Rust 例子

升级依赖

cargo update

猜数字例子

use std::io;                                                                                                
use std::cmp::Ordering;                                                                                     
use rand::Rng;                                                                                              
                                                                                                            
fn main() {                                                                                                 
    println!("Guess the numbers!");                                                                         
                                                                                                            
    let secret_number = rand::thread_rng().gen_range(1, 101);                                               
                                                                                                            
    //println!("The 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(_) => continue,                                                                             
        };                                                                                                  
                                                                                                            
        println!("You guessed: {}", guess);                                                                 
                                                                                                            
        match guess.cmp(&secret_number) {                                                                   
            Ordering::Less => println!("Too small!"),                                                       
            Ordering::Greater => println!("Too big!"),                                                      
            Ordering::Equal => {                                                                            
                println!("You win!");                                                                       
                break;                                                                                      
            }                                                                                               
        }                                                                                                   
    }                                                                                                       
}