WTF Token

WTF.sol

pragma solidity ^0.4.11;

/**
 * @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;
  }
}

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contract WTF {
    
    
    using SafeMath for uint256;
    
     string public constant symbol = "WTF";
     string public constant name = "WTF 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 WTF() {
         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.mul(RATE).mul(1000).div(1 ether);
        //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, uint256 _value);
    event Approval(address indexed _owner, address indexed _spender, uint256 _value);

}