Question

How to get the reciprocal of the letters in a string with Rust

Answer 1

fn get_reciprocal(s: &str) -> String {
    let mut tmp = String::new();
    
    for ch in s.chars() {
        if ch.is_ascii_uppercase() {
            tmp.push((b'Z' - (ch as u8 - b'A')) as char);
        } else if ch.is_ascii_lowercase() {
            tmp.push((b'z' - (ch as u8 - b'a')) as char);
        } else {
            tmp.push(ch);
        }
    }
    tmp
}

fn main() {
    let s = "abc++def";
    
    let s = get_reciprocal(s);
    
    println!("{}", s);
}

     
     
/*
run:
 
zyx++wvu
 
*/

 

 

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