ArK

pragma solidity ^0.4.19;

library SafeMath {
    /**
    * @dev Multiplies two numbers, throws on overflow.
    */
    function mul(uint256 a, uint256 b) internal pure returns (uint256 c) {
        // Gas optimization: this is cheaper than asserting 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin- solidity/pull/522
        if (a == 0) {
            return 0; 
        }
        c = a * b;
        assert(c / a == b);
        return c;
    }
    /**
    * @dev Integer division of two numbers, truncating the quotient. 
    */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        assert(b > 0);
        // uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold
        return a / b; 
    }
    /**
    * @dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
    */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
           assert(b <= a);
           return a - b; 
    }
    /**
    * @dev Adds two numbers, throws on overflow.
    */
    function add(uint256 a, uint256 b) internal pure returns (uint256 c) {
           c = a + b;
           assert(c >= a);
           return c; 
    }
}
contract Token {

    /// @return total amount of tokens
    function totalSupply() public constant returns (uint supply);

    /// @param _owner The address from which the balance will be retrieved
    /// @return The balance
    function balanceOf(address _owner) public constant returns (uint balance);

    /// @notice send `_value` token to `_to` from `msg.sender`
    /// @param _to The address of the recipient
    /// @param _value The amount of token to be transferred
    /// @return Whether the transfer was successful or not
    function transfer(address _to, uint _value) public  returns (bool success);

    /// @notice send `_value` token to `_to` from `_from` on the condition it is approved by `_from`
    /// @param _from The address of the sender
    /// @param _to The address of the recipient
    /// @param _value The amount of token to be transferred
    /// @return Whether the transfer was successful or not
    function transferFrom(address _from, address _to, uint _value)  public  returns (bool success);

    /// @notice `msg.sender` approves `_addr` to spend `_value` tokens
    /// @param _spender The address of the account able to transfer the tokens
    /// @param _value The amount of wei to be approved for transfer
    /// @return Whether the approval was successful or not
    function approve(address _spender, uint _value) public  returns (bool success);

    /// @param _owner The address of the account owning tokens
    /// @param _spender The address of the account able to transfer the tokens
    /// @return Amount of remaining tokens allowed to spent
    function allowance(address _owner, address _spender) public  constant returns (uint remaining);

    event Transfer(address indexed _from, address indexed _to, uint _value);
    event Approval(address indexed _owner, address indexed _spender, uint _value);
}

contract RegularToken is Token {
    
    using SafeMath for uint256;
    
    function transfer(address _to, uint _value)  public   returns (bool) {
        require(_to != address(0));
        //Default assumes totalSupply can't be over max (2^256 - 1).
        require(balances[msg.sender] >= _value);
        balances[msg.sender] =  balances[msg.sender].sub(_value);
        balances[_to] = balances[_to].add(_value);
        Transfer(msg.sender, _to, _value);
        return true;
    }

    function transferFrom(address _from, address _to, uint _value)  public  returns (bool) {
        require(_to != address(0));
        require(balances[_from] >= _value);
        require(allowed[_from][msg.sender] >= _value);
        
        balances[_to] = balances[_to].add(_value);
        balances[_from] = balances[_from].sub(_value);
        allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
        Transfer(_from, _to, _value);
        return true;
    }

    function balanceOf(address _owner)  public  constant returns (uint) {
        return balances[_owner];
    }

    function approve(address _spender, uint _value) public  returns (bool) {
        require(_spender != address(0));
        allowed[msg.sender][_spender] = _value;
        Approval(msg.sender, _spender, _value);
        return true;
    }

    function allowance(address _owner, address _spender) public  constant returns (uint) {
        return allowed[_owner][_spender];
    }

    mapping (address => uint) balances;
    mapping (address => mapping (address => uint)) allowed;
    uint public totalSupply;

    function totalSupply() public constant returns (uint supply) { 
        return totalSupply;
    }
}

contract UnboundedRegularToken is RegularToken {

    uint constant MAX_UINT = 2**256 - 1;
    
    /// @dev ERC20 transferFrom, modified such that an allowance of MAX_UINT represents an unlimited amount.
    /// @param _from Address to transfer from.
    /// @param _to Address to transfer to.
    /// @param _value Amount to transfer.
    /// @return Success of transfer.
    function transferFrom(address _from, address _to, uint _value)
        public
        returns (bool)
    {
        require(_to != address(0));
        uint allowance = allowed[_from][msg.sender];
        
        require(balances[_from] >= _value);
        require(allowance >= _value);
        
        balances[_to] = balances[_to].add(_value);
        balances[_from] = balances[_from].sub(_value);
        if (allowance < MAX_UINT) {
            allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
        }
        Transfer(_from, _to, _value);
        return true;
    }
}

contract ArK is UnboundedRegularToken {
    
    uint8 constant public decimals = 18;
    string constant public name = "ArK";
    string constant public symbol = "ArK";

    function ArK() public  {
        totalSupply = 21 * 10**21;
        balances[msg.sender] = totalSupply;
        Transfer(address(0), msg.sender, totalSupply);
    }
}

{
  "compilationTarget": {
    "ArK.sol": "ArK"
  },
  "libraries": {},
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "remappings": []
}