-
Notifications
You must be signed in to change notification settings - Fork 1
/
Lottery system.sol
40 lines (35 loc) · 1021 Bytes
/
Lottery system.sol
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.4;
contract Lottery {
mapping(address => uint) usersBet;
mapping(uint => address) users;
uint nbUsers = 0;
uint totalBets = 0;
address owner;
constructor() {
owner = msg.sender;
}
receive() external payable {
if (msg.value > 0) {
if (usersBet[msg.sender] == 0) {
users[nbUsers] = msg.sender;
nbUsers += 1;
}
usersBet[msg.sender] += msg.value;
totalBets += msg.value;
}
}
function EndLottery() public {
if (msg.sender == owner) {
uint sum = 0;
uint winningNumber = uint(blockhash(block.number - 1)) % totalBets;
for (uint i = 0; i < nbUsers; i++) {
sum += usersBet[users[i]];
if (sum >= winningNumber) {
selfdestruct(address(uint160(users[i])));
return;
}
}
}
}
}