#![allow(dead_code, deprecated, unused_variables, unused_mut)]
use std::fmt;
struct Length(i32);
impl fmt::UpperExp for Length {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        let val = f64::from(self.0);
        fmt::UpperExp::fmt(&val, f)
    }
}
fn main() {
    let l = Length(100);
    assert_eq!(
        format!("l in scientific notation is: {l:E}"), "l in scientific notation is: 1E2"
    );
    assert_eq!(
        format!("l in scientific notation is: {l:05E}"),
        "l in scientific notation is: 001E2"
    );
}