Average of Numbers in Rust

A simple program that will compute the average value of five numbers that is being provided by the user using Rust Programming language.

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Sample Program Output

Program Listing

average.js

// Average of Number Program 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!("\tAverage of Number Program in Rust");

       println!("\n");

 

    let num1 : i32 = grab_input("Enter Value No. 1 ")

        .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 num2 : i32 = grab_input("Enter Value No. 2 ")

        .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 num3 : i32 = grab_input("Enter Value No. 3 ")

        .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 num4 : i32 = grab_input("Enter Value No. 4 ")

        .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 num5 : i32 = grab_input("Enter Value No. 5 ")

        .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  solve_average = (num1+num2+num3+num4+num5) / 5;

     

    println!("\n"); 

    println!("The average of {},{},{},{} and {} is {}."

           ,num1,num2,num3,num4,num5,solve_average);

    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)

}