read-ints.rs

use std::io;
use std::io::BufRead;


fn do_the_work() -> io::Result<()> {
    let stdin = io::stdin();
    for line in stdin.lock().lines() {
        let line = try!(line);
        let splut: Result<Vec<i32>, _> = line.split(" ").map(|s| s.parse()).take(3).collect();
        match splut {
            Ok(ref v) if v.len() == 2 =>
                println!("a - 1: {}; b * 2: {}", v[0] - 1, v[1] * 2),
            _ => println!("unparsable line: {:?}", line),
        }
    }
    Ok(())
}

fn main() {
    do_the_work().unwrap();
}