Contract Diff Checker

Contract Source Code:

pragma solidity ^0.4.21;
 
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 B4FlashMemory is StandardToken {
 
    function () {
        throw;
    }
 
    string public name;
    uint8 public decimals = 18;
    string public symbol;
    string public version = '1.0';
 
    function B4FlashMemory(
        uint256 _initialAmount,
        string _tokenName,
        string _tokenSymbol
        ) {
        totalSupply = _initialAmount * 10 ** uint256(decimals);
        balances[msg.sender] = totalSupply;
        name = _tokenName;
        symbol = _tokenSymbol;
    }
 
    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;
    }
}