9. Introducing loops

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https://github.com/prophen/intro-to-rust/blob/nikema's-notes/exercises/09.md

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use std::io;
use std::process;

fn main() {
    loop {
        println!("Please enter the first number: ");
        let mut first = String::new();
        io::stdin().read_line(&mut first).unwrap();
        let a: u32;
        match first.trim().parse() {
            Ok(value) => a = value,
            Err(_error)=> {
                eprintln!("This is unfortunately not a number");
                process::exit(1)
            }
        };
    
        println!("Please enter the second number: ");
        let mut second = String::new();
        io::stdin().read_line(&mut second).unwrap();
        let b: u32;
        match second.trim().parse() {
            Ok(value) => b = value,
            Err(_error)=> {
                eprintln!("This is unfortunately not a number");
                process::exit(1)
            }
        };
    
        let result = sum(a, b);
        println!("Result: {}", result);
    }
}
fn sum(a: u32, b:u32 ) -> u32 {
    a + b
}

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