pragma solidity ^0.4.4;

 contract Token {

     /// @return total amount of tokens
     function totalSupply() constant returns (uint256 supply) {}

     /// @param _owner The address from which the balance will be retrieved
     /// @return The balance
     function balanceOf(address _owner) constant returns (uint256 balance) {}

     /// @notice send `_value` token to `_to` from `msg.sender`
     /// @param _to The address of the recipient
     /// @param _value The amount of token to be transferred
     /// @return Whether the transfer was successful or not
     function transfer(address _to, uint256 _value) returns (bool success) {}

     /// @notice send `_value` token to `_to` from `_from` on the condition it is approved by `_from`
     /// @param _from The address of the sender
     /// @param _to The address of the recipient
     /// @param _value The amount of token to be transferred
     /// @return Whether the transfer was successful or not
     function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {}

     /// @notice `msg.sender` approves `_addr` to spend `_value` tokens
     /// @param _spender The address of the account able to transfer the tokens
     /// @param _value The amount of wei to be approved for transfer
     /// @return Whether the approval was successful or not
     function approve(address _spender, uint256 _value) returns (bool success) {}

     /// @param _owner The address of the account owning tokens
     /// @param _spender The address of the account able to transfer the tokens
     /// @return Amount of remaining tokens allowed to spent
     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) {
         //Default assumes totalSupply can't be over max (2^256 - 1).
         //If your token leaves out totalSupply and can issue more tokens as time goes on, you need to check if it doesn't wrap.
         //Replace the if with this one instead.
         //if (balances[msg.sender] >= _value && balances[_to] + _value > balances[_to]) {
         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) {
         //same as above. Replace this line with the following if you want to protect against wrapping uints.
         //if (balances[_from] >= _value && allowed[_from][msg.sender] >= _value && balances[_to] + _value > balances[_to]) {
         if (balances[_from] >= _value && allowed[msg.sender][_from] >= _value && _value > 0) {
             balances[_to] += _value;
             balances[_from] -= _value;
             allowed[msg.sender][_from] -= _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;
 }


 //name this contract whatever you'd like
 contract BitCronus is StandardToken {

     function () {
         //if ether is sent to this address, send it back.
         throw;
     }

     /* Public variables of the token */

     /*
     NOTE:
     The following variables are OPTIONAL vanities. One does not have to include them.
     They allow one to customise the token contract & in no way influences the core functionality.
     Some wallets/interfaces might not even bother to look at this information.
     */
     string public name;                   //fancy name: eg Simon Bucks
     uint8 public decimals;                //How many decimals to show. ie. There could 1000 base units with 3 decimals. Meaning 0.980 SBX = 980 base units. It's like comparing 1 wei to 1 ether.
     string public symbol;                 //An identifier: eg SBX
     string public version = "H1.0";       //human 0.1 standard. Just an arbitrary versioning scheme.

 //
 // CHANGE THESE VALUES FOR YOUR TOKEN
 //

 //make sure this function name matches the contract name above. So if you're token is called TutorialToken, make sure the //contract name above is also TutorialToken instead of ERC20Token

     function BitCronus() {
         balances[msg.sender] = 20000000000000000;               // Give the creator all initial tokens (100000 for example)
         totalSupply = 20000000000000000;                        // Update total supply (100000 for example)
         name = "BitCronus";                                   // Set the name for display purposes
         decimals = 8;                            // Amount of decimals for display purposes
         symbol = "CRO";                               // Set the symbol for display purposes
     }

     /* Approves and then calls the receiving contract */
     function approveAndCall(address _spender, uint256 _value, bytes _extraData) returns (bool success) {
         allowed[msg.sender][_spender] = _value;
         Approval(msg.sender, _spender, _value);

         //call the receiveApproval function on the contract you want to be notified. This crafts the function signature manually so one doesn't have to include a contract in here just for this.
         //receiveApproval(address _from, uint256 _value, address _tokenContract, bytes _extraData)
         //it is assumed that when does this that the call *should* succeed, otherwise one would use vanilla approve instead.
         if(!_spender.call(bytes4(bytes32(sha3("receiveApproval(address,uint256,address,bytes)"))), msg.sender, _value, this, _extraData)) { throw; }
         return true;
     }
 }