Product of Two Numbers in Rust

A simple program that I wrote using Rust programming language that will ask the user to give two numbers and then our program will find its product. The code is very simple and easy to understand.

Add me at Facebook my address  is jakerpomperada@gmail.com and jakerpomperada@yahoo.com.

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Sample Program Output

Program Listing

product_two.rs

// Product of Two Numbers in Rust Programming language.

// Written By: Mr. Jake R. Pomperada, MAED-IT

// July 17, 2016

use std::io::{self, Write};

use std::fmt::Display;

use std::process;

fn main() {

       println!("\n");

       println!("\tProduct of Two Numbers in Rust");

       println!("\n");

    let value1: i32 = grab_input("Enter First Number ")

        .unwrap_or_else(|e| exit_err(&e, e.raw_os_error().unwrap_or(-1)))

        .trim()

        .parse()

        .unwrap_or_else(|e| exit_err(&e, 2));

    let value2: i32 = grab_input("Enter Second Number ")

        .unwrap_or_else(|e| exit_err(&e, e.raw_os_error().unwrap_or(-1)))

        .trim()

        .parse()

        .unwrap_or_else(|e| exit_err(&e, 2));

    let product = value1 * value2;

    println!("\n"); 

    println!("===== DISPLAY RESULTS =====");

    println!("\n"); 

    println!("The product of {} and {} is {}. ",value1,value2,product);

    println!("\n"); 

    println!("End of Program");

}

fn grab_input(msg: &str) -> io::Result<String> {

    let mut buf = String::new();

    print!("{}: ", msg);

    try!(io::stdout().flush());

    try!(io::stdin().read_line(&mut buf));

    Ok(buf)

}

fn exit_err<T: Display>(msg: T, code: i32) -> ! {

    let _ = writeln!(&mut io::stderr(), "Error: {}", msg);

    process::exit(code)

}