Can get guessing game example from The Book to run but not to compile

[PieCellarOlive]

I'm able to get the guessing game example from The Book to run (via cargo run) but not to compile (via rustc). Here are the code and errors:

main.rs

use rand::Rng;
use std::cmp::Ordering;
use std::io::stdin;

fn main() {
    println!("Guess the number!");

    let secret_number: i32 = rand::thread_rng().gen_range(1..101);

    println!("The secret number is {}.", secret_number);

    println!("Please input your guess: ");

    let mut guess: String = String::new();

    stdin()
        .read_line(&mut guess)
        .expect("Failed to read line.");

    let guess: i32 = guess.trim().parse().expect("Please type a number!");

    println!("You guessed: {}", guess);

    match guess.cmp(&secret_number) {
        Ordering::Less => println!("Too small."),
        Ordering::Equal => println!("You win!"),
        Ordering::Greater => println!("Too large."),
    }
}

Cargo.toml

...
[dependencies]
rand = "0.8.3"

errors from rustc src/main.rs

error[E0432]: unresolved import `rand`
 --> src/main.rs:1:5
  |
1 | use rand::Rng;
  |     ^^^^
  |     |
  |     unresolved import
  |     help: a similar path exists: `io::sys::rand`

error[E0433]: failed to resolve: use of undeclared crate or module `rand`
 --> src/main.rs:8:30
  |
8 |     let secret_number: i32 = rand::thread_rng().gen_range(1..101);
  |                              ^^^^ use of undeclared crate or module `rand`

I'm still very new to Rust (this is the second chapter of the introductory book) and so haven't been able to troubleshoot those errors. Could someone help me?

[Hyeonu]

It's because the rustc cli is a huge beast and not meant to be invoked directly by most people. We have a first party build tool called cargo. If you want to build a executable without running it, use cargo build. If you want more info about it checkout the cargo book. Though you may not need it yet at this stage.

[PieCellarOlive]

cargo build runs but doesn't appear to create an executable file

[Hyeonu]

Are you on windows? If so it should create an executable at PROJECT_DIR\target\debug\PROJECT_NAME.exe

[Hyeonu]

In case if you missed, here's the book chapter which describes it.
https://doc.rust-lang.org/stable/book/ch01-03-hello-cargo.html#building-and-running-a-cargo-project