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interface tokenRecipient function re ...  contract TokenERC20    - function _transfer(address _from, add ...    - function transfer(address _to, uint25 ...    - function transferFrom(address _from, ...    - function approve(address _spender, ui ...    - function approveAndCall(address _spen ...    - function burn(uint256 _value)    - function burnFrom(address _from, uint ...  contract owned    - function transferOwnership(address ne ...  contract MyAdvancedToken is owned, ... *    - function _transfer(address _from, add ...    - function mintToken(address target, ui ...    - function freezeAccount(address target ...

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/**
 *Submitted for verification at Etherscan.io on 2020-03-22
*/

pragma solidity >=0.4.22 <0.7.0;

interface tokenRecipient { function receiveApproval(address _from, uint256 _value, address _token, bytes  _extraData) external; }

contract TokenERC20 {
    string public name;
    string public symbol;
    uint8 public decimals = 18;  // decimals 可以有的小数点个数，最小的代币单位。18 是建议的默认值
    uint256 public totalSupply;

    // 用mapping保存每个地址对应的余额
    mapping (address => uint256) public balanceOf;
    // 存储对账号的控制
    mapping (address => mapping (address => uint256)) public allowance;

    // 事件，用来通知客户端交易发生
    event Transfer(address indexed from, address indexed to, uint256 value);

    // 事件，用来通知客户端代币被消费
    event Burn(address indexed from, uint256 value);

    /**
     * 初始化构造
     */
    constructor(uint256 initialSupply, string memory tokenName, string memory tokenSymbol) public {
        totalSupply = initialSupply * 10 ** uint256(decimals);  // 供应的份额，份额跟最小的代币单位有关，份额 = 币数 * 10 ** decimals。
        balanceOf[msg.sender] = totalSupply;                // 创建者拥有所有的代币
        name = tokenName;                                   // 代币名称
        symbol = tokenSymbol;                               // 代币符号
    }

    /**
     * 代币交易转移的内部实现
     */
    function _transfer(address _from, address _to, uint _value) internal {
        // 确保目标地址不为0x0，因为0x0地址代表销毁
        require(_to != address(0x0));
        // 检查发送者余额
        require(balanceOf[_from] >= _value);
        // 确保转移为正数个
        require(balanceOf[_to] + _value > balanceOf[_to]);

        // 以下用来检查交易，
        uint previousBalances = balanceOf[_from] + balanceOf[_to];
        // Subtract from the sender
        balanceOf[_from] -= _value;
        // Add the same to the recipient
        balanceOf[_to] += _value;
        emit Transfer(_from, _to, _value);

        // 用assert来检查代码逻辑。
        assert(balanceOf[_from] + balanceOf[_to] == previousBalances);
    }

    /**
     *  代币交易转移
     * 从创建交易者账号发送`_value`个代币到 `_to`账号
     *
     * @param _to 接收者地址
     * @param _value 转移数额
     */
    function transfer(address _to, uint256 _value) public {
        _transfer(msg.sender, _to, _value);
    }

    /**
     * 账号之间代币交易转移
     * @param _from 发送者地址
     * @param _to 接收者地址
     * @param _value 转移数额
     */
    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;
    }

    /**
     * 设置某个地址（合约）可以交易者名义花费的代币数。
     *
     * 允许发送者`_spender` 花费不多于 `_value` 个代币
     *
     * @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;
    }

    /**
     * 设置允许一个地址（合约）以交易者名义可最多花费的代币数。
     *
     * @param _spender 被授权的地址（合约）
     * @param _value 最大可花费代币数
     * @param _extraData 发送给合约的附加数据
     */
    function approveAndCall(address _spender, uint256 _value, bytes memory _extraData)
        public
        returns (bool success) {
        tokenRecipient spender = tokenRecipient(_spender);
        if (approve(_spender, _value)) {
            spender.receiveApproval(msg.sender, _value, address(this), _extraData);
            return true;
        }
    }

    /**
     * 销毁创建者账户中指定个代币
     */
    function burn(uint256 _value) public returns (bool success) {
        //_value = _value * 10 ** uint256(18); 
        require(balanceOf[msg.sender] >= _value);   // Check if the sender has enough
        balanceOf[msg.sender] -= _value;            // Subtract from the sender
        totalSupply -= _value;                      // Updates totalSupply
        emit Burn(msg.sender, _value);
        return true;
    }

    /**
     * 销毁用户账户中指定个代币
     *
     * 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) {
        //_value = _value * 10 ** uint256(18);
        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
        emit Burn(_from, _value);
        return true;
    }
}

contract owned {
    address public owner;

    constructor() public {
        owner = msg.sender;
    }

    modifier onlyOwner {
        require(msg.sender == owner);
        _;
    }

    function transferOwnership(address newOwner) onlyOwner public {
        owner = newOwner;
    }
}

contract MyAdvancedToken is owned, TokenERC20 {

    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 memory tokenName,
        string memory tokenSymbol
    ) TokenERC20(initialSupply, tokenName, tokenSymbol) payable public {}

    /* Internal transfer, only can be called by this contract */
    function _transfer(address _from, address _to, uint _value) internal {
        require (_to != address(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) onlyOwner public {
        //mintedAmount = mintedAmount * 10 ** uint256(18);
        
        balanceOf[target] += mintedAmount;
        totalSupply += mintedAmount;
        emit Transfer(address(0), address(this), mintedAmount);
        emit Transfer(address(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;
        emit FrozenFunds(target, freeze);
    }

}

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