Code Blocks Test

Various tests for code blocks.

Simple

fn main(){
    println!("Hello world!");
}

#![allow(unused)]
fn main() {
let guess: u32 = "42".parse().expect("Not a number!");
}

thread 'main' panicked at 'index out of bounds: the len is 5 but the index is 10', src/main.rs:19:19
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

With Hidden lines

fn main(){
    println!("Hello world!");
}

#![allow(unused)]
fn main() {
println!("This has an implicit main.");
}

fn main() {
    let s1 = String::from("hello");

    let len = calculate_length(&s1);

    println!("The length of '{}' is {}.", s1, len);
}

fn calculate_length(s: &String) -> usize { // s is a reference to a String
    s.len()
} // Here, s goes out of scope. But because it does not have ownership of what
  // it refers to, it is not dropped.

Options

println!("This should not have a playground play button shown.");

Editable

fn main(){
    println!("Hello world!");
}

fn main() {
    let s1 = String::from("hello");

    let len = calculate_length(&s1);

    println!("The length of '{}' is {}.", s1, len);
}

fn calculate_length(s: &String) -> usize { // s is a reference to a String
    s.len()
} // Here, s goes out of scope. But because it does not have ownership of what
  // it refers to, it is not dropped.

let guess: u32 = "42".parse().expect("Not a number!");