"Mastering Arbitrum Stylus SDK in C" by Karol Huertas

What is a key advantage of using the C SDK in Arbitrum Stylus over Solidity?

Built-in Solidity compatibility without external calls

Lower-level access to memory and computation for performance optimization

Automatic gas cost reduction for contract execution

How does Arbitrum Stylus handle memory management in C-based contracts?

It relies on Rust’s ownership model

It uses a linear memory model in WebAssembly (WASM)

It requires manual memory allocation and deallocation like traditional C programs

What is the primary role of the C SDK in Arbitrum Stylus?

To enable Solidity developers to call C functions

To allow low-level system interactions and optimize performance in Stylus smart contracts

To provide an alternative EVM execution environment

What is the main purpose of Layer 2 solutions like Arbitrum?

To enhance scalability and reduce congestion

To create new cryptocurrencies

To replace Ethereum entirely

To increase transaction fees

Which programming languages can be used with the Stylus SDK?

Solidity

Rust

All the above

C

What is the purpose of stylus_storage_store in the C SDK?

It writes data to Arbitrum’s Nitro L2 storage

It allows C contracts to store data in an external database

It stores data in Solidity contracts only

How are Ethereum addresses represented in the Arbitrum Stylus C SDK?

As uint160_t

As bytes20

As eth_address_t

Which data type is primarily used for handling token balances in Stylus C contracts?

stylus_bigint_t

uint256_t

int64_t

What function does the C SDK provide to interact with Ethereum storage?

wasm_storage_fetch

evm_storage_read

stylus_storage_load

9. How does Arbitrum Stylus optimize gas usage for C-based contracts?

By batching multiple transactions into a single execution unit

By using WASM-based execution instead of the EVM

By precompiling all contract functions

What does the Stylus SDK allow developers to do?

Create smart contracts

All of the above

Develop Layer 2 solutions

Build decentralized applications

Which compiler is used to compile Rust-based smart contracts for Arbitrum Stylus?

Clang

Solc

Cargo-stylus

What is the key advantage of using Rust over Solidity in Arbitrum Stylus?

Rust contracts are gas-free

Rust contracts require no compilation

Rust enables parallel execution and memory safety

How does Arbitrum Stylus ensure deterministic execution of C-based contracts?

By caching contract states in local memory

By disallowing floating-point operations

By enforcing a single-threaded execution model

What is the correct way to handle logging events from a C-based contract in Arbitrum Stylus?

Writing to stderr in WASM

Calling a Solidity event manually

Using stylus_emit_log()