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January 27, 2021 07:58
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pragma solidity ^0.5.0; | |
interface IERC20 { | |
function totalSupply() external view returns (uint256); | |
function balanceOf(address who) external view returns (uint256); | |
function allowance(address owner, address spender) external view returns (uint256); | |
function transfer(address to, uint256 value) external returns (bool); | |
function approve(address spender, uint256 value) external returns (bool); | |
function transferFrom(address from, address to, uint256 value) external returns (bool); | |
event Transfer(address indexed from, address indexed to, uint256 value); | |
event Approval(address indexed owner, address indexed spender, uint256 value); | |
} | |
library SafeMath { | |
function mul(uint256 a, uint256 b) internal pure returns (uint256) { | |
if (a == 0) { | |
return 0; | |
} | |
uint256 c = a * b; | |
assert(c / a == b); | |
return c; | |
} | |
function div(uint256 a, uint256 b) internal pure returns (uint256) { | |
uint256 c = a / b; | |
return c; | |
} | |
function sub(uint256 a, uint256 b) internal pure returns (uint256) { | |
assert(b <= a); | |
return a - b; | |
} | |
function add(uint256 a, uint256 b) internal pure returns (uint256) { | |
uint256 c = a + b; | |
assert(c >= a); | |
return c; | |
} | |
function ceil(uint256 a, uint256 m) internal pure returns (uint256) { | |
uint256 c = add(a,m); | |
uint256 d = sub(c,1); | |
return mul(div(d,m),m); | |
} | |
} | |
contract ERC20Detailed is IERC20 { | |
string private _name; | |
string private _symbol; | |
uint8 private _decimals; | |
constructor(string memory name, string memory symbol, uint8 decimals) public { | |
_name = name; | |
_symbol = symbol; | |
_decimals = decimals; | |
} | |
function name() public view returns(string memory) { | |
return _name; | |
} | |
function symbol() public view returns(string memory) { | |
return _symbol; | |
} | |
function decimals() public view returns(uint8) { | |
return _decimals; | |
} | |
} | |
contract ANKIT is ERC20Detailed { | |
using SafeMath for uint256; | |
mapping (address => uint256) private _balances; | |
mapping (address => mapping (address => uint256)) private _allowed; | |
string constant tokenName = "ANKIT"; | |
string constant tokenSymbol = "AKT"; | |
uint8 constant tokenDecimals = 18; | |
uint256 _totalSupply = 1000000*10**18; | |
uint256 public basePercent = 100; | |
uint256 public _burnStopAmount; | |
uint256 public _lastTokenSupply; | |
constructor() public payable ERC20Detailed(tokenName, tokenSymbol, tokenDecimals) { | |
_mint(msg.sender, _totalSupply); | |
_burnStopAmount = 500000; | |
_lastTokenSupply = 200000 * 10**18; | |
} | |
function totalSupply() public view returns (uint256) { | |
return _totalSupply; | |
} | |
function balanceOf(address owner) public view returns (uint256) { | |
return _balances[owner]; | |
} | |
function allowance(address owner, address spender) public view returns (uint256) { | |
return _allowed[owner][spender]; | |
} | |
function findOnePercent(uint256 value) public view returns (uint256) { | |
uint256 roundValue = value.ceil(basePercent); | |
uint256 onePercent = roundValue.mul(basePercent).div(10000); | |
return onePercent; | |
} | |
function transfer(address to, uint256 value) public returns (bool) { | |
require(value <= _balances[msg.sender]); | |
require(to != address(0)); | |
uint256 tokensToBurn = findOnePercent(value); | |
uint256 tokensToTransfer = value.sub(tokensToBurn); | |
_balances[msg.sender] = _balances[msg.sender].sub(value); | |
_balances[to] = _balances[to].add(tokensToTransfer); | |
_totalSupply = _totalSupply.sub(tokensToBurn); | |
emit Transfer(msg.sender, to, tokensToTransfer); | |
emit Transfer(msg.sender, address(0), tokensToBurn); | |
return true; | |
} | |
function multiTransfer(address[] memory receivers, uint256[] memory amounts) public { | |
for (uint256 i = 0; i < receivers.length; i++) { | |
transfer(receivers[i], amounts[i]); | |
} | |
} | |
function approve(address spender, uint256 value) public returns (bool) { | |
require(spender != address(0)); | |
_allowed[msg.sender][spender] = value; | |
emit Approval(msg.sender, spender, value); | |
return true; | |
} | |
function transferFrom(address from, address to, uint256 value) public returns (bool) { | |
require(value <= _balances[from]); | |
require(value <= _allowed[from][msg.sender]); | |
require(to != address(0)); | |
_balances[from] = _balances[from].sub(value); | |
uint256 tokensToBurn = findOnePercent(value); | |
uint256 tokensToTransfer = value.sub(tokensToBurn); | |
_balances[to] = _balances[to].add(tokensToTransfer); | |
_totalSupply = _totalSupply.sub(tokensToBurn); | |
_allowed[from][msg.sender] = _allowed[from][msg.sender].sub(value); | |
emit Transfer(from, to, tokensToTransfer); | |
emit Transfer(from, address(0), tokensToBurn); | |
return true; | |
} | |
function increaseAllowance(address spender, uint256 addedValue) public returns (bool) { | |
require(spender != address(0)); | |
_allowed[msg.sender][spender] = (_allowed[msg.sender][spender].add(addedValue)); | |
emit Approval(msg.sender, spender, _allowed[msg.sender][spender]); | |
return true; | |
} | |
function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) { | |
require(spender != address(0)); | |
_allowed[msg.sender][spender] = (_allowed[msg.sender][spender].sub(subtractedValue)); | |
emit Approval(msg.sender, spender, _allowed[msg.sender][spender]); | |
return true; | |
} | |
function _mint(address account, uint256 amount) internal { | |
require(amount != 0); | |
_balances[account] = _balances[account].add(amount); | |
emit Transfer(address(0), account, amount); | |
} | |
function burn(uint256 amount) external { | |
_burn(msg.sender, amount); | |
} | |
function _burn(address account, uint256 amount) internal { | |
require(amount != 0); | |
require(amount <= _balances[account]); | |
_totalSupply = _totalSupply.sub(amount); | |
_balances[account] = _balances[account].sub(amount); | |
emit Transfer(account, address(0), amount); | |
} | |
function burnFrom(address account, uint256 amount) external { | |
require(amount <= _allowed[account][msg.sender]); | |
_allowed[account][msg.sender] = _allowed[account][msg.sender].sub(amount); | |
_burn(account, amount); | |
} | |
} |
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