// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; abstract contract Context { function _msgSender() internal view virtual returns (address) { return msg.sender; } function _msgData() internal view virtual returns (bytes calldata) { return msg.data; } } abstract contract Ownable is Context { address private _owner; event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); constructor() { _setOwner(_msgSender()); } function owner() public view virtual returns (address) { return _owner; } modifier onlyOwner() { require(owner() == _msgSender(), "Ownable: caller is not the owner"); _; } function renounceOwnership() external virtual onlyOwner { _setOwner(address(0)); } function transferOwnership(address newOwner) external virtual onlyOwner { require(newOwner != address(0), "Ownable: new owner is the zero address"); _setOwner(newOwner); } function _setOwner(address newOwner) private { address oldOwner = _owner; _owner = newOwner; emit OwnershipTransferred(oldOwner, newOwner); } } contract ERC20 is Ownable { mapping(address => uint256) private _balances; mapping(address => mapping(address => uint256)) private _allowances; uint256 private _totalSupply = 1e9 ether; string private _name = "Evadore"; string private _symbol = "EVA"; uint8 private _decimals = 18; event Transfer(address indexed from, address indexed to, uint256 value); event Approval(address indexed owner, address indexed spender, uint256 value); constructor() { _balances[_msgSender()] = _totalSupply; } function name() public view virtual returns (string memory) { return _name; } function symbol() public view virtual returns (string memory) { return _symbol; } function decimals() public view virtual returns (uint8) { return _decimals; } function totalSupply() public view virtual returns (uint256) { return _totalSupply; } function balanceOf(address account) public view virtual returns (uint256) { return _balances[account]; } function transfer(address recipient, uint256 amount) external virtual returns (bool) { _transfer(_msgSender(), recipient, amount); return true; } function allowance(address owner, address spender) public view virtual returns (uint256) { return _allowances[owner][spender]; } function approve(address spender, uint256 amount) external virtual returns (bool) { _approve(_msgSender(), spender, amount); return true; } function transferFrom( address sender, address recipient, uint256 amount ) external virtual returns (bool) { _transfer(sender, recipient, amount); uint256 currentAllowance = _allowances[sender][_msgSender()]; require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance"); unchecked { _approve(sender, _msgSender(), currentAllowance - amount); } return true; } function increaseAllowance(address spender, uint256 addedValue) external virtual returns (bool) { _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue); return true; } function decreaseAllowance(address spender, uint256 subtractedValue) external virtual returns (bool) { uint256 currentAllowance = _allowances[_msgSender()][spender]; require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero"); unchecked { _approve(_msgSender(), spender, currentAllowance - subtractedValue); } return true; } function _transfer( address sender, address recipient, uint256 amount ) internal virtual { require(sender != address(0), "ERC20: transfer from the zero address"); require(recipient != address(0), "ERC20: transfer to the zero address"); uint256 senderBalance = _balances[sender]; require(senderBalance >= amount, "ERC20: transfer amount exceeds balance"); unchecked { _balances[sender] = senderBalance - amount; } _balances[recipient] += amount; emit Transfer(sender, recipient, amount); } function _approve( address owner, address spender, uint256 amount ) internal virtual { require(owner != address(0), "ERC20: approve from the zero address"); require(spender != address(0), "ERC20: approve to the zero address"); _allowances[owner][spender] = amount; emit Approval(owner, spender, amount); } }