pragma solidity ^0.4.18;



/**
 * Math operations with safety checks
 * By OpenZeppelin: https://github.com/OpenZeppelin/zeppelin-solidity/contracts/SafeMath.sol
 */
library SafeMath {
  function mul(uint256 a, uint256 b) internal returns (uint256) {
    uint256 c = a * b;
    assert(a == 0 || c / a == b);
    return c;
  }

  function div(uint256 a, uint256 b) internal returns (uint256) {
    // assert(b > 0); // Solidity automatically throws when dividing by 0
    uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold
    return c;
  }

  function sub(uint256 a, uint256 b) internal returns (uint256) {
    assert(b <= a);
    return a - b;
  }

  function add(uint256 a, uint256 b) internal returns (uint256) {
    uint256 c = a + b;
    assert(c >= a);
    return c;
  }

  function max64(uint64 a, uint64 b) internal constant returns (uint64) {
    return a >= b ? a : b;
  }

  function min64(uint64 a, uint64 b) internal constant returns (uint64) {
    return a < b ? a : b;
  }

  function max256(uint256 a, uint256 b) internal constant returns (uint256) {
    return a >= b ? a : b;
  }

  function min256(uint256 a, uint256 b) internal constant returns (uint256) {
    return a < b ? a : b;
  }

}



 contract ContractReceiver{
    function tokenFallback(address _from, uint256 _value, bytes  _data) external;
}


//Basic ERC23 token, backward compatible with ERC20 transfer function.
//Based in part on code by open-zeppelin: https://github.com/OpenZeppelin/zeppelin-solidity.git
contract ERC23BasicToken {
    using SafeMath for uint256;
    uint256 public totalSupply;
    mapping(address => uint256) balances;
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 value, bytes data);

    function tokenFallback(address _from, uint256 _value, bytes  _data) external {
        throw;
    }

    function transfer(address _to, uint256 _value, bytes _data) returns (bool success) {

        //Standard ERC23 transfer function

        if(isContract(_to)) {
            transferToContract(_to, _value, _data);
        }
        else {
            transferToAddress(_to, _value, _data);
        }
        return true;
    }

    function transfer(address _to, uint256 _value) {

        //standard function transfer similar to ERC20 transfer with no _data
        //added due to backwards compatibility reasons

        bytes memory empty;
        if(isContract(_to)) {
            transferToContract(_to, _value, empty);
        }
        else {
            transferToAddress(_to, _value, empty);
        }
    }

    function transferToAddress(address _to, uint256 _value, bytes _data) internal {
        balances[msg.sender] = balances[msg.sender].sub(_value);
        balances[_to] = balances[_to].add(_value);
        Transfer(msg.sender, _to, _value);
        Transfer(msg.sender, _to, _value, _data);
    }

    function transferToContract(address _to, uint256 _value, bytes _data) internal {
        balances[msg.sender] = balances[msg.sender].sub( _value);
        balances[_to] = balances[_to].add( _value);
        ContractReceiver receiver = ContractReceiver(_to);
        receiver.tokenFallback(msg.sender, _value, _data);
        Transfer(msg.sender, _to, _value);
        Transfer(msg.sender, _to, _value, _data);
    }

    function balanceOf(address _owner) constant returns (uint256 balance) {
        return balances[_owner];
    }

    //assemble the given address bytecode. If bytecode exists then the _addr is a contract.
    function isContract(address _addr) returns (bool is_contract) {
          uint256 length;
          assembly {
              //retrieve the size of the code on target address, this needs assembly
              length := extcodesize(_addr)
          }
          if(length>0) {
              return true;
          }
          else {
              return false;
          }
    }
}


 // Standard ERC23 token, backward compatible with ERC20 standards.
 // Based on code by open-zeppelin: https://github.com/OpenZeppelin/zeppelin-solidity.git
contract ERC23StandardToken is ERC23BasicToken {
    mapping (address => mapping (address => uint256)) allowed;
    event Approval (address indexed owner, address indexed spender, uint256 value);

    function transferFrom(address _from, address _to, uint256 _value) {
        var _allowance = allowed[_from][msg.sender];

        // Check is not needed because sub(_allowance, _value) will already throw if this condition is not met
        // if (_value > _allowance) throw;

        balances[_to] = balances[_to].add(_value);
        balances[_from] = balances[_from].sub(_value);
        allowed[_from][msg.sender] = _allowance.sub(_value);
        Transfer(_from, _to, _value);
    }

    function approve(address _spender, uint256 _value) {

        // To change the approve amount you first have to reduce the addresses`
        //  allowance to zero by calling `approve(_spender, 0)` if it is not
        //  already 0 to mitigate the race condition described here:
        //  https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
        if ((_value != 0) && (allowed[msg.sender][_spender] != 0)) throw;

        allowed[msg.sender][_spender] = _value;
        Approval(msg.sender, _spender, _value);
    }

    function allowance(address _owner, address _spender) constant returns (uint256 remaining) {
        return allowed[_owner][_spender];
    }

}
/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of "user permissions".
 */
contract Ownable {
  address public owner;
  event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
  /**
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
   * account.
   */
  function Ownable() {
    owner = msg.sender;
  }
  /**
   * @dev Throws if called by any account other than the owner.
   */
  modifier onlyOwner() {
    require(msg.sender == owner);
    _;
  }
  /**
   * @dev Allows the current owner to transfer control of the contract to a newOwner.
   * @param newOwner The address to transfer ownership to.
   */
  function transferOwnership(address newOwner) onlyOwner public {
    require(newOwner != address(0));
    OwnershipTransferred(owner, newOwner);
    owner = newOwner;
  }
}

/**
 * @title Mintable token
 * @dev Simple ERC20 Token example, with mintable token creation
 * @dev Issue: * https://github.com/OpenZeppelin/zeppelin-solidity/issues/120
 * Based on code by TokenMarketNet: https://github.com/TokenMarketNet/ico/blob/master/contracts/MintableToken.sol
 */
contract MintableToken is ERC23StandardToken, Ownable {
  event Mint(address indexed to, uint256 amount);
  event MintFinished();
  bool public mintingFinished = false;
  modifier canMint() {
    require(!mintingFinished);
    _;
  }
  /**
   * @dev Function to mint tokens
   * @param _to The address that will receive the minted tokens.
   * @param _amount The amount of tokens to mint.
   * @return A boolean that indicates if the operation was successful.
   */
  function mint(address _to, uint256 _amount) onlyOwner canMint public returns (bool) {
    totalSupply = totalSupply.add(_amount);
    balances[_to] = balances[_to].add(_amount);
    Mint(_to, _amount);
    Transfer(0x0, _to, _amount);
    return true;
  }
  /**
   * @dev Function to stop minting new tokens.
   * @return True if the operation was successful.
   */
  function finishMinting() onlyOwner public returns (bool) {
    mintingFinished = true;
    MintFinished();
    return true;
  }
}

contract O9COIN is MintableToken { 
  string public name="O9COIN";
  string public symbol="O9C";
  uint8 public decimals=18;

}