Rust:阴阳谜题输出

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方案一：for

use std::io::{self, Write};
use std::{thread, time};
fn main() {
    let sleep_seconds = time::Duration::from_secs(1000);

    for k in 1..20 {
        print!("@");
        for _ in 1..=k {
            print!("*");
        }
    }
    io::stdout().flush().unwrap();
    thread::sleep(sleep_seconds);
}

方案二：for_each

use std::io::{self, Write};
use std::{thread, time};
fn main() {
    let sleep_seconds = time::Duration::from_secs(1000);

    (1..20).for_each(|k| {
        print!("@");
        (1..=k).for_each(|_| print!("*"))
    });
    io::stdout().flush().unwrap();
    thread::sleep(sleep_seconds);
}

output: