FreeBar Smart Contract The FreeBar smart contract is designed to manage registrations and drink orders at a fictional bar. Users can register themselves and then order drinks, with specific rules and constraints enforced by the contract.

Contract Overview Name: FreeBar Solidity Version: ^0.8.8 License: MIT Features Registration:

Users can register themselves by providing their age. Each user is assigned a unique ID upon registration. A user can only register once. Order Drink:

Registered users can order drinks. A user can only order drinks using their own ID. Users must be older than 18 to order drinks. Each user is limited to a maximum of 3 drinks. Contract Details State Variables uint regId: Tracks the total number of registered users. struct Person: Represents a person with the following properties: uint age: The age of the person. uint id: The unique ID of the person. uint noOfDrinks: The number of drinks ordered by the person. address person: The address of the person. mapping (uint => Person) people: Maps a unique ID to a Person struct. mapping (address => bool) registered: Tracks whether an address has registered. Functions register solidity Copy code function register(uint _age) public returns (uint) Registers a new user.

Parameters: uint _age: The age of the user. Returns: uint: The unique ID assigned to the registered user. Requirements: The user must not have registered before. Increments regId for the next registration. orderDrink solidity Copy code function orderDrink(uint _id) public Allows a registered user to order a drink.

Parameters: uint _id: The unique ID of the user. Requirements: The user must be ordering using their own ID. The user must be older than 18. The user can order a maximum of 3 drinks. Usage Deploying the Contract Deploy the FreeBar contract to your desired Ethereum network using your preferred tool (e.g., Remix, Hardhat, Truffle).

Interacting with the Contract Register a User: Call the register function with the user's age as the argument.

solidity Copy code freeBar.register(25); Order a Drink: Call the orderDrink function with the user's unique ID as the argument.

solidity Copy code freeBar.orderDrink(1); License This project is licensed under the MIT License - see the LICENSE file for details.