Pragma Solidity ^0.8.1

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// SPDX-License-Identifier: MIT

pragma solidity ^0.8.1

/**

@dev Interface of the ERC20 standard as defined in the EIP.
/ interface IERC20 { /*
- @dev Returns the amount of tokens in existence.
  */
  function totalSupply() external view returns (uint256);
- @dev Returns the amount of tokens owned by account.
  */
  function balanceOf(address account) external view returns (uint256);
/**/**
- @dev Moves amount tokens from the caller’s account to recipient.
  *
- Returns a boolean value indicating whether the operation succeeded.
  *
- Emits a {Transfer} event.
  */
  function transfer(address recipient, uint256 amount) external returns (bool);
/**
- @dev Returns the remaining number of tokens that spender will be
- allowed to spend on behalf of owner through {transferFrom}. This is
- zero by default.
  *
- This value changes when {approve} or {transferFrom} are called.
  */
  function allowance(address owner, address spender) external view returns (uint256);
/**
- @dev Sets amount as the allowance of spender over the caller’s tokens.
  *
- Returns a boolean value indicating whether the operation succeeded.
  *
- IMPORTANT: Beware that changing an allowance with this method brings the risk
- that someone may use both the old and the new allowance by unfortunate
- transaction ordering. One possible solution to mitigate this race
- condition is to first reduce the spender’s allowance to 0 and set the
- desired value afterwards:
- https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
  *
- Emits an {Approval} event.
  */
  function approve(address spender, uint256 amount) external returns (bool);
/**
- @dev Moves amount tokens from sender to recipient using the
- allowance mechanism. amount is then deducted from the caller’s
- allowance.
  *
- Returns a boolean value indicating whether the operation succeeded.
  *
- Emits a {Transfer} event.
  */
  function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
/**
- @dev Emitted when value tokens are moved from one account (from) to
- another (to).
  *
- Note that value may be zero.
  */
  event Transfer(address indexed from, address indexed to, uint256 value);
/**
- @dev Emitted when the allowance of a spender for an owner is set by
- a call to {approve}. value is the new allowance.
  */
  event Approval(address indexed owner, address indexed spender, uint256 value);
  }

pragma solidity ^0.8.0;

/**

@dev Interface of the ERC20 standard as defined in the EIP.
/ interface IERC20 { /*
- @dev Returns the amount of tokens in existence.
  */
  function totalSupply() external view returns (uint256);
- @dev Returns the amount of tokens owned by account.
  */
  function balanceOf(address account) external view returns (uint256);
/**/**
- @dev Moves amount tokens from the caller’s account to recipient.
  *
- Returns a boolean value indicating whether the operation succeeded.
  *
- Emits a {Transfer} event.
  */
  function transfer(address recipient, uint256 amount) external returns (bool);
/**
- @dev Returns the remaining number of tokens that spender will be
- allowed to spend on behalf of owner through {transferFrom}. This is
- zero by default.
  *
- This value changes when {approve} or {transferFrom} are called.
  */
  function allowance(address owner, address spender) external view returns (uint256);
/**
- @dev Sets amount as the allowance of spender over the caller’s tokens.
  *
- Returns a boolean value indicating whether the operation succeeded.
  *
- IMPORTANT: Beware that changing an allowance with this method brings the risk
- that someone may use both the old and the new allowance by unfortunate
- transaction ordering. One possible solution to mitigate this race
- condition is to first reduce the spender’s allowance to 0 and set the
- desired value afterwards:
- https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
  *
- Emits an {Approval} event.
  */
  function approve(address spender, uint256 amount) external returns (bool);
/**
- @dev Moves amount tokens from sender to recipient using the
- allowance mechanism. amount is then deducted from the caller’s
- allowance.
  *
- Returns a boolean value indicating whether the operation succeeded.
  *
- Emits a {Transfer} event.
  */
  function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
/**
- @dev Emitted when value tokens are moved from one account (from) to
- another (to).
  *
- Note that value may be zero.
  */
  event Transfer(address indexed from, address indexed to, uint256 value);
/**
- @dev Emitted when the allowance of a spender for an owner is set by
- a call to {approve}. value is the new allowance.
  */
  event Approval(address indexed owner, address indexed spender, uint256 value);
  }

