let secret_num = rand::thread_rng().gen_range(1, 101);
但 在官方文档中,代码是
let secret_num = rand::thread_rng().gen_range(1..=100);
为什么它返回的是范围而不是整数.
完整代码
use std::io;
use std::cmp::Ordering;
use rand::Rng;
use colored::*;
fn main() {
let secret_num = rand::thread_rng().gen_range(1..=100);
println!("The secret number is {}", secret_num);
println!("Guess the Number!");
loop {
println!("Please input you guess: ");
let mut guess = String::new();
io::stdin()
.read_line(&mut guess)
.expect("Failed to read line");
println!("You guessed: {}", guess);
let guess: u32 = match guess.trim().parse() {
Ok(num) => num,
Err(_) => continue,
};
match guess.cmp(&secret_num) {
Ordering::Less => println!("{}", "Too small!".red()),
Ordering::Greater => println!("{}", "Too big!".red()),
Ordering::Equal => {
println!("{}", "You win!".green());
break;
},
}
}
}