以下是一个简单的Solidity合约,开发I76案例2o72演示9II9它实现了一个互助计划,其中参与者可以相互捐赠,并在需要时获得捐赠。
scssCopy codepragma solidity ^0.8.0;
contract MMMBSC {
struct Participant {
address payable participantAddress;
uint256 donationAmount;
bool isActive;
uint256 lastDonationTime;
}
Participant[] public participants;
address payable public admin;
uint256 public minDonationAmount;
uint256 public maxDonationAmount;
uint256 public totalDonationAmount;
constructor(uint256 _minDonationAmount,
uint256 _maxDonationAmount) {
admin = payable(msg.sender);
minDonationAmount = _minDonationAmount;
maxDonationAmount = _maxDonationAmount;
}
function donate() public payable {
require(msg.value >= minDonationAmount && msg.
value <= maxDonationAmount, "Donation amount not within the range.");
totalDonationAmount += msg.value;
participants.push(Participant({
participantAddress: payable(msg.sender),
donationAmount: msg.value,
isActive: true,
lastDonationTime: block.timestamp
}));
}
function getDonation() public {
uint256 totalActiveParticipants = getTotalActiveParticipants();
require(totalActiveParticipants > 1, "Not enough active participants to get donation.");
uint256 donationAmount = totalDonationAmount / totalActiveParticipants;
for (uint256 i = 0; i < participants.length; i++) {
Participant storage participant = participants[i];
if (participant.isActive && (block.timestamp - participant.lastDonationTime >= 30 days)) {
participant.participantAddress.transfer(donationAmount);
participant.isActive = false;
totalActiveParticipants--;
}
}
totalDonationAmount = totalActiveParticipants * donationAmount;
}
function getTotalActiveParticipants() private view returns (uint256) {
uint256 totalActiveParticipants = 0;
for (uint256 i = 0; i < participants.length; i++) {
if (participants[i].isActive) {
totalActiveParticipants++;
}
}
return totalActiveParticipants;
}
}
该合约定义了一个结构体Participant,用于表示每个参与者的状态。合约还定义了一个参与者数组participants