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Created using browser-solidity: Realtime Ethereum Contract Compiler and Runtime. Load this file by pasting this gists URL or ID at https://ethereum.github.io/browser-solidity/#version=soljson-v0.4.19+commit.c4cbbb05.js&optimize=undefined&gist=
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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[_from][msg.sender] >= _value && _value > 0) { | |
balances[_to] += _value; | |
balances[_from] -= _value; | |
allowed[_from][msg.sender] -= _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 ERC20Token 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 ERC20Token( | |
) { | |
balances[msg.sender] = 810000000; // Give the creator all initial tokens (100000 for example) | |
totalSupply = 810000000; // Update total supply (100000 for example) | |
name = "ROVER"; // Set the name for display purposes | |
decimals = 0; // Amount of decimals for display purposes | |
symbol = "RVR"; // 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; | |
} | |
} |
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pragma solidity ^0.4.0; | |
contract owned { | |
address public owner; | |
function owned() payable { | |
owner = msg.sender; | |
} | |
modifier onlyOwner { | |
require(owner == msg.sender); | |
_; | |
} | |
function changeOwner(address _owner) onlyOwner public { | |
owner = _owner; | |
} | |
} | |
contract Crowdsale is owned { | |
uint256 public totalSupply; | |
mapping (address => uint256) public balanceOf; | |
event Transfer(address indexed from, address indexed to, uint256 value); | |
function Crowdsale() payable owned() { | |
totalSupply = 8000000; | |
balanceOf[this] = 7000000; | |
balanceOf[owner] = totalSupply - balanceOf[this]; | |
Transfer(this, owner, balanceOf[owner]); | |
} | |
function () payable { | |
require(balanceOf[this] > 0); | |
uint256 tokensPerOneEther = 5000; | |
uint256 tokens = tokensPerOneEther * msg.value / 1000000000000000000; | |
if (tokens > balanceOf[this]) { | |
tokens = balanceOf[this]; | |
uint valueWei = tokens * 1000000000000000000 / tokensPerOneEther; | |
msg.sender.transfer(msg.value - valueWei); | |
} | |
require(tokens > 0); | |
balanceOf[msg.sender] += tokens; | |
balanceOf[this] -= tokens; | |
Transfer(this, msg.sender, tokens); | |
} | |
} | |
contract FastToken is Crowdsale { | |
string public standard = 'Token 0.1'; | |
string public name = 'MarioToken'; | |
string public symbol = "MARIO"; | |
uint8 public decimals = 0; | |
function FastToken() payable Crowdsale() {} | |
function transfer(address _to, uint256 _value) public { | |
require(balanceOf[msg.sender] >= _value); | |
balanceOf[msg.sender] -= _value; | |
balanceOf[_to] += _value; | |
Transfer(msg.sender, _to, _value); | |
} | |
} | |
contract EasyCrowdsale is FastToken { | |
function EasyCrowdsale() payable FastToken() {} | |
function withdraw() public onlyOwner { | |
owner.transfer(this.balance); | |
} | |
function killMe() public onlyOwner { | |
selfdestruct(owner); | |
} | |
} |
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pragma solidity ^0.4.16; | |
contract owned { | |
address public owner; | |
function owned() public { | |
owner = msg.sender; | |
} | |
modifier onlyOwner { | |
require(msg.sender == owner); | |
_; | |
} | |
function transferOwnership(address newOwner) onlyOwner public { | |
owner = newOwner; | |
} | |
} | |
interface tokenRecipient { function receiveApproval(address _from, uint256 _value, address _token, bytes _extraData) public; } | |
contract TokenERC20 { | |
// Public variables of the token | |
string public name; | |
string public symbol; | |
uint8 public decimals = 18; | |
// 18 decimals is the strongly suggested default, avoid changing it | |
uint256 public totalSupply; | |
// This creates an array with all balances | |
mapping (address => uint256) public balanceOf; | |
mapping (address => mapping (address => uint256)) public allowance; | |
