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ERC20 simple code
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pragma solidity ^0.5.0; | |
contract Token { | |
string public name = "陳之汗😓"; | |
string public symbol = "SWEAT"; | |
uint256 public totalSupply; | |
uint8 public decimals = 0; | |
event Transfer( | |
address indexed _from, | |
address indexed _to, | |
uint256 _value | |
); | |
event Approval( | |
address indexed _owner, | |
address indexed _spender, | |
uint256 _value | |
); | |
mapping(address => uint256) public balanceOf; | |
mapping(address => mapping(address => uint256)) public allowance; | |
constructor(uint256 _initialSupply) public { | |
balanceOf[msg.sender] = _initialSupply; | |
totalSupply = _initialSupply; | |
} | |
function transfer(address _to, uint256 _value) public returns (bool success) { | |
require(balanceOf[msg.sender] >= _value); | |
balanceOf[msg.sender] -= _value; | |
balanceOf[_to] += _value; | |
emit Transfer(msg.sender, _to, _value); | |
return true; | |
} | |
function approve(address _spender, uint256 _value) public returns (bool success) { | |
allowance[msg.sender][_spender] = _value; | |
emit Approval(msg.sender, _spender, _value); | |
return true; | |
} | |
function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) { | |
require(_value <= balanceOf[_from]); | |
require(_value <= allowance[_from][msg.sender]); | |
balanceOf[_from] -= _value; | |
balanceOf[_to] += _value; | |
allowance[_from][msg.sender] -= _value; | |
emit Transfer(_from, _to, _value); | |
return true; | |
} | |
} |
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