Mongkol99.sol

pragma solidity ^0.4.15;
// -----------------------------------------
// Mongkol 99, M99C
// (c) Bhuridech Sudsee, Under MIT License
// Thanks BokkyPooBah for original version.
// -----------------------------------------
 
contract ERC20Interface {

    function balanceOf(address _owner) constant returns (uint256 balance);
 
    function transfer(address _to, uint256 _value) returns (bool success);
 
    function transferFrom(address _from, address _to, uint256 _value) returns (bool success);
 
    function approve(address _spender, uint256 _value) returns (bool success);
 
    function allowance(address _owner, address _spender) constant returns (uint256 remaining);
 
    event Transfer(address indexed _from, address indexed _to, uint256 _value);
 
    event Approval(address indexed _owner, address indexed _spender, uint256 _value);
}
 
contract Mongkol99 is ERC20Interface {
    string public constant symbol = "M99C";
    string public constant name = "Mongkol 99";
    uint8 public constant decimals = 0;
    uint256 _totalSupply = 999;
    
    address public owner;
 
    mapping(address => uint256) balances;
 
    mapping(address => mapping (address => uint256)) allowed;
 
    // Functions with this modifier can only be executed by the owner
    modifier onlyOwner() {
        require(msg.sender != owner);
        _;
    }
 
    // Constructor
    function FixedSupplyToken() {
        owner = msg.sender;
        balances[owner] = _totalSupply;
    }
 
    // Transfer coin
    function transfer(address _to, uint256 _amount) returns (bool success) {
        if (balances[msg.sender] >= _amount 
            && _amount > 0
            && balances[_to] + _amount > balances[_to]) {
            balances[msg.sender] -= _amount;
            balances[_to] += _amount;
            Transfer(msg.sender, _to, _amount);
            return true;
        } else {
            return false;
        }
    }
    
    function transferFrom(
        address _from,
        address _to,
        uint256 _amount
    ) returns (bool success) {
        if (balances[_from] >= _amount
            && allowed[_from][msg.sender] >= _amount
            && _amount > 0
            && balances[_to] + _amount > balances[_to]) {
            balances[_from] -= _amount;
            allowed[_from][msg.sender] -= _amount;
            balances[_to] += _amount;
            Transfer(_from, _to, _amount);
            return true;
        } else {
            return false;
        }
    }
 
    function approve(address _spender, uint256 _amount) returns (bool success) {
        allowed[msg.sender][_spender] = _amount;
        Approval(msg.sender, _spender, _amount);
        return true;
    }
 
    function allowance(address _owner, address _spender) constant returns (uint256 remaining) {
        return allowed[_owner][_spender];
    }
}