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

fn main() {
    let mut buffer = String::new();

    print!("Give me an integer, and I will return the first prime found from that: ");
    io::stdout().flush().expect("Failed to flush stdout.");

    io::stdin()
        .read_line(&mut buffer)
        .expect("Error while trying to read the number.");

    let num: usize = buffer
        .trim()
        .parse()
        .expect("The input inserted is not a valid integer");

    match next_prime(num) {
        Some(x) => println!("Here's the first prime found from {}: {}", num, x),
        None => println!("None found"),
    }
}