The Complete Solidity Course - Zero to Advanced for Blockchain and Smart Contracts - Exercise - Cost Restriction in Soli

The video tutorial guides viewers through an exercise involving the creation of a modifier called 'costs' and a function named 'force owner change' in a smart contract. The modifier ensures that a specified amount of Ether is provided before executing the function, which changes the contract owner. The tutorial emphasizes the importance of using the modifier to enforce this condition and concludes with a mention of a challenging bonus task.

What is the primary purpose of the 'costs' modifier in the exercise?

• To modify the function signature

• To return a string message

• To change the owner of the contract

• To ensure the function is called with a specific amount of ether

What happens if the message value is less than the required amount in the 'costs' modifier?

• The function changes the owner

• The function modifies the ether amount

• The function returns a string indicating insufficient ether

• The function executes with a warning

What is the main requirement for the 'force owner change' function to execute?

• It should be called within a specific time frame

• It must be called by the current owner

• It requires 200 ether to be provided

• It needs a valid address

What is the role of the 'force owner change' function in the exercise?

• To validate the new owner's address

• To forcefully change the contract's owner

• To modify the contract's ether balance

• To execute without any ether requirement

What is hinted at the end of the exercise as a challenging task?

• Creating a new contract

• Implementing a bonus feature

• Deploying the contract

• Writing a test case