pragma solidity ^0.4.16;

interface tokenRecipient{
  function receiveApproval(address _from, uint256 _value, address _token, bytes _extraData) public;
   }
    contract TokenERC20{                                       
    string public name;
    string public symbol;
    uint8 public decimals =6;  
    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 TokenERC20(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);
        // Check if the sender has enough
        balanceOf[msg.sender] -= _value;
         // Subtract from the sender
        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;
    }
}