rust comment types

In Rust, there are two types of comments: line comments and block comments.

Line comments start with two forward slashes // and continue until the end of the line. They are used to add explanatory notes or comments to individual lines of code.

// This is a line comment
let x = 5; // Initializing a variable

Block comments, also known as multi-line comments, start with / and end with /. They can span multiple lines and are used for longer comments or to comment out a block of code.

/* This is a block comment
   It can span multiple lines
   and is often used for documentation */
let y = 10; / Commenting out this line of code /

It is worth noting that Rust also supports doc comments, which are used for generating documentation. Doc comments start with /// for documenting the item immediately following it, or / for documenting the item and all its children.

/// This is a doc comment for a function
/// It will be included in the generated documentation
fn add(a: i32, b: i32) -> i32 {
    a + b
}

These comments are used to provide additional information about the code and improve its readability and maintainability. They do not affect the behavior of the program and are ignored by the compiler.