Contract structure and syntax in Blockchain / Solidity - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a contract in blockchain programming?

A contract is a set of rules and code that runs on the blockchain to manage digital agreements automatically.

beginner

Name the basic parts of a smart contract structure.

A smart contract usually has: 1) Contract declaration, 2) State variables, 3) Functions, 4) Events, and 5) Constructor.

beginner

What is the purpose of the constructor in a contract?

The constructor runs once when the contract is created. It sets initial values or settings for the contract.

beginner

How do you define a function in a smart contract?

A function is defined with the keyword function, followed by its name, parameters, and code block inside curly braces.

beginner

What is the role of state variables in a contract?

State variables store data permanently on the blockchain and keep the contract's state between function calls.

Which keyword starts the definition of a smart contract?

A contract

B function

C class

D var

The keyword contract is used to declare a smart contract.

What does the constructor in a contract do?

A Runs once to initialize the contract

B Defines a reusable function

C Stores data permanently

D Triggers an event

The constructor runs once when the contract is deployed to set initial values.

Where are state variables stored?

A In temporary memory

B Only during function execution

C On the blockchain permanently

D In the user's device

State variables are stored permanently on the blockchain to keep contract data.

Which symbol is used to group code inside functions?

A () (parentheses)

B {} (curly braces)

C [] (square brackets)

D <> (angle brackets)

Curly braces {} group the code inside functions.

What is the main purpose of events in a contract?

A To declare variables

B To store data permanently

C To define functions

D To log information for external apps

Events help log information that external apps can listen to and react.

Describe the main parts of a smart contract and their roles.

Think about what each part does in managing data and actions.

Explain how a constructor differs from other functions in a contract.

Focus on when and how often it runs.