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