🗳️ Decentralized Voting System using Solidity

A decentralized voting smart contract built using Solidity on the Ethereum Virtual Machine (EVM). This project demonstrates the core concepts of blockchain-based voting, including owner-controlled candidate registration, one-wallet-one-vote enforcement, vote counting, and winner determination.

🚀 Features

• Owner can add candidates.
• One wallet can vote only once.
• Prevents voting for invalid candidate IDs.
• Calculates and returns the winning candidate.
• View candidate details and total number of candidates.

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🛠️ Technologies Used

• Solidity ^0.8.34
• Remix IDE
• Ethereum Virtual Machine (EVM)

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📋 Smart Contract Functions

addSomeCandidates(string nameoftheparty)

Adds a new candidate to the election.

Access: Owner only.

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letsgoForVotes(uint id)

Allows a user to vote for a candidate using the candidate ID.

Each wallet address can vote only once.

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winner()

Returns:

• Winner's name
• Total votes received

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candidateDetails(uint id)

Returns:

• Candidate name
• Candidate vote count

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totalCandidates()

Returns the total number of candidates registered.

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🎥 Demo

Screen.Recording.2026-07-29.111134.mp4

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📖 How to Use

1. Deploy the Contract

Deploy the smart contract using Remix IDE.

2. Add Candidates

Only the contract owner can add candidates.

addSomeCandidates("Party A");
addSomeCandidates("Party B");
addSomeCandidates("Party C");

3. Vote

Cast a vote using the candidate ID.

letsgoForVotes(0); // Party A
letsgoForVotes(1); // Party B
letsgoForVotes(2); // Party C

Switch accounts in Remix to simulate different voters.

4. View Results

Get the winner:

winner();

View candidate details:

candidateDetails(0);

View the total number of candidates:

totalCandidates();

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📂 Project Structure

Decentralized-voting-system/
│
├── MyVotingSystem.sol
├── README.md
└── LICENSE

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🔒 Security Features

• Owner-only candidate registration.
• One vote per Ethereum address.
• Input validation using Solidity require() statements.
• Prevents voting for invalid candidate IDs.

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