// ./src/hello/comment.md fn part0() { // This is an example of a line comment // There are two slashes at the beginning of the line // And nothing written inside these will 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, a block comment. In general, * line comments are the recommended comment style. But * block comments are extremely useful for temporarily disabling * chunks of code. /* Block comments can be /* nested, */ */ * so it takes only a few keystrokes to comment out everything * in this part0() function. /*/*/* Try it yourself! */*/*/ */ /* Note: The previous column of `*` was entirely for style. There's no actual need for it. */ // You can manipulate expressions more easily with block comments // than with line comments. Try deleting the comment delimiters // to change the result: let x = 5 + /* 90 + */ 5; println!("Is `x` 10 or 100? x = {}", x); } pub fn main() { part0(); }