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@pcncoin /PCNC
Created Jun 24, 2018

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pragma solidity ^0.4.12;
/**
* @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;
}
}
/**
* @title Ownable
* @dev The Ownable contract has an owner address, and provides basic authorization control
* functions, this simplifies the implementation of "user permissions".
*/
contract Ownable {
address public owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev The Ownable constructor sets the original `owner` of the contract to the sender
* account.
*/
function Ownable() {
owner = msg.sender;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(msg.sender == owner);
_;
}
/**
* @dev Allows the current owner to transfer control of the contract to a newOwner.
* @param newOwner The address to transfer ownership to.
*/
function transferOwnership(address newOwner) onlyOwner public {
require(newOwner != address(0));
OwnershipTransferred(owner, newOwner);
owner = newOwner;
}
}
/**
* @title ERC20Basic
* @dev Simpler version of ERC20 interface
* @dev see https://github.com/ethereum/EIPs/issues/179
*/
contract ERC20Basic {
uint256 public totalSupply;
function balanceOf(address who) public constant returns (uint256);
function transfer(address to, uint256 value) public returns (bool);
event Transfer(address indexed from, address indexed to, uint256 value);
}
/**
* @title Basic token
* @dev Basic version of StandardToken, with no allowances.
*/
contract BasicToken is ERC20Basic {
using SafeMath for uint256;
mapping(address => uint256) balances;
/**
* @dev transfer token for a specified address
* @param _to The address to transfer to.
* @param _value The amount to be transferred.
*/
function transfer(address _to, uint256 _value) public returns (bool) {
require(_to != address(0));
// SafeMath.sub will throw if there is not enough balance.
balances[msg.sender] = balances[msg.sender].sub(_value);
balances[_to] = balances[_to].add(_value);
Transfer(msg.sender, _to, _value);
return true;
}
/**
* @dev Gets the balance of the specified address.
* @param _owner The address to query the the balance of.
* @return An uint256 representing the amount owned by the passed address.
*/
function balanceOf(address _owner) public constant returns (uint256 balance) {
return balances[_owner];
}
}
/**
* @title ERC20 interface
* @dev see https://github.com/ethereum/EIPs/issues/20
*/
contract ERC20 is ERC20Basic {
function allowance(address owner, address spender) public constant returns (uint256);
function transferFrom(address from, address to, uint256 value) public returns (bool);
function approve(address spender, uint256 value) public returns (bool);
event Approval(address indexed owner, address indexed spender, uint256 value);
}
/**
* @title Standard ERC20 token
*
* @dev Implementation of the basic standard token.
* @dev https://github.com/ethereum/EIPs/issues/20
* @dev Based on code by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
*/
contract StandardToken is ERC20, BasicToken {
mapping (address => mapping (address => uint256)) allowed;
/**
* @dev Transfer tokens from one address to another
* @param _from address The address which you want to send tokens from
* @param _to address The address which you want to transfer to
* @param _value uint256 the amount of tokens to be transferred
*/
function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
require(_to != address(0));
uint256 _allowance = allowed[_from][msg.sender];
// Check is not needed because sub(_allowance, _value) will already throw if this condition is not met
// require (_value <= _allowance);
balances[_from] = balances[_from].sub(_value);
balances[_to] = balances[_to].add(_value);
allowed[_from][msg.sender] = _allowance.sub(_value);
Transfer(_from, _to, _value);
return true;
}
/**
* @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
*
* Beware that changing an allowance with this method brings the risk that someone may use both the old
* and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this
* race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
* @param _spender The address which will spend the funds.
* @param _value The amount of tokens to be spent.
*/
function approve(address _spender, uint256 _value) public returns (bool) {
allowed[msg.sender][_spender] = _value;
Approval(msg.sender, _spender, _value);
return true;
}
/**
* @dev Function to check the amount of tokens that an owner allowed to a spender.
* @param _owner address The address which owns the funds.
* @param _spender address The address which will spend the funds.
* @return A uint256 specifying the amount of tokens still available for the spender.
*/
function allowance(address _owner, address _spender) public constant returns (uint256 remaining) {
return allowed[_owner][_spender];
}
/**
* approve should be called when allowed[_spender] == 0. To increment
* allowed value is better to use this function to avoid 2 calls (and wait until
* the first transaction is mined)
* From MonolithDAO Token.sol
*/
function increaseApproval (address _spender, uint _addedValue)
returns (bool success) {
allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);
Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
return true;
}
function decreaseApproval (address _spender, uint _subtractedValue)
returns (bool success) {
uint oldValue = allowed[msg.sender][_spender];
if (_subtractedValue > oldValue) {
allowed[msg.sender][_spender] = 0;
} else {
allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
}
Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
return true;
}
}
/**
* @title Burnable Token
* @dev Token that can be irreversibly burned (destroyed).
*/
contract BurnableToken is StandardToken {
event Burn(address indexed burner, uint256 value);
/**
* @dev Burns a specific amount of tokens.
* @param _value The amount of token to be burned.
*/
function burn(uint256 _value) public {
require(_value > 0);
require(_value <= balances[msg.sender]);
// no need to require value <= totalSupply, since that would imply the
// sender's balance is greater than the totalSupply, which *should* be an assertion failure
address burner = msg.sender;
balances[burner] = balances[burner].sub(_value);
totalSupply = totalSupply.sub(_value);
Burn(burner, _value);
Transfer(burner, address(0), _value);
}
}
contract PCNCoin is BurnableToken, Ownable {
string public constant name = "PCN Coin";
string public constant symbol = "PCNC";
uint public constant decimals = 18;
// there is no problem in using * here instead of .mul()
uint256 public constant initialSupply = 900000000 * (10 ** uint256(decimals));
// Constructors
function PCNCoin () {
totalSupply = initialSupply;
balances[msg.sender] = initialSupply; // Send all tokens to owner
}
}
/**
* @title Crowdsale
* @dev Crowdsale is a base contract for managing a token crowdsale.
* Crowdsales have a start and end timestamps, where investors can make
* token purchases and the crowdsale will assign them tokens based
* on a token per ETH rate. Funds collected are forwarded
to a wallet
* as they arrive.
*/
contract token { function transfer(address receiver, uint amount){ } }
contract PCNCrowdsale is PCNCoin {
using SafeMath for uint256;
// uint256 durationInMinutes;
// address where funds are collected
// address public wallet;
// token address
// address public addressOfTokenUsedAsReward;
uint256 public price = 3000;
token tokenReward;
// mapping (address => uint) public contributions;
// start and end timestamps where investments are allowed (both inclusive)
// uint256 public startTime;
// uint256 public endTime;
// amount of raised money in wei
uint256 public weiRaised;
/**
* event for token purchase logging
* @param purchaser who paid for the tokens
* @param beneficiary who got the tokens
* @param value weis paid for purchase
* @param amount amount of tokens purchased
*/
event TokenPurchase(address indexed purchaser, address indexed beneficiary, uint256 value, uint256 amount);
function PCNCrowdsale () {
//You will change this to your wallet where you need the ETH
// wallet = 0x5daaAb630673a61f487965f90E13457a74F566D3;
// durationInMinutes = _durationInMinutes;
//Here will come the checksum address we got
// addressOfTokenUsedAsReward = 0x8aB10a31c97Af458Db24038Ed8b498590cf64d74;
tokenReward = token(address(this));
}
bool public started = true;
function startSale() onlyOwner {
// if (msg.sender != wallet) throw;
started = true;
}
function stopSale() onlyOwner {
// if(msg.sender != wallet) throw;
started = false;
}
function setPrice(uint256 _price) onlyOwner {
// if(msg.sender != wallet) throw;
price = _price;
}
// fallback function can be used to buy tokens
function () payable {
buyTokens(msg.sender);
}
// low level token purchase function
function buyTokens(address beneficiary) payable {
require(beneficiary != 0x0);
require(validPurchase());
uint256 weiAmount = msg.value;
// if(weiAmount < 10**16) throw;
// if(weiAmount > 50*10**18) throw;
// calculate token amount to be sent
uint256 tokens = (weiAmount) * price;//weiamount * price
// uint256 tokens = (weiAmount/10**(18-decimals)) * price;//weiamount * price
// update state
weiRaised = weiRaised.add(weiAmount);
// if(contributions[msg.sender].add(weiAmount)>10*10**18) throw;
// contributions[msg.sender] = contributions[msg.sender].add(weiAmount);
tokenReward.transfer(beneficiary, tokens);
TokenPurchase(msg.sender, beneficiary, weiAmount, tokens);
forwardFunds();
}
// send ether to the fund collection wallet
// override to create custom fund forwarding mechanisms
function forwardFunds() internal {
// wallet.transfer(msg.value);
if (!owner.send(msg.value)) {
throw;
}
}
// @return true if the transaction can buy tokens
function validPurchase() internal constant returns (bool) {
bool withinPeriod = started;
bool nonZeroPurchase = msg.value != 0;
return withinPeriod && nonZeroPurchase;
}
function withdrawTokens(uint256 _amount) onlyOwner {
// if(msg.sender!=wallet) throw;
tokenReward.transfer(owner,_amount);
}
}
@kiyoshi945

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@Sonmep

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Sonmep commented Jun 30, 2018

good project

@Achsir9

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Achsir9 commented Jul 2, 2018

Together we reach success in PCNCOIN
https://pcncoin.com/referral/nicekiss

@baobao688

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baobao688 commented Jul 2, 2018

ok đấy - rất tiềm năng 👍

@Jaysims1

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Jaysims1 commented Jul 30, 2018

Great project

@demren

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demren commented Aug 9, 2018

Best project

@kuryliuk

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kuryliuk commented Sep 21, 2018

Hello.
Super.

@ferhatzehra

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ferhatzehra commented Oct 12, 2018

iyi güzel proje

@Adelinojunior11

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Adelinojunior11 commented Nov 15, 2018

Excelent project. congratulations!!!

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