Contract Source Code (Solidity Multiple files format)

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pragma solidity ^0.4.24;

import './IERC20.sol';

contract ETToken is IERC20 {
    
    
    uint public constant _totalSupply = 2100000000000000000000000000;
    string public constant name = "Gold brick five blessings";                   //名称，例如"My test token"
    uint8 public constant decimals = 18;               //返回token使用的小数点后几位。比如如果设置为3，就是支持0.001表示.
    string public constant symbol = "BCAC";               //token简称,like MTT
   // string public name = "ET Token";                   //名称，例如"My test token"
    //uint8 public decimals = 4;               //返回token使用的小数点后几位。比如如果设置为3，就是支持0.001表示.
   // string public symbol = "ET";               //token简称,like MTT
    
    mapping (address => uint256) balances;
    mapping (address => mapping (address => uint256)) allowed;
    
    function ETToken()  {
        balances[msg.sender] = _totalSupply; // 初始token数量给予消息发送者，因为是构造函数，所以这里也是合约的创建者
    }
        
     function totalSupply() constant returns (uint256 totalSupply){
     return _totalSupply;
  }
    
    function balanceOf(address _owner) constant returns (uint256 balance){
        return balances[_owner];
        
    }


    function transfer(address _to, uint256 _value) public returns (bool success) {
        //默认totalSupply 不会超过最大值 (2^256 - 1).
        //如果随着时间的推移将会有新的token生成，则可以用下面这句避免溢出的异常
        require(balances[msg.sender] >= _value && balances[_to] + _value > balances[_to]);
        require(_to != 0x0);
        balances[msg.sender] -= _value;//从消息发送者账户中减去token数量_value
        balances[_to] += _value;//往接收账户增加token数量_value
        Transfer(msg.sender, _to, _value);//触发转币交易事件
        return true;
    }


    function transferFrom(address _from, address _to, uint256 _value) public returns 
    (bool success) {
        require(balances[_from] >= _value && allowed[_from][msg.sender] >= _value);
        balances[_to] += _value;//接收账户增加token数量_value
        balances[_from] -= _value; //支出账户_from减去token数量_value
        allowed[_from][msg.sender] -= _value;//消息发送者可以从账户_from中转出的数量减少_value
        Transfer(_from, _to, _value);//触发转币交易事件
        return true;
    }


    function approve(address _spender, uint256 _value) public returns (bool success)   
    { 
        allowed[msg.sender][_spender] = _value;
        Approval(msg.sender, _spender, _value);
        return true;
    }

    function allowance(address _owner, address _spender) public constant returns (uint256 remaining) {
        return allowed[_owner][_spender];//允许_spender从_owner中转出的token数
    }

}

pragma solidity ^0.4.11;

interface IERC20 {
      //function name() constant returns (string name);
      //function symbol() constant returns (string symbol);
     //function decimals() constant returns (uint8 decimals);
      //function totalSupply() constant returns (uint256 totalSupply);
      //function balanceOf(address _owner) constant returns (uint256 balance);
     // function transfer(address _to, uint _value) returns (bool success);
     // function transferFrom(address _from, address _to, uint _value) returns (bool success);
     // function approve(address _spender, uint _value) returns (bool success);
     // function allowance(address _owner, address _spender) constant returns (uint remaining);
      event Transfer(address indexed _from, address indexed _to, uint _value);
      event Approval(address indexed _owner, address indexed _spender, uint _value);
    }

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[{"constant":true,"inputs":[],"name":"name","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_spender","type":"address"},{"name":"_value","type":"uint256"}],"name":"approve","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"name":"totalSupply","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_from","type":"address"},{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"name":"transferFrom","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"_totalSupply","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"}],"name":"balanceOf","outputs":[{"name":"balance","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"name":"transfer","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"},{"name":"_spender","type":"address"}],"name":"allowance","outputs":[{"name":"remaining","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_from","type":"address"},{"indexed":true,"name":"_to","type":"address"},{"indexed":false,"name":"_value","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_owner","type":"address"},{"indexed":true,"name":"_spender","type":"address"},{"indexed":false,"name":"_value","type":"uint256"}],"name":"Approval","type":"event"}]

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