@dev Math operations with safety checks that throw on error
*/
library SafeMath {
/**
@dev Multiplies two numbers, throws on overflow.
/
function mul(uint256 a, uint256 b) internal pure returns (uint256 c) {
if (a == 0) {
return 0;
}
c = a b;
assert(c / a == b);
return c;
}
/**
@dev Integer division of two numbers, truncating the quotient.
/
function div(uint256 a, uint256 b) internal pure 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 a / b;
}
/**
@dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
assert(b <= a);
return a - b;
}
/**
@dev Adds two numbers, throws on overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256 c) {
c = a + b;
assert(c >= a);
return c;
}
}
/**
@title ERC20Basic
@dev Simpler version of ERC20 interface
@dev see https://github.com/ethereum/EIPs/issues/179
*/
contract ERC20Basic {
function totalSupply() public view returns (uint256);
function balanceOf(address who) public view 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;
uint256 totalSupply_;
/**
@dev total number of tokens in existence
*/
function totalSupply() public view returns (uint256) {
return totalSupply_;
}
/**
@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));
require(_value <= balances[msg.sender]);
@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 view returns (uint256) {
return balances[_owner];
}
}
@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;
emit 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
view
returns (uint256)
{
return allowed[_owner][_spender];
}
/**
@dev Increase the amount of tokens that an owner allowed to a 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
@param _spender The address which will spend the funds.
@param _addedValue The amount of tokens to increase the allowance by.
*/
function increaseApproval(
address _spender,
uint _addedValue
)
public
returns (bool)
{
allowed[msg.sender][_spender] = (
allowed[msg.sender][_spender].add(_addedValue));
emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
return true;
}
/**
@dev Decrease the amount of tokens that an owner allowed to a spender.
approve should be called when allowed[_spender] == 0. To decrement
allowed value is better to use this function to avoid 2 calls (and wait until
the first transaction is mined)
From MonolithDAO Token.sol
@param _spender The address which will spend the funds.
@param _subtractedValue The amount of tokens to decrease the allowance by.
*/
function decreaseApproval(
address _spender,
uint _subtractedValue
)
public
returns (bool)
{
uint oldValue = allowed[msg.sender][_spender];
if (_subtractedValue > oldValue) {
allowed[msg.sender][_spender] = 0;
} else {
allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
}
emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
return true;
}
}
/**
@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;
@dev The Ownable constructor sets the original owner of the contract to the sender
account.
*/
constructor() public {
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) public onlyOwner {
require(newOwner != address(0));
emit OwnershipTransferred(owner, newOwner);
owner = newOwner;
}
}
/**
@title Mintable token
@dev Simple ERC20 Token example, with mintable token creation
@param _to The address that will receive the minted tokens.
@param _amount The amount of tokens to mint.
@return A boolean that indicates if the operation was successful.
*/
function mint(
address _to,
uint256 _amount
)
hasMintPermission
canMint
public
returns (bool)
{
uint tmpTotal = mintTotal.add(amount);
require(tmpTotal <= totalSupply);
mintTotal = mintTotal.add(_amount);
balances[_to] = balances[_to].add(_amount);
emit Mint(_to, _amount);
emit Transfer(address(0), _to, _amount);
return true;
}
}
/**
@title Pausable
@dev Base contract which allows children to implement an emergency stop mechanism.
*/
contract Pausable is Ownable {
event Pause();
event Unpause();
bool public paused = true;
/**
@dev Modifier to make a function callable only when the contract is not paused.
*/
modifier whenNotPaused() {
require(!paused);
_;
}
/**
@dev Modifier to make a function callable only when the contract is paused.
*/
modifier whenPaused() {
require(paused);
_;
}
/**
@dev called by the owner to pause, triggers stopped state
*/
function pause() onlyOwner whenNotPaused public {
paused = true;
emit Pause();
}
/**
@dev called by the owner to unpause, returns to normal state
*/
function unpause() onlyOwner whenPaused public {
paused = false;
emit Unpause();
}
}
/**
@title Pausable token
@dev StandardToken modified with pausable transfers.
