Hey everyone, I'm new to the rust community and this may seem really silly but I dont quite get why shadowed version of guess (u32 parsed from string) isn't declared as a mutable variable. I find this a little confusing since we're repeatedly reassigning to the variable inside the loop.
However, when I do make it mutable, compiler tells me it needn't be mutable as a warning. Why is this so?
fn main() {
println!("Guess The Number");
let secret_number = rand::thread_rng().gen_range(1, 101);
println!("Secret number is {}", secret_number);
loop {
println!("Please input your guess");
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(_) => {
println!("Not an integer, input again");
continue;
}
};
println!("You guessed {}", guess);
match guess.cmp(&secret_number) {
Ordering::Less => println!("{}", "Too Small".red()),
Ordering::Greater => println!("{}", "Too Big".red()),
Ordering::Equal => {
println!("{}", "You Win!".green());
break;
}
}
}
}