"Mastering Arbitrum Stylus SDK in C" by Karol Huertas

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

It requires manual memory allocation and deallocation like traditional C programs

It uses a linear memory model in WebAssembly (WASM)

It relies on Rust’s ownership model

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

Calling a Solidity event manually

Writing to stderr in WASM

Using stylus_emit_log()

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

As bytes20

As uint160_t

As eth_address_t

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

To replace Ethereum entirely

To enhance scalability and reduce congestion

To create new cryptocurrencies

To increase transaction fees

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

Which programming languages can be used with the Stylus SDK?

All the above

C

Solidity

Rust

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

stylus_storage_load

evm_storage_read

wasm_storage_fetch

What does the Stylus SDK allow developers to do?

Create smart contracts

All of the above

Build decentralized applications

Develop Layer 2 solutions

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

Lower-level access to memory and computation for performance optimization

Automatic gas cost reduction for contract execution

Built-in Solidity compatibility without external calls

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

By using WASM-based execution instead of the EVM

By precompiling all contract functions

By batching multiple transactions into a single execution unit

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

By disallowing floating-point operations

By caching contract states in local memory

By enforcing a single-threaded execution model

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

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

To provide an alternative EVM execution environment

To enable Solidity developers to call C functions

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

Solc

Clang

Cargo-stylus

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

uint256_t

stylus_bigint_t

int64_t

What is the purpose of stylus_storage_store in the C SDK?

It writes data to Arbitrum’s Nitro L2 storage

It stores data in Solidity contracts only

It allows C contracts to store data in an external database