我收到一个错误TypeError: Member "transfer" not found or not visible after argument-dependent lookup in addressaddress newContractAddress = address(newContract);}function createContract() public payable
这是我在solidity的最新版本为0.4.0时订立的合同,它当时正在工作,但现在它显示了Remix中的错误,所以我将其更新为0.5.0。现在,它在传递函数和keccak256函数中出现了误差。这些错误是:
Typeerror: member balance not found or not visible argument-dependent lookup in contractLotteryUse "address(this).balance"
blob/master/contracts/utils/math/SafeMath.sol";
using SafeMath for uint; totalBets = 0;}
function flipCoin(uint _bet) public payablerequire(msg.sender == owner, "O
我正在读由Packt出版的Jitendra Chittoda出版的“掌握Blockchain编程的坚实”一书。在第129页中,它有一个使用Remix和MetaMask部署的示例契约。DeploymentExample.sol// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0` to `addresspayable`
ERC721 public nonFungibleContract;
addresspayable nftAddress= address(nonFungibleContract);}
TypeError: Type addressis not implicitly convertible to expected type <e