# Hello World The classical introductory exercise. Just say "Hello, World!". ["Hello, World!"](http://en.wikipedia.org/wiki/%22Hello,_world!%22_program) is the traditional first program for beginning programming in a new language or environment. The objectives are simple: - Write a function that returns the string "Hello, World!". - Run the test suite and make sure that it succeeds. - Submit your solution and check it at the website. If everything goes well, you will be ready to fetch your first real exercise. ## Rust Installation Refer to the [exercism help page][help-page] for Rust installation and learning resources. ## Writing the Code Execute the tests with: ```bash $ cargo test ``` All but the first test have been ignored. After you get the first test to pass, open the tests source file which is located in the `tests` directory and remove the `#[ignore]` flag from the next test and get the tests to pass again. Each separate test is a function with `#[test]` flag above it. Continue, until you pass every test. If you wish to run all ignored tests without editing the tests source file, use: ```bash $ cargo test -- --ignored ``` To run a specific test, for example `some_test`, you can use: ```bash $ cargo test some_test ``` If the specific test is ignored use: ```bash $ cargo test some_test -- --ignored ``` To learn more about Rust tests refer to the [online test documentation][rust-tests] Make sure to read the [Modules][modules] chapter if you haven't already, it will help you with organizing your files. ## Further improvements After you have solved the exercise, please consider using the additional utilities, described in the [installation guide](https://exercism.io/tracks/rust/installation), to further refine your final solution. To format your solution, inside the solution directory use ```bash cargo fmt ``` To see, if your solution contains some common ineffective use cases, inside the solution directory use ```bash cargo clippy --all-targets ``` ## Submitting the solution Generally you should submit all files in which you implemented your solution (`src/lib.rs` in most cases). If you are using any external crates, please consider submitting the `Cargo.toml` file. This will make the review process faster and clearer. ## Feedback, Issues, Pull Requests The [exercism/rust](https://github.com/exercism/rust) repository on GitHub is the home for all of the Rust exercises. If you have feedback about an exercise, or want to help implement new exercises, head over there and create an issue. Members of the rust track team are happy to help! If you want to know more about Exercism, take a look at the [contribution guide](https://github.com/exercism/docs/blob/master/contributing-to-language-tracks/README.md). [help-page]: https://exercism.io/tracks/rust/learning [modules]: https://doc.rust-lang.org/book/ch07-02-defining-modules-to-control-scope-and-privacy.html [cargo]: https://doc.rust-lang.org/book/ch14-00-more-about-cargo.html [rust-tests]: https://doc.rust-lang.org/book/ch11-02-running-tests.html ## Source This is an exercise to introduce users to using Exercism [http://en.wikipedia.org/wiki/%22Hello,_world!%22_program](http://en.wikipedia.org/wiki/%22Hello,_world!%22_program) ## Submitting Incomplete Solutions It's possible to submit an incomplete solution so you can see how others have completed the exercise.