Fix the variable type

[rust-101.git] / src / main.rs

// Welcome to Rust-101
// ===================
// 
// This is [Rust-101](https://www.ralfj.de/projects/rust-101/), a small tutorial for
// the [Rust language](https://www.rust-lang.org/). It is intended to be an interactive,
// hands-on course: I believe the only way to *really* learn a language is to write code
// in it, so you should be coding during the course.
// 
// If you have any questions that are not answered here, check out the "Additional Resources"
// below. In particular, the IRC channel is filled with awesome people willing to help you! I spent
// lots of time there ;-)
// 
// I will assume some familiarity with programming, and hence not explain the basic
// concepts common to most languages. Instead, I will focus on what makes Rust special.
//
// Why Rust?
// ---------
// 
// When you got here, I am kind of assuming that you already decided to give Rust at
// least a look, so that I don't have to do much convincing here. But just in
// case, here's why I think Rust is worth learning:<br/>
// At this time, Rust is a language with a pretty unique set of goals. Rust aims to
// achieve C++-style control over memory and execution behavior (like, static vs. dynamic
// dispatch), which makes it possible to construct abstractions that carry no run-time
// cost. This is combined with the comfort of high-level functional languages and guaranteed
// safety (as in, the program will not crash in uncontrolled ways). The vast majority of existing
// languages sacrifices control for safety (for example, by enforcing the usage of
// a garbage collector) or vice versa. Rust can run without dynamic allocation (i.e., without
// a heap), and even without an operating system. In fact, Rust rules out more classes of bugs
// than languages that achieve safety with a garbage collector: Besides dangling pointers and
// double-free, Rust also prevents issues such as iterator invalidation and data races. Finally,
// it cleans up behind you, and deallocates resources (memory, but also file descriptors and really
// anything) when you don't need them anymore.
// 
// 
// Getting started
// ---------------
// 
// You will need to have Rust installed, of course. It is available for download on
// [the Rust website](https://www.rust-lang.org/). Make sure you get at least version 1.3.
// More detailed installation instructions are provided in
// [The Book](https://doc.rust-lang.org/stable/book/).
// This will also install `cargo`, the tool responsible for building rust projects (or *crates*).
// 
// Next, we have to prepare a workspace for you to conduct your Rust-101 work in, so that you don't
// have to start with an empty file. The easiest way is to
// [download the workspace](https://www.ralfj.de/projects/rust-101/workspace.zip)
// matching the online tutorial. Try `cargo build` in that new folder to check that compiling your
// workspace succeeds.
// (You can also execute it with `cargo run`, but you'll need to do some work before this does
// anything useful.)
//
// Alternatively, you can build the workspace from source by fetching the
// [git repository](https://www.ralfj.de/git/rust-101.git) and running `make workspace`.

// Course Content
// --------------
// 
// Open `your-workspace/src/part00.rs` in your favorite editor, and follow the link below for
// the explanations and exercises. You are ready to start. Have fun!
// 
// ### Introduction
//
// * [Part 00: Algebraic datatypes](part00.html)
// * [Part 01: Expressions, Inherent methods](part01.html)
// * [Part 02: Generic types, Traits](part02.html)
// * [Part 03: Input](part03.html)
// 
// ### Basic Rust
// 
// * [Part 04: Ownership, Borrowing, References](part04.html)
// * [Part 05: Clone](part05.html)
// * [Part 06: Copy, Lifetimes](part06.html)
// * [Part 07: Operator Overloading, Tests, Formating](part07.html)
// * [Part 08: Associated Types, Modules](part08.html)
// * [Part 09: Iterators](part09.html)
// * [Part 10: Closures](part10.html)
// 
// ### Advanced Rust
// 
// * [Part 11: Trait Objects, Box, Lifetime bounds](part11.html)
// * [Part 12: Rc, Interior Mutability, Cell, RefCell](part12.html)
// * [Part 13: Concurrency, Arc, Send](part13.html)
// * [Part 14: Slices, Arrays, External Dependencies](part14.html)
// * [Part 15: Mutex, Interior Mutability (cont.), RwLock, Sync](part15.html)
// * [Part 16: Unsafe Rust, Drop](part16.html)
// 
#![allow(dead_code, unused_imports, unused_variables, unused_mut, unreachable_code)]
mod part00;
mod part01;
mod part02;
mod part03;
mod part04;
mod part05;
mod part06;
mod part07;
mod part08;
mod part09;
mod part10;
mod part11;
mod part12;
mod part13;
mod part14;
mod part15;
mod part16;

// To actually run the code of some part (after filling in the blanks, if necessary), simply edit
// the `main` function.
fn main() {
    part00::main();
}


// Additional material
// -------------------
// 
// There's tons of useful Rust stuff out there, so let me just put links to some
// of the most interesting places here:
// 
// * [The Rust Book](https://doc.rust-lang.org/stable/book/)
// * [The Rustonomicon](https://doc.rust-lang.org/nightly/nomicon/)
// * [Rust by Example](http://rustbyexample.com/)
// * The [Rust Subreddit](https://www.reddit.com/r/rust/)
// * A [collection of links](https://github.com/ctjhoa/rust-learning) to blog posts, articles,
//   videos, etc. for learning Rust.
// * For the IRC channel and other forums, see the "Community" section of the
//   [Rust Documentation index](https://doc.rust-lang.org/index.html)