GuessNumber.rs

// @dev cargo doc --open will build a documentation of dependencies and their methods
// @dev alike C,C++ input and output is from standard io library
// @dev std has many features but this time we imported for input feature
use std::io;

// @dev rand is a package/dependency added later through toml
use rand::Rng;

// @dev main is the entry point in the rust program
fn main(){
    // @dev println!() is a function to print output
    println!("Guess the number");

    // @dev this is immutable
    let secret_number = rand::thread_rng().gen_range(1..101);
    println!("The secret number is: {}", secret_number);

    println!("Please input your guess!");
    
    // @dev let is used to create the variables
    // @dev mut keyword refers to mutable since the variables with let are immutable by deafult
    // @dev String::new() is new instance of String - Kind of new object
    // @dev finally created a mutable variable that is currently bound to a new, empty instance of a String
    let mut guess = String::new();

    // @dev calling stdin function from io module
    io::stdin()
    // @dev & is used to reference the variable and mut is used to remind it as a mutable else it'd be &guess
    .read_line(&mut guess)
    // @dev next line is handling the error if something arises while storing text
    .expect("failed to read line!");

    // @dev formatted output possible we could use named parameter as well.
    println!("You guessed {}", guess);
}