// Vulnerability label: overflow
pragma solidity ^0.4.20;

contract Token {



    function totalSupply() constant returns (uint256 supply) {}



    function balanceOf(address _owner) constant returns (uint256 balance) {}



    function transfer(address _to, uint256 _value) returns (bool success) {}


    function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {}


    function approve(address _spender, uint256 _value) returns (bool success) {}


  

    function allowance(address _owner, address _spender) constant returns (uint256 remaining) {}


    event Transfer(address indexed _from, address indexed _to, uint256 _value);

    event Approval(address indexed _owner, address indexed _spender, uint256 _value);


}


contract StandardToken is Token {


    function transfer(address _to, uint256 _value) returns (bool success) {


        if (balances[msg.sender] >= _value && _value > 0) {

            balances[msg.sender] -= _value;

            balances[_to] += _value;

            Transfer(msg.sender, _to, _value);

            return true;

        } else { return false; }

    }


    function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {

      
        if (balances[_from] >= _value && allowed[_from][msg.sender] >= _value && _value > 0) {

            balances[_to] += _value;

            balances[_from] -= _value;

            allowed[_from][msg.sender] -= _value;

            Transfer(_from, _to, _value);

            return true;

        } else { return false; }

    }


    function balanceOf(address _owner) constant returns (uint256 balance) {

        return balances[_owner];

    }


    function approve(address _spender, uint256 _value) returns (bool success) {

        allowed[msg.sender][_spender] = _value;

        Approval(msg.sender, _spender, _value);

        return true;

    }


    function allowance(address _owner, address _spender) constant returns (uint256 remaining) {

      return allowed[_owner][_spender];

    }


    mapping (address => uint256) balances;

    mapping (address => mapping (address => uint256)) allowed;

    uint256 public totalSupply;

}




contract ERC20Token is StandardToken {


    function () {

      

        throw;

    }



    string public name;                   //fancy name: eg Simon Bucks

    uint8 public decimals;                //How many decimals to show. ie. There could 1000 base units with 3 decimals. Meaning 0.980 SBX = 980 base units. It's like comparing 1 wei to 1 ether.

    string public symbol;                 //An identifier: eg SBX

    string public version = 'H1.0';       //human 0.1 standard. Just an arbitrary versioning scheme.



    function ERC20Token(

        ) {

        balances[msg.sender] = 100000000000;               // Give the creator all initial tokens (100000 for example)

        totalSupply = 100000000000;                        // Update total supply (100000 for example)

        name = "Loopex Token";                                   // Set the name for display purposes

        decimals = 2;                            // Amount of decimals for display purposes

        symbol = "XLP";                               // Set the symbol for display purposes

    }



    function approveAndCall(address _spender, uint256 _value, bytes _extraData) returns (bool success) {

        allowed[msg.sender][_spender] = _value;

        Approval(msg.sender, _spender, _value);



        if(!_spender.call(bytes4(bytes32(sha3("receiveApproval(address,uint256,address,bytes)"))), msg.sender, _value, this, _extraData)) { throw; }

        return true;

    }

}