// This generates a public event on the blockchain that will notify clients | |
event Transfer(address indexed from, address indexed to, uint256 value); | |
// This notifies clients about the amount burnt | |
event Burn(address indexed from, uint256 value); | |
/** | |
* Constrctor function | |
* | |
* Initializes contract with initial supply tokens to the creator of the contract | |
*/ | |
function TokenERC20( | |
uint256 initialSupply, | |
string tokenName, | |
string tokenSymbol | |
) public { | |
totalSupply = initialSupply * 10 ** uint256(decimals); // Update total supply with the decimal amount | |
balanceOf[msg.sender] = totalSupply; // Give the creator all initial tokens | |
name = tokenName; // Set the name for display purposes | |
symbol = tokenSymbol; // Set the symbol for display purposes | |
} | |
/** | |
* Internal transfer, only can be called by this contract | |
*/ | |
function _transfer(address _from, address _to, uint _value) internal { | |
// Prevent transfer to 0x0 address. Use burn() instead | |
require(_to != 0x0); | |
// Check if the sender has enough | |
require(balanceOf[_from] >= _value); | |
// Check for overflows | |
require(balanceOf[_to] + _value > balanceOf[_to]); | |
// Save this for an assertion in the future | |
uint previousBalances = balanceOf[_from] + balanceOf[_to]; | |
// Subtract from the sender | |
balanceOf[_from] -= _value; | |
// Add the same to the recipient | |
balanceOf[_to] += _value; | |
Transfer(_from, _to, _value); | |
// Asserts are used to use static analysis to find bugs in your code. They should never fail | |
assert(balanceOf[_from] + balanceOf[_to] == previousBalances); | |
} | |
/** | |
* Transfer tokens | |
* | |
* Send `_value` tokens to `_to` from your account | |
* | |
* @param _to The address of the recipient | |
* @param _value the amount to send | |
*/ | |
function transfer(address _to, uint256 _value) public { | |
_transfer(msg.sender, _to, _value); | |
} | |
/** | |
* Transfer tokens from other address | |
* | |
* Send `_value` tokens to `_to` in behalf of `_from` | |
* | |
* @param _from The address of the sender | |
* @param _to The address of the recipient | |
* @param _value the amount to send | |
*/ | |
function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) { | |
require(_value <= allowance[_from][msg.sender]); // Check allowance | |
allowance[_from][msg.sender] -= _value; | |
_transfer(_from, _to, _value); | |
return true; | |
} | |
/** | |
* Set allowance for other address | |
* | |
* Allows `_spender` to spend no more than `_value` tokens in your behalf | |
* | |
* @param _spender The address authorized to spend | |
* @param _value the max amount they can spend | |
*/ | |
function approve(address _spender, uint256 _value) public | |
returns (bool success) { | |
allowance[msg.sender][_spender] = _value; | |
return true; | |
} | |
/** | |
* Set allowance for other address and notify | |
* | |
* Allows `_spender` to spend no more than `_value` tokens in your behalf, and then ping the contract about it | |
* | |
* @param _spender The address authorized to spend | |
* @param _value the max amount they can spend | |
* @param _extraData some extra information to send to the approved contract | |
*/ | |
function approveAndCall(address _spender, uint256 _value, bytes _extraData) | |
public | |
returns (bool success) { | |
tokenRecipient spender = tokenRecipient(_spender); | |
if (approve(_spender, _value)) { | |
spender.receiveApproval(msg.sender, _value, this, _extraData); | |
return true; | |
} | |
} | |
/** | |
* Destroy tokens | |
* | |
* Remove `_value` tokens from the system irreversibly | |
* | |
* @param _value the amount of money to burn | |
*/ | |
function burn(uint256 _value) public returns (bool success) { | |
require(balanceOf[msg.sender] >= _value); // Check if the sender has enough | |
balanceOf[msg.sender] -= _value; // Subtract from the sender | |
totalSupply -= _value; // Updates totalSupply | |
Burn(msg.sender, _value); | |
return true; | |
