import "./Token"; contract ExampleToken is Token { uint256 tokenSupply; mapping (address => uint256) balances; mapping (address => mapping (address => uint256)) approvedTransfers; function ExampleToken(address _initialOwner, uint256 _supply) { tokenSupply = _supply; balances[_initialOwner] = _supply; } function totalSupply() constant returns (uint256 supply) { return tokenSupply; } function balanceOf(address _owner) constant returns (uint256 balance) { return balances[_owner]; } function transfer(address _to, uint256 _value) returns (bool success) { if (balances[msg.sender] >= _value) { 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 (approvedTransfers[_from][msg.sender] >= _value) { approvedTransfers[_from][msg.sender] -= _value; balances[_to] += _value; Transfer(_from, _to, _value); return true; } else { return false; } } function approve(address _spender, uint256 _value) returns (bool success) { approvedTransfers[msg.sender][_spender] = _value; Approval(msg.sender, _spender, _value); return true; } function allowance(address _owner, address _spender) constant returns (uint256 remaining) { return approvedTransfers[_owner][_spender]; } }