CBDE questions • Exam prepare

Exam contains 99 questions

Page 10 of 17

Question 55 🔥

Loops in Solidity:

Which database solution meets these requirements?

A. are a great way to circumvent gas requirements, because a loop will only consume gas once.

B. are dangerous when used with data structures that grow, such as arrays or mapping, because it is hard to estimate the gas requirements.

C. should be avoided where possible, because of unknown side-effects on the gas requirements.

Discussion of the question

Question 56 🔥

Events:

Which database solution meets these requirements?

A. are stored on chain and are a great way to get a return value when a contract calls another contract.

B. are stored in something like a side-chain and cannot be accessed by contracts.

C. are used primarily for debugging exceptions in solidity.

Discussion of the question

Question 57 🔥

According to the official Style Guide:

Which database solution meets these requirements?

A. 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.

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. 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.

Discussion of the question

Question 58 🔥

A version pragma is a great way to make it clear:

Which database solution meets these requirements?

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

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

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

Discussion of the question

Question 59 🔥

Variables of the type address store:

Which database solution meets these requirements?

A. a 20 bytes value

B. a 32 bytes value

C. a string

D. a 20 characters long hex number

Discussion of the question

Question 60 🔥

Address.send():

Which database solution meets these requirements?

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.

Discussion of the question

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blockchain CBDE

Exam contains 99 questions

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