extern crate rand;

use std::io;
use rand::Rng;

fn main() {
        println!("Guess the number!");

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

        println!("The secret number is: {}", secret_number);

        println!("Please input your guess.");

        let mut guess = String::new();

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

        println!("You guessed: {}", guess);
}

use std::io;

fn main() {
        println!("Guess the number!");

        println!("Please input your guess.");

        let mut guess = String::new();

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

        println!("You guessed: {}", guess);
}

--- 
+++ 
@@ -1,7 +1,14 @@
+extern crate rand;
+
 use std::io;
+use rand::Rng;
 
 fn main() {
         println!("Guess the number!");
+
+        let secret_number = rand::thread_rng().gen_range(1, 101);
+
+        println!("The secret number is: {}", secret_number);
 
         println!("Please input your guess.");
 
Create secret number randomly and output it
