pragma solidity ^0.4.16;

contract owned {
    address public owner;

    function owned() public {
        owner = msg.sender;
    }

    modifier onlyOwner {
        require(msg.sender == owner);
        _;
    }

    function transferOwnership(address newOwner) onlyOwner public {
        owner = newOwner;
    }
}

interface tokenRecipient { function receiveApproval(address _from, uint256 _value, address _token, bytes _extraData) public; }

contract CaratAssetsCoin {
    string public constant _myTokeName = 'Carat Assets Coin';
    string public constant _mySymbol = 'CTAC';
    uint public constant _myinitialSupply = 21000000;
    uint8 public constant _myDecimal = 0;

    string public name;
    string public symbol;
    uint8 public decimals;
   
    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);

    function CaratAssetsCoin(
        uint256 initialSupply,
        string TokeName,
        string Symbol
    ) public {
        decimals = _myDecimal;
        totalSupply = _myinitialSupply * (10 ** uint256(_myDecimal)); 
        balanceOf[msg.sender] = initialSupply;               
        name = TokeName;                                   
        symbol = Symbol;                               
    }


    function _transfer(address _from, address _to, uint _value) internal {

        require(_to != 0x0);

        require(balanceOf[_from] >= _value);

        require(balanceOf[_to] + _value > balanceOf[_to]);

        uint previousBalances = balanceOf[_from] + balanceOf[_to];

        balanceOf[_from] -= _value;

        balanceOf[_to] += _value;
        Transfer(_from, _to, _value);

        assert(balanceOf[_from] + balanceOf[_to] == previousBalances);
    }

    function transfer(address _to, uint256 _value) public {
        _transfer(msg.sender, _to, _value);
    }

    function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
        require(_value <= allowance[_from][msg.sender]);     
        allowance[_from][msg.sender] -= _value;
        _transfer(_from, _to, _value);
        return true;
    }

    function approve(address _spender, uint256 _value) public
        returns (bool success) {
        allowance[msg.sender][_spender] = _value;
        return true;
    }

    function approveAndCall(address _spender, uint256 _value, bytes _extraData)
        public
        returns (bool success) {
        tokenRecipient spender = tokenRecipient(_spender);
        if (approve(_spender, _value)) {
            spender.receiveApproval(msg.sender, _value, this, _extraData);
            return true;
        }
    }
}