enter image description here pragma solidity ^0.5.0;
contract Tether {
string public name = 'Tether';
string public symbol = 'USDT';
uint256 public totalSupply = 1000000000000000000000000;
uint8 public decimals = 18;
event Transfer(
address indexed _from,
address indexed _
我正在写投票合同和面临几个声明错误,因为引用DeclarationError: Identifier not found or not unique. Voter[] public voters; ^---^这是我的完整代码如下。我不确定我做错了什么。
contract Ballot {
int public majorityVotes;
Candidate[] public candidates;
mapping (address => uint) public voterId;
Voter[] public voters;
event CandidateAdded (ui
在尝试在NHibernate中创建双向一对一映射时,我发现无法以递归方式获得对象的引用。
例如:假设我在Person和Address之间有一对一的关系。
然后,在执行以下代码后,
class Person
{
... ...
public Address Address { get;set; }
}
class Address
{
... ...
public Person Person {get;set;}
}
Repository<Person> rep = new Repository<Person>();
Person p =
这是投注智能合约,问题是用户/地址需要投注不同的匹配。智能合约只在一个映射值上设计。完整源代码:https://github.com/laronlineworld/bettingMatch/blob/main/bettingMatch.sol contract Betting is Ownable {
uint256 public minimumBet;
event EtherTransfer(address beneficiary, uint amount);
//Initialize in 10 matches (It can be improved)
我有ERC20合同
pragma solidity ^0.5.7;
library SafeMath {
/**
* @dev Multiplies two unsigned integers, reverts on overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
// Gas optimization: this is cheaper than requiring 'a' not being zero, bu
我经历过类似的问题,奇怪的是,似乎没有一个问题能解决这个问题。
我正在创建一个简单的令牌契约
contract Token {
mapping(address => uint) public balances;
mapping(address => mapping(address => uint)) public allowance;
uint public totalSupply = 1000;
string public name = "test1";
string public symbol = "t1
每次我试图在测试网络上部署令牌契约时,都会遇到以下错误:
编译器调试日志:错误!无法生成合同ByteCode和ABI在源代码中找到了以下ContractName: SafeMath,令牌,但我们无法找到匹配的字节码(err_code_2)进行故障排除,您可以尝试使用Remix - Solidity编译源代码并检查异常。
这是我的密码:
//SPDX-License-Identifier: Unlicensed
pragma solidity ^0.8.7;
library SafeMath {
function Add(uint a, uint b) public pure
我有4个类,如下所述,手动创建bean映射程序是很费时的。库可以自动生成bean映射程序类。
public class UserDao {
private int id;
private String name;
private List<AddressDao> address;
}
public class AddressDao {
public String city;
public String Country;
}
public class UserDto {
private int userID;
pri
我部署了VrfTest合同并导入了它。但混音不断地说下面的错误。我是不是做错了进口的事?VrfTest合同在“混合”中的同一文件夹中。
DeclarationError: Identifier not found or not unique.
--> contracts/SampleERC721.sol:21:5:
|
21 | VrfTest public vrfContract;
| ^^^^^^^
import "./VrfTest.sol";
contract BullBear is ERC721, ERC721Enumerab
很新鲜的东西,
尝试创建一个简单的Keno游戏,我想为每个门票存储一个10个号码的数组,并将其映射到这个地址,每个地址可以有一个无限数量的门票。
pragma solidity ^0.8.4;
import "hardhat/console.sol";
contract Keno {
address public manager;
uint public minimumBet;
// Create a ticket struct to represent a single ticket
struct Ticket {
bytes32