The Complete Solidity Course - Zero to Advanced for Blockchain and Smart Contracts - Visibility - Public Private Interna

The video tutorial explores the use of keywords in smart contracts, focusing on public, private, internal, and external access modifiers. It explains how these keywords control the visibility and accessibility of functions and variables within and outside contracts. The tutorial highlights the differences between them and their implications on contract design. The next video will apply these concepts to functions.

What is the main feature of the public keyword in smart contracts?

• It only allows access from derived contracts.

• It allows access from both inside and outside the contract.

• It restricts access to within the contract.

• It prevents any access to the function or variable.

How does the private keyword affect access to a variable in a smart contract?

• It allows access from outside the contract.

• It allows access from derived contracts.

• It restricts access to within the contract only.

• It makes the variable accessible from any contract.

What is a key difference between private and internal keywords?

• Internal allows access from derived contracts.

• Private allows access from any contract.

• Private allows access from derived contracts.

• Internal allows access from outside the contract.

What does the external keyword imply about function access?

• It restricts access to outside the contract only.

• It allows access from within the contract.

• It allows access from derived contracts.

• It makes the function inaccessible.

Why is it not practical to declare a state variable as external?

• It allows access from within the contract.

• It allows access from any contract.

• It prevents access from within the contract.

• It restricts access to derived contracts.