Obsidian/3-99 Research/Rust/Chapter 1 - Introduction.md

First things first

Chapter 1 takes you through an introduction to rustc -- an older version of compiling and running rust that predates Cargo. The first thing I did was create a 'Hello, world!' program.

I also learned that when naming files, the convention is underscores:

Good: hello_world.rs

Bad: helloworld.rs

What does a Rust program look like?

Here was our full hello world program:

fn main() {
    println!("Hello, world!");
}

First, there's the fn main() function. This is always the first piece of code that will run in a Rust program.

Second, indents always happen with 4 spaces, not a tab.

Third, the print statement is doing something a little different. It is a macro, not a function. Macros use ! at the end, while functions do not.

Fourth, each line ends with a semicolon. Much like C.

Cargo!

Cargo is Rust's dependency manager and project creator. Using "cargo new xxx" will create a new project in a folder xxx.