Contract Name:
ERC20Standard
Contract Source Code:
File 1 of 1 : ERC20Standard
pragma solidity ^0.4.11;
// 以太坊企业服务,请访问 https://www.94eth.com/tool
contract ERC20Standard {
uint256 public totalSupply;
string public name;
uint256 public decimals;
string public symbol;
address public owner;
mapping (address => uint256) balances;
mapping (address => mapping (address => uint256)) allowed;
constructor(uint256 _totalSupply, string _symbol, string _name, uint256 _decimals) public {
symbol = _symbol;
name = _name;
decimals = _decimals;
owner = msg.sender;
totalSupply = _totalSupply * (10 ** decimals);
balances[owner] = totalSupply;
}
//Fix for short address attack against ERC20
modifier onlyPayloadSize(uint size) {
assert(msg.data.length == size + 4);
_;
}
function balanceOf(address _owner) constant public returns (uint256) {
return balances[_owner];
}
function transfer(address _recipient, uint256 _value) onlyPayloadSize(2*32) public {
require(balances[msg.sender] >= _value && _value >= 0);
require(balances[_recipient] + _value >= balances[_recipient]);
balances[msg.sender] -= _value;
balances[_recipient] += _value;
emit Transfer(msg.sender, _recipient, _value);
}
function transferFrom(address _from, address _to, uint256 _value) public {
require(balances[_from] >= _value && allowed[_from][msg.sender] >= _value && _value >= 0);
require(balances[_to] + _value >= balances[_to]);
balances[_to] += _value;
balances[_from] -= _value;
allowed[_from][msg.sender] -= _value;
emit Transfer(_from, _to, _value);
}
function approve(address _spender, uint256 _value) public {
allowed[msg.sender][_spender] = _value;
emit Approval(msg.sender, _spender, _value);
}
function allowance(address _owner, address _spender) constant public returns (uint256) {
return allowed[_owner][_spender];
}
//Event which is triggered to log all transfers to this contract's event log
event Transfer(
address indexed _from,
address indexed _to,
uint256 _value
);
//Event which is triggered whenever an owner approves a new allowance for a spender.
event Approval(
address indexed _owner,
address indexed _spender,
uint256 _value
);
}
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