BEP-20智能合约代码是可以修改的。要修改代码，需先准备好Solidity编程语言环境和智能合约开发工具。然后可以使用Solidity编辑器如 Remix 或 Visual Studio Code 编辑器等来打开合约代码文件。修改后编译和部署智能合约。

以下是修改BEP-20智能合约代码的示例：

pragma solidity ^0.8.0;

interface IERC20 { function totalSupply() external view returns (uint256); function balanceOf(address account) external view returns (uint256); function transfer(address recipient, uint256 amount) external returns (bool); function allowance(address owner, address spender) external view returns (uint256); function approve(address spender, uint256 amount) external returns (bool); function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);

}

contract MyToken is IERC20 { string public name; string public symbol; uint8 public decimals; uint256 private _totalSupply; mapping (address => uint256) private _balances; mapping (address => mapping (address => uint256)) private _allowances;

constructor(string memory _name, string memory _symbol, uint8 _decimals, uint256 _initialSupply) {
    name = _name;
    symbol = _symbol;
    decimals = _decimals;
    _totalSupply = _initialSupply * 10 ** uint256(decimals);
    _balances[msg.sender] = _totalSupply;
    emit Transfer(address(0), msg.sender, _totalSupply);
}

function totalSupply() public view override returns (uint256) {
    return _totalSupply;
}

function balanceOf(address account) public view override returns (uint256) {
    return _balances[account];
}

function transfer(address recipient, uint256 amount) public override returns (bool) {
    _transfer(msg.sender, recipient, amount);
    return true;
}

function allowance(address owner,