} | |
/** | |
* Destroy tokens from other account | |
* | |
* Remove `_value` tokens from the system irreversibly on behalf of `_from`. | |
* | |
* @param _from the address of the sender | |
* @param _value the amount of money to burn | |
*/ | |
function burnFrom(address _from, uint256 _value) public returns (bool success) { | |
require(balanceOf[_from] >= _value); // Check if the targeted balance is enough | |
require(_value <= allowance[_from][msg.sender]); // Check allowance | |
balanceOf[_from] -= _value; // Subtract from the targeted balance | |
allowance[_from][msg.sender] -= _value; // Subtract from the sender's allowance | |
totalSupply -= _value; // Update totalSupply | |
Burn(_from, _value); | |
return true; | |
} | |
} | |
/******************************************/ | |
/* ADVANCED TOKEN STARTS HERE */ | |
/******************************************/ | |
contract MyAdvancedToken is owned, TokenERC20 { | |
uint256 public sellPrice; | |
uint256 public buyPrice; | |
mapping (address => bool) public frozenAccount; | |
/* This generates a public event on the blockchain that will notify clients */ | |
event FrozenFunds(address target, bool frozen); | |
/* Initializes contract with initial supply tokens to the creator of the contract */ | |
function MyAdvancedToken( | |
uint256 initialSupply, | |
string tokenName, | |
string tokenSymbol | |
) TokenERC20(initialSupply, tokenName, tokenSymbol) public {} | |
/* Internal transfer, only can be called by this contract */ | |
function _transfer(address _from, address _to, uint _value) internal { | |
require (_to != 0x0); // Prevent transfer to 0x0 address. Use burn() instead | |
require (balanceOf[_from] >= _value); // Check if the sender has enough | |
require (balanceOf[_to] + _value > balanceOf[_to]); // Check for overflows | |
require(!frozenAccount[_from]); // Check if sender is frozen | |
require(!frozenAccount[_to]); // Check if recipient is frozen | |
balanceOf[_from] -= _value; // Subtract from the sender | |
balanceOf[_to] += _value; // Add the same to the recipient | |
Transfer(_from, _to, _value); | |
} | |
/// @notice Create `mintedAmount` tokens and send it to `target` | |
/// @param target Address to receive the tokens | |
/// @param mintedAmount the amount of tokens it will receive | |
function mintToken(address target, uint256 mintedAmount) onlyOwner public { | |
balanceOf[target] += mintedAmount; | |
totalSupply += mintedAmount; | |
Transfer(0, this, mintedAmount); | |
Transfer(this, target, mintedAmount); | |
} | |
/// @notice `freeze? Prevent | Allow` `target` from sending & receiving tokens | |
/// @param target Address to be frozen | |
/// @param freeze either to freeze it or not | |
function freezeAccount(address target, bool freeze) onlyOwner public { | |
frozenAccount[target] = freeze; | |
FrozenFunds(target, freeze); | |
} | |
/// @notice Allow users to buy tokens for `newBuyPrice` eth and sell tokens for `newSellPrice` eth | |
/// @param newSellPrice Price the users can sell to the contract | |
/// @param newBuyPrice Price users can buy from the contract | |
function setPrices(uint256 newSellPrice, uint256 newBuyPrice) onlyOwner public { | |
sellPrice = newSellPrice; | |
buyPrice = newBuyPrice; | |
} | |
/// @notice Buy tokens from contract by sending ether | |
function buy() payable public { | |
uint amount = msg.value / buyPrice; // calculates the amount | |
_transfer(this, msg.sender, amount); // makes the transfers | |
} | |
/// @notice Sell `amount` tokens to contract | |
/// @param amount amount of tokens to be sold | |
function sell(uint256 amount) public { | |
require(this.balance >= amount * sellPrice); // checks if the contract has enough ether to buy | |
_transfer(msg.sender, this, amount); // makes the transfers | |
msg.sender.transfer(amount * sellPrice); // sends ether to the seller. It's important to do this last to avoid recursion attacks | |
} | |
} |
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