Practice - 003

A program to read integer and print it in decimal octal and hexadecimal form

use std::io::{stdin,stdout,Write};

fn main() {
    practice3()
}

fn practice3() {
    let mut s=String::new();
    print!("Please enter some text: ");
    let _=stdout().flush();
    stdin().read_line(&mut s).expect("failed to read from stdin");
    if let Some('\n')=s.chars().next_back() {
        s.pop();
    }
    if let Some('\r')=s.chars().next_back() {
        s.pop();
    }

    println!("You typed: {}",s);

    let trimmed = s.trim();
    let (is_integer, integer) = match trimmed.parse::<u32>() {
        Ok(i) => (true, i),
        Err(..) => (false, 0),
    };

    if !is_integer {
        println!("This is not an integer: {}", trimmed);
        return;
    }

    println!("Decimal: {}", integer);
    println!("Octal: {:o}", integer);
    println!("Lower Hex: {:x}", integer);
    println!("Upper Hex: {:X}", integer);
}

Result

Please enter some text: 42
You typed: 142
Decimal: 142
Octal: 216
Lower Hex: 8e
Upper Hex: 8E

Please enter some text: 12abc
You typed: 12abc
This is not an integer: 12abc