port the first exercise from the old curriculum

This commit is contained in:
olivia 2018-05-22 21:22:21 +02:00
parent 729217da2f
commit 6d50965344
1 changed files with 33 additions and 24 deletions

View File

@ -1,29 +1,38 @@
fn guess_this() -> i32 {
let one = 5;
let two = 7;
let three = 3;
let result = (one + two) / three;
return result;
// Welcome to Rustlings! If you're here, that means you've either successfully
// downloaded Rustlings, or are looking at this on GitHub. Either way, let me
// introduce you to one of the most basic elements of Rust:
//
// === VARIABLES ===
//
// Variables are essentially little containers that hold, well, something. Think
// of them as a little cardboard box that you put stuff into. What can you put
// into a virtual cardboard box in Rust? All kinds of stuff, it turns out!
// Numbers, words, sequences, and much more. Let's start out simple, though.
// Here's our first exercise:
pub fn exercise_one() {
let x = 5;
verify!(0, x, "Number assignment");
// ^ ^
// | |
// What's The variable
// in it itself
}
fn simple() -> &'static str {
let hello = "Hello World!";
return hello;
}
mod tests {
use super::*;
pub fn test_simple() {
verify!("Hello World!", simple(), "Simple example");
}
pub fn test_complicated() {
verify!(1, guess_this(), "Complicated example");
}
}
// Did you get all that? The "let" word basically tells us that we now want to
// define a variable, and what follows it, the "x" is the name of the variable.
// Each variable has a name, like a label you put on your cardboard box so you
// don't confuse it with another, similar looking one.
// The whole "verify!" deal essentially means that Rustlings is checking if you
// solved the exercise correctly. It compares the first argument with the
// second, so in this case "0" with "x", where "x" is the _value_ of the variable
// we called "x". When you write "x", you pull out the cardboard box labelled "x"
// and take out what's inside of it.
// Speaking of which, what *is* inside of our "x" cardboard box? I don't think it's
// "0"... do you know? Replace the "0" with the value of the variable we defined.
// After that, run "cargo run" in your command line, and see if you put in the
// right answer.
pub fn exec() {
tests::test_simple();
tests::test_complicated();
exercise_one();
}