vault backup: 2025-02-17 16:15:54

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

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+# 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:
+
+```rust
+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.

3-99 Research/Rust/hello_world/hello_cargo/Cargo.toml

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+[package]
+name = "hello_cargo"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

3-99 Research/Rust/hello_world/hello_cargo/src/main.rs

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