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/ballot.sol
Created Dec 15, 2016

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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-v0.4.7+commit.822622cf.js&optimize=undefined&gist=
pragma solidity ^0.4.6;
contract owned {
address public owner;
function owned() {
owner = msg.sender;
}
modifier onlyOwner {
if (msg.sender != owner) throw;
_;
}
function transferOwnership(address newOwner) onlyOwner {
owner = newOwner;
}
}
contract tokenRecipient { function receiveApproval(address _from, uint256 _value, address _token, bytes _externalData);}
contract token {
mapping (address => uint256) public balanceOf;
mapping (address => mapping (address => uint256)) public allowance;
uint256 public totalSupply;
string public name;
uint8 public decimals;
string public symbol;
event Transfer(address indexed from, address indexed to, uint256 value);
function token(uint256 initialSupply, string tokenName, uint8 decimalUnits, string tokenSymbol) {
balanceOf[msg.sender] = initialSupply;
totalSupply = initialSupply;
decimals = decimalUnits;
symbol = tokenSymbol;
name = tokenName;
}
function transfer(address _to, uint256 _value) {
if(balanceOf[msg.sender] < _value) throw;
if(balanceOf[_to] + _value < balanceOf[_to]) throw;
balanceOf[_to] += _value;
balanceOf[msg.sender] -= _value;
Transfer(msg.sender, _to, _value);
}
function approve(address _spender, uint256 _value) returns (bool success) {
allowance[msg.sender][_spender] = _value;
tokenRecipient spender = tokenRecipient(_spender);
return true;
}
function approveAndCall(address _spender, uint256 _value, bytes _extraData)
returns (bool success) {
tokenRecipient spender = tokenRecipient(_spender);
if (approve(_spender, _value)) {
spender.receiveApproval(_spender, _value, this, _extraData);
return true;
}
}
function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {
if(balanceOf[_from] < _value) throw;
if(balanceOf[_to] + _value < balanceOf[_to]) throw;
if(_value > allowance[_from][msg.sender]) throw;
balanceOf[_from] -= _value;
balanceOf[_to] += _value;
allowance[_from][msg.sender] -= _value;
Transfer(_from, _to, _value);
return true;
}
function() {
throw;
}
}
contract MyAdvancedToken is owned, token {
uint256 public sellPrice;
uint256 public buyPrice;
uint256 public totalSupply;
mapping (address => bool) public frozenAccount;
event FrozenFunds(address target, bool frozen);
function MyAdvancedToken(uint256 initialSupply, string tokenName, uint8 decimalUnits,
string tokenSymbol, address centralMiner) token (initialSupply, tokenName, decimalUnits, tokenSymbol) {
if(centralMiner != 0) owner = centralMiner;
balanceOf[owner] = initialSupply;
}
function transfer(address _to, uint256 _value) {
if (balanceOf[msg.sender] < _value) throw;
if (balanceOf[_to] + _value < balanceOf[_to]) throw;
if (frozenAccount[msg.sender]) throw;
balanceOf[msg.sender] -= _value;
balanceOf[_to] += _value;
Transfer(msg.sender, _to, _value);
}
function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {
if (balanceOf[_from] < _value) throw;
if (balanceOf[_to] + _value < balanceOf[_to]) throw;
if (frozenAccount[_from]) throw;
if (_value > allowance[_from][msg.sender]) throw;
balanceOf[_from] -= _value;
balanceOf[_to] += _value;
allowance[_from][msg.sender] -= _value;
Transfer(_from, _to, _value);
return true;
}
function mintToken(address target, uint256 mintedAmount) onlyOwner {
balanceOf[target] += mintedAmount;
totalSupply += mintedAmount;
Transfer(0, this, mintedAmount);
Transfer(this, target, mintedAmount);
}
function freezeAccount(address target, bool freeze) {
frozenAccount[target] = freeze;
FrozenFunds(target, freeze);
}
function setPrices(uint256 newSellPrice, uint256 newBuyPrice) onlyOwner {
sellPrice = newSellPrice;
buyPrice = newBuyPrice;
}
function buy() payable {
uint amount = msg.value/buyPrice;
if (balanceOf[this] < amount) throw;
balanceOf[msg.sender] += amount;
balanceOf[this] -= amount;
Transfer(this, msg.sender, amount);
}
function sell(uint256 amount) payable {
if (balanceOf[msg.sender] < amount) throw;
balanceOf[msg.sender] -= amount;
balanceOf[this] += amount;
if(!msg.sender.send(amount * sellPrice)) {
throw;
} else {
Transfer(msg.sender, this, amount);
}
}
}
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