Compile and run a Rust program from scratch

Pascal Precht
InstructorPascal Precht

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In this lesson we’ll create our first “Hello World” Rust program from scratch and will learn how to compile it using rustc.

Michele Nasti
Michele Nasti
~ a year ago

Why println! function has the exclamation mark at the end? Is this special, a convention, or it's just part of the function name?

Roberto Zaniboni
Roberto Zaniboni
~ a year ago

It is a macro. https://doc.rust-lang.org/rust-by-example/macros.html

Pascal Precht
Pascal Prechtinstructor
~ a year ago

Hi Michele!

As Roberto pointed out, println! is a macro and not just a function. In this course however, I didn't want to go into macros to keep things as simple as possible. So from that perspective, all you needed to know was that println!() is a function for now :)

There will be a course on macros as well, once I've mastered them! :D

J. Matthew
J. Matthew
~ a year ago

Why println! function has the exclamation mark at the end? Is this special, a convention, or it's just part of the function name?

Thanks for asking this; I was wondering the same thing!

Macros sound interesting, based on a quick look at the link @Roberto provided. I look forward to learning more about them (but I appreciate that complexity not being introduced in this video).

Pascal Precht
Pascal Prechtinstructor
~ a year ago

Macros are extremely powerful but not easy to master. I've read into them a while ago and decided to put them aside for now. Glad to hear there's interest in a dedicated course on that! :)