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March 21, 2022 08:32
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// SPDX-License-Identifier: MIT | |
pragma solidity ^ 0.8.0; | |
import "github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/math/SafeMath.sol"; | |
import "github.com/OpenZeppelin/openzeppelin-contracts/contracts/token/ERC20/ERC20.sol"; | |
contract SUNcoin is ERC20 { | |
using SafeMath for uint; | |
address public admin; | |
constructor() ERC20('Sun','SUN') { | |
admin = msg.sender; | |
} | |
function Approve(uint amount) external { | |
approve(exchangePool, amount.mul(10**18)); | |
} | |
/* @CrowdSale */ | |
uint internal crowdsale; | |
address internal exchangePool; | |
event tokensMined(address by, uint amount); | |
function startCrowdsale(address wallet) external { | |
require(msg.sender == admin, "only admin"); | |
require(crowdsale == 0, "Crowdsale completed"); | |
crowdsale = 1; | |
exchangePool = wallet; | |
} | |
function endCrowdsale() external { | |
require(msg.sender == admin, "only admin"); | |
require(crowdsale == 1, "Crowdsale not yet started"); | |
crowdsale = 2; | |
_mint(exchangePool, totalSupply()); | |
payable(exchangePool).transfer(address(this).balance); | |
} | |
function crowdSale() external payable { | |
require(crowdsale == 1, "crowdsale inactive"); | |
uint amount = msg.value.div(10**15); | |
_mint(msg.sender, amount.mul(10**18)); | |
emit tokensMined(msg.sender, amount); | |
} | |
} | |
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