pragma solidity ^0.4.24;
/**
* Math operations with safety checks
*/
contract SafeMath {
function safeMul(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a * b;
assert(a == 0 || c / a == b);
return c;
}
function safeDiv(uint256 a, uint256 b) internal pure returns (uint256) {
assert(b > 0);
uint256 c = a / b;
assert(a == b * c + a % b);
return c;
}
function safeSub(uint256 a, uint256 b) internal pure returns (uint256) {
assert(b <= a);
return a - b;
}
function safeAdd(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
assert(c>=a && c>=b);
return c;
}
}
contract QUC is SafeMath{
string public constant name = "QUCash";
string public constant symbol = "QUC";
uint8 public constant decimals = 18;
uint256 public totalSupply = 10000000000 * (10 ** uint256(decimals));
address public owner;
uint256 public buyPrice = 100000;
bool public crowdsaleClosed;
/* This creates an array with all balances */
mapping (address => uint256) public balanceOf;
mapping (address => uint256) public freezeOf;
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);
/* This notifies clients about the amount frozen */
event Freeze(address indexed from, uint256 value);
/* This notifies clients about the amount unfrozen */
event Unfreeze(address indexed from, uint256 value);
/* Initializes contract with initial supply tokens to the creator of the contract */
constructor() public {
balanceOf[msg.sender] = totalSupply; // Give the creator all initial tokens
owner = msg.sender;
emit Transfer(0x0, msg.sender, totalSupply);
}
/* Send coins */
function transfer(address _to, uint256 _value) public returns (bool) {
if (_to == 0x0) revert(); // Prevent transfer to 0x0 address. Use burn() instead
if (_value <= 0) revert();
if (balanceOf[msg.sender] < _value) revert(); // Check if the sender has enough
if (balanceOf[_to] + _value < balanceOf[_to]) revert(); // Check for overflows
balanceOf[msg.sender] = SafeMath.safeSub(balanceOf[msg.sender], _value); // Subtract from the sender
balanceOf[_to] = SafeMath.safeAdd(balanceOf[_to], _value); // Add the same to the recipient
emit Transfer(msg.sender, _to, _value); // Notify anyone listening that this transfer took place
return true;
}
/* Allow another contract to spend some tokens in your behalf */
function approve(address _spender, uint256 _value) public returns (bool success) {
if (_value <= 0) revert();
allowance[msg.sender][_spender] = _value;
return true;
}
/* A contract attempts to get the coins */
function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
if (_to == 0x0) revert(); // Prevent transfer to 0x0 address. Use burn() instead
if (_value <= 0) revert();
if (balanceOf[_from] < _value) revert(); // Check if the sender has enough
if (balanceOf[_to] + _value < balanceOf[_to]) revert(); // Check for overflows
if (_value > allowance[_from][msg.sender]) revert(); // Check allowance
balanceOf[_from] = SafeMath.safeSub(balanceOf[_from], _value); // Subtract from the sender
balanceOf[_to] = SafeMath.safeAdd(balanceOf[_to], _value); // Add the same to the recipient
allowance[_from][msg.sender] = SafeMath.safeSub(allowance[_from][msg.sender], _value);
emit Transfer(_from, _to, _value);
return true;
}
function burn(uint256 _value) public returns (bool success) {
if (balanceOf[msg.sender] < _value) revert(); // Check if the sender has enough
if (_value <= 0) revert();
balanceOf[msg.sender] = SafeMath.safeSub(balanceOf[msg.sender], _value); // Subtract from the sender
totalSupply = SafeMath.safeSub(totalSupply,_value); // Updates totalSupply
emit Burn(msg.sender, _value);
return true;
}
function freeze(uint256 _value) public returns (bool success) {
if (balanceOf[msg.sender] < _value) revert(); // Check if the sender has enough
if (_value <= 0) revert();
balanceOf[msg.sender] = SafeMath.safeSub(balanceOf[msg.sender], _value); // Subtract from the sender
freezeOf[msg.sender] = SafeMath.safeAdd(freezeOf[msg.sender], _value); // Updates totalSupply
emit Freeze(msg.sender, _value);
return true;
}
function unfreeze(uint256 _value) public returns (bool success) {
if (freezeOf[msg.sender] < _value) revert(); // Check if the sender has enough
if (_value <= 0) revert();
freezeOf[msg.sender] = SafeMath.safeSub(freezeOf[msg.sender], _value); // Subtract from the sender
balanceOf[msg.sender] = SafeMath.safeAdd(balanceOf[msg.sender], _value);
emit Unfreeze(msg.sender, _value);
return true;
}
// transfer balance to owner
function withdrawEther(uint256 amount) public {
if(msg.sender != owner) revert();
owner.transfer(amount);
}
function setPrices(bool closebuy, uint256 newBuyPrice) public {
if(msg.sender != owner) revert();
crowdsaleClosed = closebuy;
buyPrice = newBuyPrice;
}
function () external payable {
require(!crowdsaleClosed);
uint amount = msg.value ; // calculates the amount
_transfer(owner, msg.sender, SafeMath.safeMul( amount, buyPrice));
owner.transfer(amount);
}
function _transfer(address _from, address _to, uint _value) internal {
require (balanceOf[_from] >= _value); // Check if the sender has enough
require (balanceOf[_to] + _value > balanceOf[_to]); // Check for overflows
balanceOf[_from] = SafeMath.safeSub(balanceOf[_from], _value); // Subtract from the sender
balanceOf[_to] = SafeMath.safeAdd(balanceOf[_to], _value);
emit Transfer(_from, _to, _value);
}
}
{
"compilationTarget": {
"QUC.sol": "QUC"
},
"evmVersion": "byzantium",
"libraries": {},
"optimizer": {
"enabled": false,
"runs": 0
},
"remappings": []
}
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