rust-exercises/guessing_game/src/main.rs

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use rand::Rng;
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use std::cmp::Ordering;
use std::io;
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pub struct Guess {
value: i32,
}
impl Guess {
pub fn new(value: i32) -> Guess {
if value < 1 || value > 100 {
panic!("Guess value must be between 1 and 100, got {value}.");
}
Guess { value }
}
}
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fn main() {
println!("Guess the number!");
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let secret_number = rand::thread_rng().gen_range(1..=100);
println!("The secret number is: {secret_number}");
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loop {
println!("Please input your guess.");
let mut guess = String::new();
io::stdin()
.read_line(&mut guess)
.expect("Failed to read line");
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let guess: Guess = match guess.trim().parse() {
Ok(num) => Guess::new(num),
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Err(_) => {
println!("Please type a number!");
continue;
},
};
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println!("You guessed: {}", guess.value);
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match guess.value.cmp(&secret_number) {
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Ordering::Less => println!("Too small!"),
Ordering::Greater => println!("Too big!"),
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Ordering::Equal => {
println!("You win!");
break;
},
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}
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}
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}
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#[cfg(test)]
mod tests {
use super::*;
#[test]
#[should_panic]
fn greater_than_100() {
Guess::new(200);
}
}