pragma solidity ^0.8.0;
contract MyToken {
string public name = "My Token";
string public symbol = "MT";
uint8 public decimals = 18;
uint256 public totalSupply = 1000000 * (10 ** uint256(decimals));
address public owner;
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() {
owner = msg.sender;
balanceOf[msg.sender] = totalSupply;
}
modifier onlyOwner() {
require(msg.sender == owner, "Only the contract owner can call this function");
_;
}
function transfer(address to, uint256 value) external returns (bool success) {
require(to != address(0), "Invalid address");
require(balanceOf[msg.sender] >= value, "Insufficient balance");
balanceOf[msg.sender] -= value;
balanceOf[to] += value;
emit Transfer(msg.sender, to, value);
return true;
}
function approve(address spender, uint256 value) external returns (bool success) {
allowance[msg.sender][spender] = value;
emit Approval(msg.sender, spender, value);
return true;
}
function transferFrom(address from, address to, uint256 value) external returns (bool success) {
require(to != address(0), "Invalid address");
require(balanceOf[from] >= value, "Insufficient balance");
require(allowance[from][msg.sender] >= value, "Allowance exceeded");
balanceOf[from] -= value;
balanceOf[to] += value;
allowance[from][msg.sender] -= value;
emit Transfer(from, to, value);
return true;
}
function mint(uint256 amount) external onlyOwner {
require(totalSupply + amount > totalSupply, "Overflow detected");
require(balanceOf[owner] + amount > balanceOf[owner], "Overflow detected");
totalSupply += amount;
balanceOf[owner] += amount;
emit Transfer(address(0), owner, amount);
}
}
