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 contract SafeMath    - function safeMul(uint256 a, uint256 b ...    - function safeDiv(uint256 a, uint256 b ...    - function safeSub(uint256 a, uint256 b ...    - function safeAdd(uint256 a, uint256 b ...  contract DT is SafeMath *    - function transfer(address _to, uint25 ...    - function approve(address _spender, ui ...    - function transferFrom(address _from, ...    - function burn(uint256 _value)    - function freeze(uint256 _value)    - function unfreeze(uint256 _value)    - function withdrawEther(uint256 amount ...

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/**
 *Submitted for verification at Etherscan.io on 2020-02-18
*/

pragma solidity ^0.4.4;

contract SafeMath {
    
    // 乘法（internal修饰的函数只能够在当前合约或子合约中使用）
    function safeMul(uint256 a, uint256 b) internal pure returns (uint256) { 
        uint256 c = a * b;
        assert(a == 0 || c / a == b);
        return c;
    }
  
    // 除法
    function safeDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        assert(b > 0);
        uint256 c = a / b;
        assert(a == b * c + a % b);
        return c;
    }
 
    // 减法
    function safeSub(uint256 a, uint256 b) internal pure returns (uint256) {
        assert(b <= a);
        assert(b >=0);
        return a - b;
    }
 
    // 加法
    function safeAdd(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        assert(c>=a && c>=b);
        return c;
    }
}
 
contract DT is SafeMath{
    // 代币的名字
    string public name; 
    // 代币的符号
    string public symbol;
    // 代币支持的小数位
    uint8 public decimals;
    // 代表发行的总量
    uint256 public totalSupply;
    // 管理者
    address public owner;
 
    // 该mapping保存账户余额，Key表示账户地址，Value表示token个数
    mapping (address => uint256) public balanceOf;
    // 该mappin保存指定帐号被授权的token个数
    // key1表示授权人，key2表示被授权人，value2表示被授权token的个数
    mapping (address => mapping (address => uint256)) public allowance;
    // 冻结指定帐号token的个数
    mapping (address => uint256) public freezeOf;
 
    // 定义事件
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Burn(address indexed from, uint256 value);
    event Freeze(address indexed from, uint256 value);
    event Unfreeze(address indexed from, uint256 value);
 
    // 构造函数（1000000, "ZhongB", 18, "ZB"）
    constructor( 
        uint256 initialSupply,  // 发行数量
        string tokenName,       // token的名字 BinanceToken
        uint8 decimalUnits,     // 最小分割，小数点后面的尾数 1ether = 10** 18wei
        string tokenSymbol      // ZB
    ) public {
        decimals = decimalUnits;                           
        balanceOf[msg.sender] = initialSupply * 10 ** 18;    
        totalSupply = initialSupply * 10 ** 18;   
        name = tokenName;      
        symbol = tokenSymbol;
        owner = msg.sender;
    }
 
    // 转账：某个人花费自己的币
    function transfer(address _to, uint256 _value) public {
        // 防止_to无效
        assert(_to != 0x0);
        // 防止_value无效                       
        assert(_value > 0);
        // 防止转账人的余额不足
        assert(balanceOf[msg.sender] >= _value);
        // 防止数据溢出
        assert(balanceOf[_to] + _value >= balanceOf[_to]);
        // 从转账人的账户中减去一定的token的个数
        balanceOf[msg.sender] = SafeMath.safeSub(balanceOf[msg.sender], _value);                     
        // 往接收帐号增加一定的token个数
        balanceOf[_to] = SafeMath.safeAdd(balanceOf[_to], _value); 
        // 转账成功后触发Transfer事件，通知其他人有转账交易发生
        emit Transfer(msg.sender, _to, _value);// Notify anyone listening that this transfer took place
    }
 
    // 授权：授权某人花费自己账户中一定数量的token
    function approve(address _spender, uint256 _value) public returns (bool success) {
        assert(_value > 0);
        allowance[msg.sender][_spender] = _value;
        return true;
    }
 
