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lottery.sol
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lottery.sol
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//SPDX-License-Identifier: GPL-3.0
//Lottery SmartContract
pragma solidity >=0.5.0 <0.9.0;
contract Lottery{
address payable[] public players;
address public manager;
constructor(){
manager = msg.sender;
}
receive() external payable{
//checks if value sent to the contract is 0.1 ether, else fails.
require(msg.value == 0.1 ether);
//Convert An Address to A Payable one
players.push(payable(msg.sender));
}
function getBalance() public view returns(uint){
require(msg.sender == manager);
return address(this).balance;
}
function random() public view returns(uint){
return uint(keccak256(abi.encodePacked(block.difficulty, block.timestamp, players.length)));
}
function pickWinner() public{
require(msg.sender == manager);
require(players.length >= 3);
uint r = random();
address payable winner;
uint winnerIndex = r % players.length;
winner = players[winnerIndex];
winner.transfer(getBalance());
//Resetting the Lottery Contract
players = new address payable[](0);
}
}