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;

 

    }

 

}
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);

 

}

/**
 
 
 
 * Internal transfer, only can be called by this contract
 
 
 
 */