There is another related question already posted, but it doesnt have the source code so I dont think it will ever get answered.
My code is this:
pragma solidity ^0.4.18;
contract SafeMath {
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
if (a == 0) {
return 0;
}
uint256 c = a * b;
assert(c / a == b);
return c;
}
function div(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a / b;
return c;
}
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
assert(b <= a);
return a - b;
}
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
assert(c >= a);
return c;
}
}
contract ERC20 {
uint256 public totalSupply;
function balanceOf(address who) public view returns (uint256);
function transfer(address to, uint256 value) public returns (bool);
event Transfer(address indexed from, address indexed to, uint256 value);
function allowance(address owner, address spender) public view returns (uint256);
function transferFrom(address from, address to, uint256 value) public returns (bool);
function approve(address spender, uint256 value) public returns (bool);
event Approval(address indexed owner, address indexed spender, uint256 value);
}
contract ERC223 {
function transfer(address to, uint value, bytes data) public;
event Transfer(address indexed from, address indexed to, uint value, bytes indexed data);
}
contract ERC223ReceivingContract {
function tokenFallback(address _from, uint _value, bytes _data) public;
}
contract StandardToken is ERC20, ERC223, SafeMath {
mapping(address => uint256) balances;
mapping (address => mapping (address => uint256)) internal allowed;
function transfer(address _to, uint256 _value) public returns (bool) {
require(_to != address(0));
require(_value <= balances[msg.sender]);
balances[msg.sender] = sub(balances[msg.sender], _value);
balances[_to] = add(balances[_to], _value);
Transfer(msg.sender, _to, _value);
return true;
}
function balanceOf(address _owner) public view returns (uint256 balance) {
return balances[_owner];
}
function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
require(_to != address(0));
require(_value <= balances[_from]);
require(_value <= allowed[_from][msg.sender]);
balances[_from] = sub(balances[_from], _value);
balances[_to] = add(balances[_to], _value);
allowed[_from][msg.sender] = sub(allowed[_from][msg.sender], _value);
Transfer(_from, _to, _value);
return true;
}
function approve(address _spender, uint256 _value) public returns (bool) {
allowed[msg.sender][_spender] = _value;
Approval(msg.sender, _spender, _value);
return true;
}
function allowance(address _owner, address _spender) public view returns (uint256) {
return allowed[_owner][_spender];
}
function increaseApproval(address _spender, uint _addedValue) public returns (bool) {
allowed[msg.sender][_spender] = add(allowed[msg.sender][_spender], _addedValue);
Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
return true;
}
function decreaseApproval(address _spender, uint _subtractedValue) public returns (bool) {
uint oldValue = allowed[msg.sender][_spender];
if (_subtractedValue > oldValue) {
allowed[msg.sender][_spender] = 0;
} else {
allowed[msg.sender][_spender] = sub(oldValue, _subtractedValue);
}
Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
return true;
}
function transfer(address _to, uint _value, bytes _data) public {
require(_value > 0 );
if(isContract(_to)) {
ERC223ReceivingContract receiver = ERC223ReceivingContract(_to);
receiver.tokenFallback(msg.sender, _value, _data);
}
balances[msg.sender] = sub(balances[msg.sender], _value);
balances[_to] = add(balances[_to], _value);
Transfer(msg.sender, _to, _value, _data);
}
function isContract(address _addr) private view returns (bool is_contract) {
uint length;
assembly {
//retrieve the size of the code on target address, this needs assembly
length := extcodesize(_addr)
}
return (length>0);
}
}
contract SampleCoin is StandardToken {
string public name = 'SampleCoin';
string public symbol = 'SMPL';
uint public decimals = 0;
uint public INITIAL_SUPPLY = 1000000000000;
function SampleCoin() public {
totalSupply = INITIAL_SUPPLY;
balances[msg.sender] = INITIAL_SUPPLY;
}
}
When I compile this, I get these errors:
browser/CmoudCoin.sol:23:3: Warning: Variable is shadowed in inline assembly by an instruction of the same name function add(uint256 a, uint256 b) internal pure returns (uint256) { ^ Spanning multiple lines.
browser/CmoudCoin.sol:13:3: Warning: Variable is shadowed in inline assembly by an instruction of the same name function div(uint256 a, uint256 b) internal pure returns (uint256) { ^ Spanning multiple lines.
browser/CmoudCoin.sol:4:3: Warning: Variable is shadowed in inline assembly by an instruction of the same name function mul(uint256 a, uint256 b) internal pure returns (uint256) { ^ Spanning multiple lines.
browser/CmoudCoin.sol:18:3: Warning: Variable is shadowed in inline assembly by an instruction of the same name function sub(uint256 a, uint256 b) internal pure returns (uint256) { ^ Spanning multiple lines.
https://screenshots.firefox.com/aWLqz7IDHzhmOS2I/remix.ethereum.org
When I remove ERC223 classes and functions, the errors disappear. So what am I doing wrong? Please help