted balance

 

        allowance[_from][msg.sender] -= _value;             // Subtract from the sender's allowance

 

        totalSupply -= _value;                              // Update totalSupply

 

        Burn(_from, _value);

 

        return true;

 

    }

 

}

 

 

 

/******************************************/

 

/*       ADVANCED TOKEN STARTS HERE       */

 

/******************************************/

 

 

 

contract Yumerium is owned, TokenERC20 {

    address public saleAddress;
    

    mapping (address => bool) public frozenAccount;

    

    event Buy(address indexed to, uint256 value);

    

    event Sell(address indexed from, uint256 value);

    event Sale(address indexed to, uint256 value);
 

    /* This generates a public event on the blockchain that will notify clients */

 

    event FrozenFunds(address target, bool frozen);

    

    function Yumerium() public {

        balanceOf[this] = totalSupply; 
        

    }
    
    
    function sale(address _to, uint256 _value) public {
        require (msg.sender == saleAddress);
        require (balanceOf[this] >= _value);
        
        balanceOf[this] -= _value;
        balanceOf[_to] += _value;
        Sale(_to, _value);
        Transfer(this, _to, _value);
    }
    
    
    function privateSale(address _to, uint256 _value) onlyOwner public {
        require (balanceOf[this] >= _value);
        
        balanceOf[this] -= _value;
        balanceOf[_to] += _value;
        Sale(_to, _value);
        Transfer(this, _to, _value);
    }
    
    
    
    function changeSaleAddress(address _saleAddress) onlyOwner public {
        saleAddress = _saleAddress;
    }
 

    /* 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

 

        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) onlyOwner public {

 

        balanceOf[target] += mintedAmount;

 

        totalSupply += mintedAmount;

 

        Transfer(0, this, mintedAmount);

 

        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) onlyOwner public {

 

        frozenAccount[target] = freeze;

 

        FrozenFunds(target, freeze);

 

    }

 

 


    

    

    function sell(uint256 amount) payable public {

        _transfer(msg.sender, owner, amount);


        Sell(msg.sender, amount);

    }

 

 

 

}