7. Error Handling using Pattern Matching

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https://github.com/prophen/intro-to-rust/blob/nikema's-notes/exercises/07.md

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use std::io;

fn main() {
    println!("Please enter the first number: ");
    let mut first = String::new();
    io::stdin().read_line(&mut first).unwrap();
    let mut a: u32 = 0;
    match first.trim().parse() {
        Ok(value) => a = value,
        Err(_error)=> eprintln!("This is unfortunately not a number")
    };

    println!("Please enter the second number: ");
    let mut second = String::new();
    io::stdin().read_line(&mut second).unwrap();
    let mut b: u32 = 0;
    match second.trim().parse() {
        Ok(value) => b = value,
        Err(_error)=> eprintln!("This is unfortunately not a number")
    };

    let result = sum(a, b);
    println!("Result: {}", result);
}
fn sum(a: u32, b:u32 ) -> u32 {
    a + b
}

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