**/
contract PausableToken is StandardToken, Pausable {
function transfer(
address _to,
uint256 _value
)
public
whenNotPaused
returns (bool)
{
return super.transfer(_to, _value);
}
function transferFrom(
address _from,
address _to,
uint256 _value
)
public
whenNotPaused
returns (bool)
{
return super.transferFrom(_from, _to, _value);
}
function approve(
address _spender,
uint256 _value
)
public
whenNotPaused
returns (bool)
{
return super.approve(_spender, _value);
}
function increaseApproval(
address _spender,
uint _addedValue
)
public
whenNotPaused
returns (bool success)
{
return super.increaseApproval(_spender, _addedValue);
}
function decreaseApproval(
address _spender,
uint _subtractedValue
)
public
whenNotPaused
returns (bool success)
{
return super.decreaseApproval(_spender, _subtractedValue);
}
}
contract Philcoin is PausableToken, MintableToken {
// public variables
string public name = "Philcoin";
string public symbol = "PHC";
uint8 public decimals = 9;
constructor() public {
totalSupply_ = 100000 * (10 ** uint256(decimals));
}
function () public payable {
revert();
}
Can some edit my contract.
I would like every transaction has a 10% tax -5 automatically burn -3 goes to wallet of everyone who holds token -2 to my selected wallet
Has a feature of reanounce and burn manually.
please help! Heres my contract
pragma solidity ^0.4.23;
// based on https://github.com/OpenZeppelin/openzeppelin-solidity/tree/v1.10.0 /**
@dev Math operations with safety checks that throw on error */ library SafeMath {
/**
/**
/**
/**
/**
/**
@dev Basic version of StandardToken, with no allowances. */ contract BasicToken is ERC20Basic { using SafeMath for uint256;
mapping(address => uint256) balances;
uint256 totalSupply_;
/**
/**
balances[msg.sender] = balances[msg.sender].sub(_value); balances[_to] = balances[_to].add(_value); emit Transfer(msg.sender, _to, _value); return true; }
/**
/**
@dev see https://github.com/ethereum/EIPs/issues/20 */ contract ERC20 is ERC20Basic { function allowance(address owner, address spender) public view 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 ); }
/**
@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)) internal allowed;
/**
balances[_from] = balances[_from].sub(_value); balances[_to] = balances[_to].add(_value); allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value); emit Transfer(_from, _to, _value); return true; }
/**
/**
/**
/**
}
/**
functions, this simplifies the implementation of "user permissions". */ contract Ownable { address public owner;
event OwnershipRenounced(address indexed previousOwner); event OwnershipTransferred( address indexed previousOwner, address indexed newOwner );
/**
owner
of the contract to the sender/**
/**
/**
Based on code by TokenMarketNet: https://github.com/TokenMarketNet/ico/blob/master/contracts/MintableToken.sol */ contract MintableToken is StandardToken, Ownable { event Mint(address indexed to, uint256 amount);
bool public mintingFinished = false; uint public mintTotal = 0;
modifier canMint() { require(!mintingFinished); _; }
modifier hasMintPermission() { require(msg.sender == owner); _; }
/**
/**
@dev Base contract which allows children to implement an emergency stop mechanism. */ contract Pausable is Ownable { event Pause(); event Unpause();
bool public paused = true;
/**
/**
/**
/**
/**
@dev StandardToken modified with pausable transfers. **/ contract PausableToken is StandardToken, Pausable {
function transfer( address _to, uint256 _value ) public whenNotPaused returns (bool) { return super.transfer(_to, _value); }
function transferFrom( address _from, address _to, uint256 _value ) public whenNotPaused returns (bool) { return super.transferFrom(_from, _to, _value); }
function approve( address _spender, uint256 _value ) public whenNotPaused returns (bool) { return super.approve(_spender, _value); }
function increaseApproval( address _spender, uint _addedValue ) public whenNotPaused returns (bool success) { return super.increaseApproval(_spender, _addedValue); }
function decreaseApproval( address _spender, uint _subtractedValue ) public whenNotPaused returns (bool success) { return super.decreaseApproval(_spender, _subtractedValue); } }
contract Philcoin is PausableToken, MintableToken { // public variables string public name = "Philcoin"; string public symbol = "PHC"; uint8 public decimals = 9;
}