simple_math.rs

use std::io;
use std::io::Write;

fn prompt(question: &str) -> String {
    let mut answer = String::new();
    print!("{}: ", question);
    let _ = io::stdout().flush();
    let _ = io::stdin().read_line(&mut answer);
    answer.trim().to_string()
}

fn main() {
    let (first, second) = (prompt("First number").parse::<i32>().unwrap(),
                           prompt("Second number").parse::<i32>().unwrap());
    println!("{} + {} = {}", first, second, first + second);
    println!("{} - {} = {}", first, second, first - second);
    println!("{} * {} = {}", first, second, first * second);
    println!("{} / {} = {}", first, second, first / second);
}