extern crate rand;

use std::io;
use std::cmp::Ordering;
use rand::Rng;

fn main() {
    println!("Hello in my guessing game!");

    let secret_number = rand::thread_rng().gen_range(1, 101);

    println!("The secret number is: {}", secret_number);
    loop {
        println!("Input your guess, please:");

        let mut guess = String::new();

        io::stdin().read_line(&mut guess)
            .expect("Failed to read line!");

        let guess: u32 = match guess.trim().parse() {
            Ok(num) => num,
            Err(_) => continue
        };

        println!("Your guess is: {}", guess);

        match guess.cmp(&secret_number) {
            Ordering::Less => println!("Too low!"),
            Ordering::Greater => println!("Too big!"),
            Ordering::Equal => {
                println!("Great guess! You win!");
                break;
            }
        }
    }
}

extern crate rand;

use std::io;
use std::cmp::Ordering;
use rand::Rng;

fn main() {
    println!("Hello in my guessing game!");

    let secret_number = rand::thread_rng().gen_range(1, 101);

    loop {
        println!("Input your guess, please:");

        let mut guess = String::new();

        io::stdin().read_line(&mut guess)
            .expect("Failed to read line!");

        let guess: u32 = match guess.trim().parse() {
            Ok(num) => num,
            Err(_) => continue
        };

        println!("Your guess is: {}", guess);

        match guess.cmp(&secret_number) {
            Ordering::Less => println!("Too low!"),
            Ordering::Greater => println!("Too big!"),
            Ordering::Equal => {
                println!("Great guess! You win!");
                break;
            }
        }
    }
}

Remove printing the secret number
Remove printing the secret number
