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guessing_game/.gitignore

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+/target

guessing_game/Cargo.toml

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+[package]
+name = "guessing_game"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+rand='0.8.5'

guessing_game/src/main.rs

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+//prelude 预导入: Rust 会导入一些默认的模块供给使用，但是其他的就需要手动使用use导入
+use std::{cmp::Ordering, io};
+use rand::{Rng, thread_rng};
+
+fn main() {
+    println!("猜数游戏");
+
+    let mut rng = thread_rng();
+    let secret_num:u32= rng.gen_range(1..100);
+    // println!("神秘数字是 {}", secret_num);
+    loop {
+        println!("请猜测一个数字");
+        let mut guess = String::new();
+        let str_len = io::stdin().read_line(&mut guess).expect("读取行错误错误");
+        // println!("你输入的内容长度是 {}， 内容为：{}",str_len, guess);
+        let guess:u32 = match guess.trim().parse() {
+            Ok(num) => num,
+            Err(_) => {
+                println!("字符串非数字无法解析");
+                continue;
+            }
+        };
+        match guess.cmp(&secret_num){
+            Ordering::Less => println!("你猜的数字太小"),
+            Ordering::Greater => println!("你猜的数字太大"),
+            Ordering::Equal => {println!("你猜对了");break;},
+        }
+    }
+}