【标准代币发行一】solidity文件编写

作者: gavin 分类: 区块链 发布时间: 2021-05-01 09:13

erc20interface.sol

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pragma solidity ^0.4.20;
contract ERC20Interface{
string public name; //名字
string public symbol; //符号
uint8 public decimals; //小数点位数
uint public totalSupply; //总量
function transfer(address _to, uint256 _value) returns (bool success);
function transferFrom(address _spender, uint256 _value) returns (bool success);
function approve(address _spender, uint256 _value) returns (bool success);
function allowance(address _owner, address _spender) view returns (uint256 remaining);
event Transfer(address indexed _from, address indexed _to, uint256 _value);
event Approval(address indexed _owner, address indexed _spender, uint256 _value);
}
pragma solidity ^0.4.20; contract ERC20Interface{ string public name; //名字 string public symbol; //符号 uint8 public decimals; //小数点位数 uint public totalSupply; //总量 function transfer(address _to, uint256 _value) returns (bool success); function transferFrom(address _spender, uint256 _value) returns (bool success); function approve(address _spender, uint256 _value) returns (bool success); function allowance(address _owner, address _spender) view returns (uint256 remaining); event Transfer(address indexed _from, address indexed _to, uint256 _value); event Approval(address indexed _owner, address indexed _spender, uint256 _value); }
pragma solidity ^0.4.20;

contract ERC20Interface{
    string public name;  //名字
    string public symbol;  //符号
    uint8 public decimals;  //小数点位数 
    uint public totalSupply;  //总量 
    
    function transfer(address _to, uint256 _value) returns (bool success);
    function transferFrom(address _spender, uint256 _value) returns (bool success);
    
    function approve(address _spender, uint256 _value) returns (bool success);
    function allowance(address _owner, address _spender) view returns (uint256 remaining);
    
    event Transfer(address indexed _from, address indexed _to, uint256 _value);
    event Approval(address indexed _owner, address indexed _spender, uint256 _value);
    
}

erc20.sol

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pragma solidity ^0.4.20;
//引入接口文件
import './erc20interface.sol';
contract ERC20 is ERC20Interface{
mapping(address => uint256) public balanceOf;
mapping(address => mapping(address => uint256)) allowed;
constructor(string _name) public{
name = _name; //"UpChain";
symbol = "UPT";
decimals = 0;
totalSupply = 1000000;
}
function transfer(address _to, uint256 _value) returns (bool success) {
require(_to != address(0));
require(balanceOf[msg.sender] >= _value);
require(balanceOf[_to] + _value >= balanceOf[_to]);
balanceOf[msg.sender] -= _value;
balanceOf[_to] += _value;
emit Transfer(msg.sender, _to, _value);
return true;
}
function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {
require(_to != address(0));
require(allowed[_from][msg.sender] >= _value);
require(balanceOf[_from] >= _value);
require(balanceOf[_to] + _value >= balanceOf[_to]);
balanceOf[_from] -= _value;
balanceOf[_to] += _value;
allowed[_from][msg.sender] -= _value;
emit Transfer(msg.sender, _to, _value);
return true;
}
function approve(address _spender, uint256 _value) returns (bool success) {
allowed[msg.sender][_spender] = _value;
emit Approval(msg.sender, _spender, _value);
return true;
}
function allowance(address _owner, address _spender) view returns (uint256 remaining) {
return allowed[_owner][_spender];
}
}
pragma solidity ^0.4.20; //引入接口文件 import './erc20interface.sol'; contract ERC20 is ERC20Interface{ mapping(address => uint256) public balanceOf; mapping(address => mapping(address => uint256)) allowed; constructor(string _name) public{ name = _name; //"UpChain"; symbol = "UPT"; decimals = 0; totalSupply = 1000000; } function transfer(address _to, uint256 _value) returns (bool success) { require(_to != address(0)); require(balanceOf[msg.sender] >= _value); require(balanceOf[_to] + _value >= balanceOf[_to]); balanceOf[msg.sender] -= _value; balanceOf[_to] += _value; emit Transfer(msg.sender, _to, _value); return true; } function transferFrom(address _from, address _to, uint256 _value) returns (bool success) { require(_to != address(0)); require(allowed[_from][msg.sender] >= _value); require(balanceOf[_from] >= _value); require(balanceOf[_to] + _value >= balanceOf[_to]); balanceOf[_from] -= _value; balanceOf[_to] += _value; allowed[_from][msg.sender] -= _value; emit Transfer(msg.sender, _to, _value); return true; } function approve(address _spender, uint256 _value) returns (bool success) { allowed[msg.sender][_spender] = _value; emit Approval(msg.sender, _spender, _value); return true; } function allowance(address _owner, address _spender) view returns (uint256 remaining) { return allowed[_owner][_spender]; } }
pragma solidity ^0.4.20;
//引入接口文件
import './erc20interface.sol';

contract ERC20 is ERC20Interface{
    
    mapping(address => uint256) public balanceOf;
    mapping(address => mapping(address => uint256)) allowed;
    
    constructor(string _name) public{
        name = _name;  //"UpChain";
        symbol = "UPT";
        decimals = 0;
        totalSupply = 1000000;
    }
    
    function transfer(address _to, uint256 _value) returns (bool success) {
        
        require(_to != address(0));
        require(balanceOf[msg.sender] >= _value);
        require(balanceOf[_to] + _value >= balanceOf[_to]);
        
        balanceOf[msg.sender] -= _value;
        balanceOf[_to] += _value;
        
        emit Transfer(msg.sender, _to, _value);
        
        return true;
    }
    
    function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {
        
        require(_to != address(0));
        require(allowed[_from][msg.sender] >= _value);
        require(balanceOf[_from] >= _value);
        require(balanceOf[_to] + _value >= balanceOf[_to]);
        
        balanceOf[_from] -= _value;
        balanceOf[_to] += _value;
        
        allowed[_from][msg.sender] -= _value;
        emit Transfer(msg.sender, _to, _value);
        
        return true;
    }
    
    function approve(address _spender, uint256 _value) returns (bool success) {
        allowed[msg.sender][_spender] = _value;
        
        emit Approval(msg.sender, _spender, _value);
        
        return true;
    }
    
    function allowance(address _owner, address _spender) view returns (uint256 remaining) {
        return allowed[_owner][_spender];
    }
    
}

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