The Complete Solidity Course - Zero to Advanced for Blockchain and Smart Contracts - Exercise - Error Handling in Solidi

The video tutorial guides viewers through creating a smart contract named 'vendor' with a state variable 'address seller'. It covers implementing a modifier 'only seller' to ensure only the seller can execute certain functions. The tutorial also explains the 'become seller' function to set the seller and a 'sell' function that is payable and checks if the input amount exceeds the message value, reverting with an error if insufficient ether is provided. The video concludes with encouragement to attempt the task and a promise to provide a solution.

What is the purpose of the 'only seller' modifier in the vendor contract?

• To restrict function execution to the seller

• To allow any user to execute functions

• To handle errors in the contract

• To change the state variable 'seller'

What does the 'become seller' function do in the contract?

• It reverts the transaction if conditions are not met

• It checks the balance of the seller

• It sets the message sender as the seller

• It allows the seller to transfer ownership

Which function in the contract is responsible for handling payments?

• transfer

• sell

• become seller

• only seller

What happens if the ether provided is insufficient in the 'sell' function?

• The contract balance is updated regardless

• The seller is notified but the transaction proceeds

• The transaction is reverted with an error

• The transaction is completed with a warning

Which keyword is used to make a function capable of receiving ether?

• require

• modifier

• transfer

• payable