pragma solidity ^0.4.16;

interface tokenRecipient { function receiveApproval(address _from, uint256 _value, address _token, bytes _extraData) public; }

contract TOMAToken {

    string public name;							
    string public symbol;						
    uint8  public decimals = 18;			
    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);

    event Burn(address indexed from, uint256 value);

   
    function TOMAToken (
        uint256 initialSupply,
        string tokenName,
        string tokenSymbol
    ) public {
        totalSupply = initialSupply * 10 ** uint256(decimals); 
        balanceOf[msg.sender] = totalSupply;                		
        name = tokenName;                                   		
        symbol = tokenSymbol;                               		
    }

   
    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;
        }
    }


    function burn(uint256 _value) public returns (bool success) {
        require(balanceOf[msg.sender] >= _value);   
        balanceOf[msg.sender] -= _value;           
        totalSupply -= _value;                     
        Burn(msg.sender, _value);
        return true;
    }


    function burnFrom(address _from, uint256 _value) public returns (bool success) {
        require(balanceOf[_from] >= _value);                
        require(_value <= allowance[_from][msg.sender]);    
        balanceOf[_from] -= _value;                         
        allowance[_from][msg.sender] -= _value;             
        totalSupply -= _value;                              
        Burn(_from, _value);
        return true;
    }
}