Comments are a necessary part of any serious program, and most non-serious
programs as well.
There are two ways to write comments in Rust, "block" (/**/) and "line"
(//). However, the Rust style guide recommends only using the second.
There are also "Doc" comments, used for documentation.
fn main() {
// This is an example of a line comment
// Notice how there are two slashes at the beginning of the line
// And that anything written inside these will not be read by the compiler
// println!("Hello, world!");
// Run it. See? Now try deleting the two slashes, and run it again.
/*
* This is another type of comment, the block comment. It's not used
* in Rust very often, and is against the Rust Style Guide.
*/
}