Voting Smart Contract

Overview

This is a simple Ethereum smart contract written in Solidity for conducting a voting process. The contract allows the deployment of candidates, voting by addresses, and declaring a winner based on the highest number of votes.

Features

• Adding Candidates: The owner of the contract can add candidates to the election.

• Voting: Any address can vote for a candidate once.

• Declare Winner: A function is provided to determine and declare the winner based on the highest number of votes.

Smart Contract Details

The smart contract is implemented in Solidity version ^0.8.18.

Functions

1. addCandidate(string memory name)

   • Adds a candidate to the election.
   • Only the owner of the contract can add candidates.

2. getCandidate(uint id) external view returns (string memory name, uint noOfVotes)

   • Retrieves information about a specific candidate.

3. getCandidates() external view returns (string[] memory, uint[] memory)

   • Retrieves information about all candidates.

4. vote(uint id) external

   • Allows an address to vote for a candidate.
   • An address can vote only once.

5. declareWinner() external view returns (string memory winnerName, uint winnerVotes)

   • Determines and returns the winner's name and vote count.

6. changeOwner(address newOwner) public

   • Changes the owner of the contract.

Events

1. Voted(uint indexed id)

   • Emitted when a vote is cast.

2. CandidateCreated(uint indexed candidateNo, string indexed candidateName)

   • Emitted when a new candidate is added.

3. OwnerChange(address indexed oldOwner, address indexed newOwner)

   • Emitted when the owner of the contract is changed.

Storage

• Candidate information is stored in a mapping (candidateLookUp).
• Voter status is stored in a mapping (voterLookUp).

Testing

The smart contract can be tested using foundry (forge test)

Deployment

Deploy the smart contract to the Ethereum blockchain using your preferred deployment method or tool.(forge in foundry)