Lab

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract DemoToken {
    string public name = "Demo Token";
    string public symbol = "DEMO";
    uint8 public decimals = 18;
    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() {
        totalSupply = 0;
    }
    
    function mint(address to, uint256 amount) public {
        totalSupply += amount;
        balanceOf[to] += amount;
        emit Transfer(address(0), to, amount);
    }
    
    function transfer(address to, uint256 value) public returns (bool) {
        require(balanceOf[msg.sender] >= value, "Insufficient balance");
        balanceOf[msg.sender] -= value;
        balanceOf[to] += value;
        emit Transfer(msg.sender, to, value);
        return true;
    }
    
    // Additional ERC20 functions would be here...
}