Rust Programming Cookbook

How to do it...

Let's use Rust's unit tests as a playground for some data type experiments:

1. Create a new project using cargo new data-types -- lib and use an editor to open the projects directory.
2. Open src/lib.rs in your favorite text editor (Visual Studio Code).
3. In there, you will find a small snippet to run a test:

#[cfg(test)]mod tests {    #[test]    fn it_works() {        assert_eq!(2 + 2, 4);    }}

4. Let's replace the default test to play with various standard data types. This test uses a few ways to work with data types and their math functions, as well as mutability and overflows:

    #[test]    fn basic_math_stuff() {        assert_eq!(2 + 2, 4);        assert_eq!(3.14 + 22.86, 26_f32);        assert_eq!(2_i32.pow(2), 4);        assert_eq!(4_f32.sqrt(), 2_f32); let a: u64 = 32; ...