 
    // 授权转账：被授权人从_from帐号中给_to帐号转了_value个token
    function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
        // 防止地址无效
        assert(_to != 0x0);
        // 防止转账金额无效
        assert(_value > 0);
        // 检查授权人账户的余额是否足够
        assert(balanceOf[_from] >= _value);
        // 检查数据是否溢出
        assert(balanceOf[_to] + _value >= balanceOf[_to]);
        // 检查被授权人在allowance中可以使用的token数量是否足够
        assert(_value <= allowance[_from][msg.sender]);
        // 从授权人帐号中减去一定数量的token
        balanceOf[_from] = SafeMath.safeSub(balanceOf[_from], _value); 
        // 往接收人帐号中增加一定数量的token
        balanceOf[_to] = SafeMath.safeAdd(balanceOf[_to], _value); 
        // 从allowance中减去被授权人可使用token的数量
        allowance[_from][msg.sender] = SafeMath.safeSub(allowance[_from][msg.sender], _value);
        // 交易成功后触发Transfer事件，并返回true
        emit Transfer(_from, _to, _value);
        return true;
    }
 
    // 消毁币
    function burn(uint256 _value) public returns (bool success) {
        // 检查当前帐号余额是否足够
        assert(balanceOf[msg.sender] >= _value);
        // 检查_value是否有效
        assert(_value > 0);
        // 从sender账户中中减去一定数量的token
        balanceOf[msg.sender] = SafeMath.safeSub(balanceOf[msg.sender], _value);
        // 更新发行币的总量
        totalSupply = SafeMath.safeSub(totalSupply,_value);
        // 消币成功后触发Burn事件，并返回true
        emit Burn(msg.sender, _value);
        return true;
    }
 
    // 冻结
    function freeze(uint256 _value) public returns (bool success) {
        // 检查sender账户余额是否足够
        assert(balanceOf[msg.sender] >= _value);
        // 检查_value是否有效
        assert(_value > 0);
        // 从sender账户中减去一定数量的token
        balanceOf[msg.sender] = SafeMath.safeSub(balanceOf[msg.sender], _value); 
        // 往freezeOf中给sender账户增加指定数量的token
        freezeOf[msg.sender] = SafeMath.safeAdd(freezeOf[msg.sender], _value); 
        // freeze成功后触发Freeze事件，并返回true
        emit Freeze(msg.sender, _value);
        return true;
    }
 
    // 解冻
    function unfreeze(uint256 _value) public returns (bool success) {
        // 检查解冻金额是否有效
        assert(freezeOf[msg.sender] >= _value);
        // 检查_value是否有效
        assert(_value > 0); 
        // 从freezeOf中减去指定sender账户一定数量的token
        freezeOf[msg.sender] = SafeMath.safeSub(freezeOf[msg.sender], _value); 
        // 向sender账户中增加一定数量的token
        balanceOf[msg.sender] = SafeMath.safeAdd(balanceOf[msg.sender], _value);    
        // 解冻成功后触发事件
        emit Unfreeze(msg.sender, _value);
        return true;
    }
 
    // 管理者自己取钱
    function withdrawEther(uint256 amount) public {
        // 检查sender是否是当前合约的管理者
        assert(msg.sender == owner);
        // sender给owner发送token
        owner.transfer(amount);
    }
}

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-----Decoded View---------------
Arg [0] : initialSupply (uint256): 1000000
Arg [1] : tokenName (string): DT
Arg [2] : decimalUnits (uint8): 18
Arg [3] : tokenSymbol (string): DT

-----Encoded View---------------
8 Constructor Arguments found :
Arg [0] : 00000000000000000000000000000000000000000000000000000000000f4240
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000012
Arg [3] : 00000000000000000000000000000000000000000000000000000000000000c0
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000002
Arg [5] : 4454000000000000000000000000000000000000000000000000000000000000
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000002
Arg [7] : 4454000000000000000000000000000000000000000000000000000000000000

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