use std::fs::File;
use std::io;

fn f1() -> u32 {
    let greeting_file_result = File::open("hello.txt");
    match greeting_file_result {
        Ok(ref f) => println!("{f:?}"),
        Err(e) => {
            println!("Fehler passiert:{e:?}");
            return 1;
        }
    }

    let file = greeting_file_result.unwrap_or_else(|e| {
        println!("Fehler!");
        panic!();
    });
    println!("{file:?}");
    println!("Tschuess");
    0
}

fn f2() -> Result<u32, io::Error> {
    let _f = File::open("hello.txt")?;
    Ok(0_u32)
}

pub fn nov7() {
    // f1();
    let r = f2();
    println!("f2: r = {r:?}");
}