Faucet 在以太坊網路稱為水龍頭，它向任何提出申請的地址發送底層幣，
1. faucet1.sol
pragma solidity ^0.4.19;
contract Faucet {
// Give out ether to anyone who asks
function withdraw(uint withdraw_amount) public { // 提幣函式
// Limit withdrawal amount
require(withdraw_amount <= 100000000000000000); // 每次限額
// Send the amount to the address that requested it
msg.sender.transfer(withdraw_amount); // 發幣
}
// Accept any incoming amount
function() public payable { // 回退函式，可以接收底層幣
}
}2. faucet2.sol
升級版合約：
pragma solidity ^0.8.0;
contract Faucet {
function withdraw(uint withdraw_amount) public {
require(withdraw_amount <= 100000000000000000);
payable(msg.sender).transfer(withdraw_amount);
}
fallback() payable external {}
receive() payable external {}
}本文合約在 remix 編譯部署通過，僅供參考，
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標籤：區塊鏈
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