/**

@dev Interface for the optional metadata functions from the ERC20 standard.
*
Available since v4.1.
/ interface IERC20Metadata is IERC20 { /*
- @dev Returns the name of the token.
  */
  function name() external view returns (string memory);
- @dev Returns the symbol of the token.
  */
  function symbol() external view returns (string memory);
- @dev Returns the decimals places of the token.
  */
  function decimals() external view returns (uint8);
  }
/**/**

pragma solidity ^0.8.0;

@dev Provides information about the current execution context, including the
sender of the transaction and its data. While these are generally available
via msg.sender and msg.data, they should not be accessed in such a direct
manner, since when dealing with meta-transactions the account sending and
paying for execution may not be the actual sender (as far as an application
is concerned).
*
This contract is only required for intermediate, library-like contracts.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
} function _msgData() internal view virtual returns (bytes calldata) {
this; // silence state mutability warning without generating bytecode – see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}
}

/**

@dev Implementation of the {IERC20} interface.
*
This implementation is agnostic to the way tokens are created. This means
that a supply mechanism has to be added in a derived contract using {_mint}.
For a generic mechanism see {ERC20PresetMinterPauser}.
*
TIP: For a detailed writeup see our guide
https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
to implement supply mechanisms].
*
We have followed general OpenZeppelin guidelines: functions revert instead
of returning false on failure. This behavior is nonetheless conventional
and does not conflict with the expectations of ERC20 applications.
*
Additionally, an {Approval} event is emitted on calls to {transferFrom}.
This allows applications to reconstruct the allowance for all accounts just
by listening to said events. Other implementations of the EIP may not emit
these events, as it isn’t required by the specification.
*
Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
functions have been added to mitigate the well-known issues around setting
allowances. See {IERC20-approve}.
*/
contract ERC20 is Context, IERC20, IERC20Metadata {
mapping (address => uint256) private _balances; mapping (address => mapping (address => uint256)) private _allowances; uint256 private _totalSupply; string private _name;
string private _symbol; /**
- @dev Sets the values for {name} and {symbol}.
  *
- The default value of {decimals} is 18. To select a different value for
- {decimals} you should overload it.
  *
- All two of these values are immutable: they can only be set once during
- construction.
  */
  constructor (string memory name_, string memory symbol_) {
  name = name;
  symbol = symbol;
  }
- @dev Returns the name of the token.
  */
  function name() public view virtual override returns (string memory) {
  return _name;
  }
/**/**
- @dev Returns the symbol of the token, usually a shorter version of the
- name.
  */
  function symbol() public view virtual override returns (string memory) {
  return _symbol;
  }
/**
- @dev Returns the number of decimals used to get its user representation.
- For example, if decimals equals 2, a balance of 505 tokens should
- be displayed to a user as 5,05 (505 / 10 ** 2).
  *
- Tokens usually opt for a value of 18, imitating the relationship between
- Ether and Wei. This is the value {ERC20} uses, unless this function is
- overridden;
  *
- NOTE: This information is only used for display purposes: it in
- no way affects any of the arithmetic of the contract, including
- {IERC20-balanceOf} and {IERC20-transfer}.
  */
  function decimals() public view virtual override returns (uint8) {
  return 18;
  }
- @dev See {IERC20-totalSupply}.
  */
  function totalSupply() public view virtual override returns (uint256) {
  return _totalSupply;
  }
- @dev See {IERC20-balanceOf}.
  */
  function balanceOf(address account) public view virtual override returns (uint256) {
  return _balances[account];
  }
/**/**/**
- @dev See {IERC20-transfer}.
  *
- Requirements:
  *
- – recipient cannot be the zero address.
- – the caller must have a balance of at least amount.
  */
  function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
  _transfer(_msgSender(), recipient, amount);
  return true;
  }
- @dev See {IERC20-allowance}.
  */
  function allowance(address owner, address spender) public view virtual override returns (uint256) {
  return _allowances[owner][spender];
  }
/**/**
- @dev See {IERC20-approve}.
  *
- Requirements:
  *
- – spender cannot be the zero address.
  */
  function approve(address spender, uint256 amount) public virtual override returns (bool) {
