选民如何确认候选人的选择没有改变？

编程问答 2022-05-10

问题描述

When the electoral process is over,how can the Voter verify that the candidate’s choice has not changed? 我想在合同中添加一个函数，但是我不知道如何构造这个函数 I want an example when the Voter puts his address,the system returns the name of the candidate who has been chosen since the election process. 我需要智能合约中的一个函数来做到这一点

pragma solidity ^0.6.0;
contract Voting {
    // Model a Candidate
     struct Candidate {
        uint256 id;
        string name;
        uint256 VoteCount;
    }
    mapping(address => bool) public Voters;
    mapping(uint256 => Candidate) public candidates;
    // Store Candidates count
    uint256 public candidatesCount;
    // Voted event
    event VotedEvent(uint256 indexed _candidateId);

    constructor() public {
        addCandidate("Candidate #1");
        addCandidate("Candidate #2");
        addCandidate("Candidate #3");
    }

    function addCandidate(string memory _name) private {
        candidatesCount++;
        candidates[candidatesCount] = Candidate(candidatesCount,_name,0);
    }

    function Vote(uint256 _candidateId) public {
        // require that they haven't Voted before
        require(!Voters[msg.sender]);

        // require a valid candidate
        require(_candidateId > 0 && _candidateId <= candidatesCount);

        // record that Voter has Voted
        Voters[msg.sender] = true;

        // update candidate Vote Count
        candidates[_candidateId].VoteCount++;

        // trigger Voted event
        emit VotedEvent(_candidateId);
    }
    function getCondidateName(address adr)  pure  public returns( string memory ){
        // here i need to create thecode of the verify }}

解决方法

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