Knowledge check

1.

Solidity smart contracts are run on:

Ethereum blockchain

The Ethereum Virtual Machine

Any virtual machine

Any sandbox environment

2.

Events describe actions that are taken in a contract. Which syntax defines an event?

event PurchasedItem

event PurchasedItem(address buyer, uint price);

emit PurchasedItem(address buyer, uint price);

PurchasedItem(address buyer, uint price);

3.

What is an example of a user-defined type in Solidity?

Structs

State variables

Addresses

Arrays

4.

What is typically the first line of a smart contract source file?

A contract definition

A pragma directive

A Solidity version

An event

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