use std::io::prelude::*;
fn isPrime(n: i32) -> bool {
if n < 2 {
return false;
}
// Try dividing by all numbers from 2 to sqrt(n).
let mut i = 2;
while i*i <= n {
if n % i == 0 {
return false;
}
i += 1;
}
// If we get here, we didn't find a factor, so n is prime.
return true;
}
fn main() {
print!("What is your name? ");
std::io::stdout().flush();
let mut nameIn = String::new();
std::io::stdin().read_line(&mut nameIn).unwrap();
let name = nameIn.trim();
println!("Hello, {}!", name);
print!("What is your favorite number? ");
std::io::stdout().flush();
let mut numberIn = String::new();
std::io::stdin().read_line(&mut numberIn).unwrap();
let number: i32 = numberIn.trim().parse().unwrap();
print!("Your favorite number is {}", number);
if isPrime(number) {
println!(", and that's a prime number!");
} else {
println!(". It's not a prime number, but that's okay!");
}
}
