Created
March 24, 2023 17:28
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This is a basic implementation of an ERC-20 token
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pragma solidity ^0.8.0; | |
contract LotToken { | |
string public name; | |
string public symbol; | |
uint8 public decimals; | |
uint256 public totalSupply; | |
mapping (address => uint256) public balanceOf; | |
mapping (address => mapping (address => uint256)) public allowance; | |
event Transfer(address indexed from, address indexed to, uint256 value); | |
event Approval(address indexed owner, address indexed spender, uint256 value); | |
constructor( | |
string memory _name, | |
string memory _symbol, | |
uint8 _decimals, | |
uint256 _totalSupply | |
) { | |
name = _name; | |
symbol = _symbol; | |
decimals = _decimals; | |
totalSupply = _totalSupply; | |
balanceOf[msg.sender] = _totalSupply; | |
emit Transfer(address(0), msg.sender, _totalSupply); | |
} | |
function transfer(address _to, uint256 _value) public 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 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(_to != address(0)); | |
require(balanceOf[_from] >= _value); | |
require(allowance[_from][msg.sender] >= _value); | |
require(balanceOf[_to] + _value >= balanceOf[_to]); | |
balanceOf[_from] -= _value; | |
balanceOf[_to] += _value; | |
allowance[_from][msg.sender] -= _value; | |
emit Transfer(_from, _to, _value); | |
return true; | |
} | |
} |
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