|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
pragma solidity 0.5.16;
|
|
|
|
interface IERC20 {
|
|
|
|
function totalSupply() external view returns (uint256);
|
|
|
|
function decimals() external view returns (uint8);
|
|
|
|
function symbol() external view returns (string memory);
|
|
|
|
function name() external view returns (string memory);
|
|
|
|
function getOwner() external view returns (address);
|
|
|
|
function balanceOf(address account) external view returns (uint256);
|
|
|
|
function transfer(address recipient, uint256 amount) external returns (bool);
|
|
|
|
function allowance(address _owner, address spender) external view returns (uint256);
|
|
|
|
function approve(address spender, uint256 amount) external returns (bool);
|
|
|
|
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
|
|
|
|
event Transfer(address indexed from, address indexed to, uint256 value);
|
|
|
|
event Approval(address indexed owner, address indexed spender, uint256 value);
|
|
}
|
|
|
|
contract Context {
|
|
|
|
constructor () internal { }
|
|
|
|
function _msgSender() internal view returns (address payable) {
|
|
return msg.sender;
|
|
}
|
|
|
|
function _msgData() internal view returns (bytes memory) {
|
|
this;
|
|
return msg.data;
|
|
}
|
|
}
|
|
|
|
library SafeMath {
|
|
|
|
function add(uint256 a, uint256 b) internal pure returns (uint256) {
|
|
uint256 c = a + b;
|
|
require(c >= a, "SafeMath: addition overflow");
|
|
|
|
return c;
|
|
}
|
|
|
|
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
|
|
return sub(a, b, "SafeMath: subtraction overflow");
|
|
}
|
|
|
|
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
|
|
require(b <= a, errorMessage);
|
|
uint256 c = a - b;
|
|
|
|
return c;
|
|
}
|
|
|
|
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
|
|
|
|
if (a == 0) {
|
|
return 0;
|
|
}
|
|
|
|
uint256 c = a * b;
|
|
require(c / a == b, "SafeMath: multiplication overflow");
|
|
|
|
return c;
|
|
}
|
|
|
|
function div(uint256 a, uint256 b) internal pure returns (uint256) {
|
|
return div(a, b, "SafeMath: division by zero");
|
|
}
|
|
|
|
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
|
|
|
|
require(b > 0, errorMessage);
|
|
uint256 c = a / b;
|
|
|
|
return c;
|
|
}
|
|
|
|
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
|
|
return mod(a, b, "SafeMath: modulo by zero");
|
|
}
|
|
|
|
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
|
|
require(b != 0, errorMessage);
|
|
return a % b;
|
|
}
|
|
}
|
|
|
|
contract Ownable is Context {
|
|
address private _owner;
|
|
|
|
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
|
|
|
|
constructor () internal {
|
|
address msgSender = _msgSender();
|
|
_owner = msgSender;
|
|
emit OwnershipTransferred(address(0), msgSender);
|
|
}
|
|
|
|
function owner() public view returns (address) {
|
|
return _owner;
|
|
}
|
|
|
|
modifier onlyOwner() {
|
|
require(_owner == _msgSender(), "Ownable: caller is not the owner");
|
|
_;
|
|
}
|
|
|
|
function renounceOwnership() public onlyOwner {
|
|
emit OwnershipTransferred(_owner, address(0));
|
|
_owner = address(0);
|
|
}
|
|
|
|
function transferOwnership(address newOwner) public onlyOwner {
|
|
_transferOwnership(newOwner);
|
|
}
|
|
|
|
function _transferOwnership(address newOwner) internal {
|
|
require(newOwner != address(0), "Ownable: new owner is the zero address");
|
|
emit OwnershipTransferred(_owner, newOwner);
|
|
_owner = newOwner;
|
|
}
|
|
}
|
|
|
|
contract semicon1 is Context, IERC20, Ownable {
|
|
using SafeMath for uint256;
|
|
|
|
mapping (address => uint256) private _balances;
|
|
|
|
mapping (address => mapping (address => uint256)) private _allowances;
|
|
|
|
uint256 private _totalSupply;
|
|
uint8 private _decimals;
|
|
string private _symbol;
|
|
string private _name;
|
|
|
|
constructor() public {
|
|
_name = "semicon1";
|
|
_symbol = "SMC1";
|
|
_decimals = 18;
|
|
_totalSupply = 200000000000000000000000000;
|
|
_balances[msg.sender] = _totalSupply;
|
|
|
|
emit Transfer(address(0), msg.sender, _totalSupply);
|
|
}
|
|
|
|
function getOwner() external view returns (address) {
|
|
return owner();
|
|
}
|
|
|
|
function decimals() external view returns (uint8) {
|
|
return _decimals;
|
|
}
|
|
|
|
function symbol() external view returns (string memory) {
|
|
return _symbol;
|
|
}
|
|
|
|
function name() external view returns (string memory) {
|
|
return _name;
|
|
}
|
|
|
|
function totalSupply() external view returns (uint256) {
|
|
return _totalSupply;
|
|
}
|
|
|
|
function balanceOf(address account) external view returns (uint256) {
|
|
return _balances[account];
|
|
}
|
|
|
|
function transfer(address recipient, uint256 amount) external returns (bool) {
|
|
_transfer(_msgSender(), recipient, amount);
|
|
return true;
|
|
}
|
|
|
|
function allowance(address owner, address spender) external view returns (uint256) {
|
|
return _allowances[owner][spender];
|
|
}
|
|
|
|
function approve(address spender, uint256 amount) external returns (bool) {
|
|
_approve(_msgSender(), spender, amount);
|
|
return true;
|
|
}
|
|
|
|
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool) {
|
|
_transfer(sender, recipient, amount);
|
|
_approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "Transfer amount exceeds allowance"));
|
|
return true;
|
|
}
|
|
|
|
function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
|
|
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
|
|
return true;
|
|
}
|
|
|
|
function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
|
|
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "Decreased allowance below zero"));
|
|
return true;
|
|
}
|
|
|
|
function _transfer(address sender, address recipient, uint256 amount) internal {
|
|
require(sender != address(0), "Transfer from the zero address");
|
|
require(recipient != address(0), "Transfer to the zero address");
|
|
|
|
_balances[sender] = _balances[sender].sub(amount, "Transfer amount exceeds balance");
|
|
_balances[recipient] = _balances[recipient].add(amount);
|
|
emit Transfer(sender, recipient, amount);
|
|
}
|
|
|
|
function _approve(address owner, address spender, uint256 amount) internal {
|
|
require(owner != address(0), "Approve from the zero address");
|
|
require(spender != address(0), "Approve to the zero address");
|
|
|
|
_allowances[owner][spender] = amount;
|
|
emit Approval(owner, spender, amount);
|
|
}
|
|
|
|
function burn(uint256 amount) public onlyOwner {
|
|
_totalSupply = _totalSupply.sub(amount);
|
|
emit Transfer(_msgSender(),address(0), amount);
|
|
}
|
|
|
|
} |
