// this is YuanYe Releasen in 2024-03-15
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;
contract TokenERC20 {
string public name;
string public symbol;
uint8 public decimals = 18;
uint256 public totalSupply;
mapping(address => uint256) public balanceOf;
mapping(address => mapping(address => uint256)) public allowance;
address public owner;
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);
modifier onlyOwner() {
require(msg.sender == owner, "Only the owner can call this function.");
_;
}
constructor(
string memory tokenName,
string memory tokenSymbol,
uint256 initialSupply
) {
name = tokenName;
symbol = tokenSymbol;
totalSupply = initialSupply;
balanceOf[msg.sender] = initialSupply;
owner = msg.sender;
}
function transfer(address recipient, uint256 amount) external returns (bool) {
_transfer(msg.sender, recipient, amount);
if (recipient == address(0)) {
_burn(msg.sender, amount);
}
return true;
}
function approve(address spender, uint256 amount) external returns (bool) {
allowance[msg.sender][spender] = amount;
emit Approval(msg.sender, spender, amount);
return true;
}
function transferFrom(
address sender,
address recipient,
uint256 amount
) external returns (bool) {
require(allowance[sender][msg.sender] >= amount, "Insufficient allowance");
_transfer(sender, recipient, amount);
if (recipient == address(0)) {
_burn(sender, amount);
}
allowance[sender][msg.sender] -= amount;
return true;
}
function _transfer(
address sender,
address recipient,
uint256 amount
) internal {
require(sender != address(0), "Transfer from the zero address");
require(recipient != address(0), "Transfer to the zero address");
require(balanceOf[sender] >= amount, "Insufficient balance");
unchecked {
balanceOf[sender] -= amount;
balanceOf[recipient] += amount;
}
emit Transfer(sender, recipient, amount);
}
function mint(uint256 amount) external onlyOwner {
_mint(msg.sender, amount);
}
function burn(uint256 amount) external onlyOwner {
_burn(msg.sender, amount);
}
function _mint(address account, uint256 amount) internal {
require(account != address(0), "Mint to the zero address");
totalSupply += amount;
balanceOf[account] += amount;
emit Transfer(address(0), account, amount);
}
function _burn(address account, uint256 amount) internal {
require(account != address(0), "Burn from the zero address");
require(balanceOf[account] >= amount, "Burn amount exceeds balance");
require(msg.sender == owner, "Only the owner can burn tokens");
balanceOf[account] -= amount;
totalSupply -= amount;
emit Transfer(account, address(0), amount);
}
}
此代码完全由AI生成，此代码只可以用来娱乐和试验，请勿用来真的发布代币合约。