최신Blockchain BTA Certified Blockchain Developer - Ethereum - CBDE무료샘플문제

A. it's not possible to generate new datatypes in Solidity.

B. it's best to use a struct, which is cheaper than deploying a new contract.

C. its best to use a contract with public storage variables, so it can be used like a class.

A. for JavaScript using Web3.js

B. for Solidity and JavaScript

C. for Java, JavaScript, and C++

D. for any language, as long as it adheres to the open Testing-Interface from Truffle

A. contract should be mixedCase, as well as function names. Events should be capitalized. 2 spaces should be used as indentation and a maximum of 120 characters per line.

B. contract names should be capitalized, while functions should be mixedCase. You should use 4 spaces as indentation and a maximum of 79 (or 99) characters per line.

C. you should capitalize function names, events and contract names, to avoid confusion with JavaScript. You should use Tabs to indentation and a maximum of 80 characters per line.

A. you should follow the checks-effects-interactions pattern, which is only necessary when you do calls to contracts where a direct contract call is not possible.

B. you should follow the checks-effects-interactions pattern and avoid state changes after the call.

C. you should follow the effects-checks-interactions pattern and avoid state changes before the call.

A. will cascade exceptions and address.transfer() will return a false on error.

B. will return false on error while address.transfer() will cascade transactions.

A. False, it's necessary to use Ganache or even a real private network for testing.

B. True, but it's still good to use Ganache, or even a real private network for testing.

A. sends the gas stipend of 2300 gas and cascades exceptions.

B. sends the gas stipend of 2300 gas and returns a false on error.

C. sends all the gas along and returns a false on error.

D. sends all the gas along and cascades exceptions.

A. for which blockchain a smart contract was developed for. It helps to avoid confusion with beta-customers.

B. for which blockchain node a smart contract was developed for. It helps to avoid mixing up different versions of go-ethereum.

C. for which compiler version a smart contract was developed for. It helps to avoid breaking changes.

A. To Sign Transactions And To Derive an Address From.

B. To Generate An Address which can sign transactions.

C. To Protect the Public Keys by being cryptographically significant.

A. is a framework that helps developers with Testing, Deployment and Management of Smart Contracts and Distributed Applications.

B. is a library that helps developers to connect to Ethereum nodes, because it abstracts the JSONRPC interface.

C. is a framework for Java, similar to Web3.js for JavaScript. It's a great way to develop distributed Java enterprise applications.