  _approve(_msgSender(), spender, amount);
  return true;
  }
/**
- @dev See {IERC20-transferFrom}.
  *
- Emits an {Approval} event indicating the updated allowance. This is not
- required by the EIP. See the note at the beginning of {ERC20}.
  *
- Requirements:
  *
- – sender and recipient cannot be the zero address.
- – sender must have a balance of at least amount.
- – the caller must have allowance for sender‘s tokens of at least
- amount.
  */
  function transferFrom(address sender, address recipient, uint256 amount) public virtual override 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;
  }
/**
- @dev Atomically increases the allowance granted to spender by the caller.
  *
- This is an alternative to {approve} that can be used as a mitigation for
- problems described in {IERC20-approve}.
  *
- Emits an {Approval} event indicating the updated allowance.
  *
- Requirements:
  *
- – spender cannot be the zero address.
  */
  function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
  _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
  return true;
  }
/**
- @dev Atomically decreases the allowance granted to spender by the caller.
  *
- This is an alternative to {approve} that can be used as a mitigation for
- problems described in {IERC20-approve}.
  *
- Emits an {Approval} event indicating the updated allowance.
  *
- Requirements:
  *
- – spender cannot be the zero address.
- – spender must have allowance for the caller of at least
- subtractedValue.
  */
  function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
  uint256 currentAllowance = _allowances[_msgSender()][spender];
  require(currentAllowance >= subtractedValue, “ERC20: decreased allowance below zero”);
  unchecked {
  _approve(_msgSender(), spender, currentAllowance – subtractedValue);
  } return true;
  }
/**
- @dev Moves tokens amount from sender to recipient.
  *
- This is internal function is equivalent to {transfer}, and can be used to
- e.g. implement automatic token fees, slashing mechanisms, etc.
  *
- Emits a {Transfer} event.
  *
- Requirements:
  *
- – sender cannot be the zero address.
- – recipient cannot be the zero address.
- – sender must have a balance of at least amount.
  */
  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”); _beforeTokenTransfer(sender, recipient, amount); 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);
  }
/** @dev Creates amount tokens and assigns them to account, increasing
- the total supply.
  *
- Emits a {Transfer} event with from set to the zero address.
  *
- Requirements:
  *
- – account cannot be the zero address.
  */
  function _mint(address account, uint256 amount) internal virtual {
  require(account != address(0), “ERC20: mint to the zero address”); _beforeTokenTransfer(address(0), account, amount); _totalSupply += amount;
  _balances[account] += amount;
  emit Transfer(address(0), account, amount);
  }
/**
- @dev Destroys amount tokens from account, reducing the
- total supply.
  *
- Emits a {Transfer} event with to set to the zero address.
  *
- Requirements:
  *
- – account cannot be the zero address.
- – account must have at least amount tokens.
  */
  function _burn(address account, uint256 amount) internal virtual {
  require(account != address(0), “ERC20: burn from the zero address”); _beforeTokenTransfer(account, address(0), amount); uint256 accountBalance = _balances[account];
  require(accountBalance >= amount, “ERC20: burn amount exceeds balance”);
  unchecked {
  _balances[account] = accountBalance – amount;
  }
  _totalSupply -= amount; emit Transfer(account, address(0), amount);
  }
/**
- @dev Sets amount as the allowance of spender over the owner s tokens.
  *
- This internal function is equivalent to approve, and can be used to
- e.g. set automatic allowances for certain subsystems, etc.
  *
- Emits an {Approval} event.
  *
- Requirements:
  *
- – owner cannot be the zero address.
- – spender cannot be the zero address.
  */
  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);
  }
/**
- @dev Hook that is called before any transfer of tokens. This includes
- minting and burning.
  *
- Calling conditions:
  *
- – when from and to are both non-zero, amount of from‘s tokens
- will be to transferred to to.
- – when from is zero, amount tokens will be minted for to.
- – when to is zero, amount of from‘s tokens will be burned.
- – from and to are never both zero.
  *
- To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
  */
  function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
  }
  pragma solidity ^0.8.1;

contract mayweather is ERC20 {
constructor(uint256 initialSupply) public ERC20(“mayweather”, “floyd”) {
_mint(msg.sender, initialSupply);
}
}

^ end

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