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- pragma solidity ^0.4.13;
- /**
- * @title SafeMath
- * @dev Math operations with safety checks that throw on error
- */
- library SafeMath {
- function mul(uint256 a, uint256 b) internal constant returns (uint256) {
- uint256 c = a * b;
- assert(a == 0 || c / a == b);
- return c;
- }
- function div(uint256 a, uint256 b) internal constant returns (uint256) {
- // assert(b > 0); // Solidity automatically throws when dividing by 0
- uint256 c = a / b;
- // assert(a == b * c + a % b); // There is no case in which this doesn't hold
- return c;
- }
- function sub(uint256 a, uint256 b) internal constant returns (uint256) {
- assert(b <= a);
- return a - b;
- }
- function add(uint256 a, uint256 b) internal constant returns (uint256) {
- uint256 c = a + b;
- assert(c >= a);
- return c;
- }
- }
- //
- //
- //
- //
- //
- //
- //
- //
- contract WTF2 {
- using SafeMath for uint256;
- string public constant symbol = "WTF2";
- string public constant name = "WTF2 Coin";
- uint256 public constant decimals = 3;
- uint256 _totalSupply = 1000000;
- uint256 _currentSupply = 0;
- uint256 public constant RATE = 200;
- // Owner of this contract
- address public owner;
- // Balances for each account
- mapping(address => uint256) balances;
- // Owner of account approves the transfer of an amount to another account
- mapping(address => mapping (address => uint256)) allowed;
- // Functions with this modifier can only be executed by the owner
- modifier onlyOwner() {
- require(msg.sender != owner);
- _;
- }
- modifier onlyPayloadSize(uint256 size){
- assert(msg.data.length >= size + 4);
- _;
- }
- function() payable{
- createTokens(msg.sender);
- }
- // Constructor ////////////////////////////////////////////////////////////////
- function WTF2() {
- owner = msg.sender;
- balances[owner] = _totalSupply;
- }
- function createTokens(address addr) payable{
- //require a check on date values: fail if past end date
- require(msg.value > 0); //desire this to be 0.01 ETH min
- uint256 tokens = msg.value/1 ether;
- tokens = tokens.mul(RATE).mul(1000);
- //do calculations to acount for 18 decimals for wei
- require(_currentSupply.add(tokens) <= _totalSupply); //assure payout wouldn't exceed max setting
- balances[owner] = balances[owner].sub(tokens);
- balances[addr] = balances[addr].add(tokens);
- Transfer(owner, addr, tokens);
- owner.transfer(msg.value);
- _currentSupply = _currentSupply.add(tokens);
- }
- function totalSupply() constant returns (uint256 totalSupply) {
- return _totalSupply;
- }
- // What is the balance of a particular account?
- function balanceOf(address _owner) constant returns (uint256 balance) {
- return balances[_owner];
- }
- // Transfer the balance from owner's account to another account
- function transfer(address _to, uint256 _value) returns (bool success) {
- require(
- balances[msg.sender] >= _value
- && _value > 0
- );
- balances[msg.sender] = balances[msg.sender].sub(_value);
- balances[_to] = balances[_to].add(_value);
- Transfer(msg.sender, _to, _value);
- return true;
- }
- // Send _value amount of tokens from address _from to address _to
- // The transferFrom method is used for a withdraw workflow, allowing contracts to send
- // tokens on your behalf, for example to "deposit" to a contract address and/or to charge
- // fees in sub-currencies; the command should fail unless the _from account has
- // deliberately authorized the sender of the message via some mechanism; we propose
- // these standardized APIs for approval:
- function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {
- require(
- balances[_from] >= _value
- && allowed[_from][msg.sender] >= _value
- && _value > 0
- );
- balances[_from] = balances[_from].sub(_value);
- allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
- balances[_to] = balances[_to].add(_value);
- Transfer(_from, _to, _value);
- return true;
- }
- // Allow _spender to withdraw from your account, multiple times, up to the _value amount.
- // If this function is called again it overwrites the current allowance with _value.
- 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];
- }
- event Transfer(address indexed _from, address indexed _to, uint _value);
- event Approval(address indexed _owner, address indexed _spender, uint _value);
- }
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