Talking Points

main.rs

Like main.cpp in C++ or main.c in C

Tells the compiler which file to start with

Can link to other "crates" and "modules"

Cargo.toml

Keeps track of application metadata

This includes dependencies!

Functions

Strictly typed, like everything in Rust

Declared by fn

Argument typed with argument: Type

Return typed with -> Type otherwise assumed to return nothing

The Main Function

Like the main functions in C and C++

Where the program starts within the main.rs file

CLI arguments handled by std::env, rather than argv and argc in C

Can return nothing or a Result<()>

Macros

Metafunctions or functions for functions

More general than functions, having flexibility in the number of arguments, etc, but harder to write

The println! Macro

Can take any number of arguments that implement the display trait

Usually things like strings or character literals

Will format them into a string and display it on the terminal

Similar to printf in C

The Hello World program

Can be automagically generated with cargo new and then the name of your application

Located in Name-Of-Application/src/main.rs

fn main() {

println!("Hello, world!");

}

Show Notes

Important Links:

Git repo for this miniseries

The Rust Standard Library

The format! macro

The println! macro

Wikipedia Articles:

The Rust Programming Language

Contact Me

Email: izzyleibowitz at pm dot me

Mastodon: at blackernel at nixnet dot social