update readme.md

Readme.md

@@ -1,5 +1,7 @@
 # Rust exercise
-> 中文 Readme [传送门](./zh-CN/Readme.md)。
+- English: [https://exercise.rs](https://exercise.rs)
+- 简体中文: [https://zh.exercise.rs](https://zh.exercise.rs)
+
 
 Greetings and welcome to `exercise.rs`， If you have the following problems: 
 
@@ -9,15 +11,12 @@ Greetings and welcome to `exercise.rs`， If you have the following problems:
 
 Then you have come to a right place: here you can find a bunch of easy to hard exercises to improve your Rust skills which cover almost every topic in Rust，this will help you fill the gap of easy-to-learn and hard-to-use.
 
-## Online Reading
-This book is written in English and Chinese, you can pick up the language you are familiar with:
-- English: [https://exercise.rs](https://exercise.rs)
-- 简体中文: [https://zh.exercise.rs](https://zh.exercise.rs)
+> 中文 Readme [传送门](./zh-CN/Readme.md)。
 
 ## About exercises
-- The only correct way:  make exercise comipile with NO ERRORS!
+- You can edit exercise online and then run it online too
+- **Your only gola is make every exercise comipile with NO ERRORS!**
 - difficulty level: easy: 🌟  medium: 🌟🌟 hard: 🌟🌟🌟  hell: 🌟🌟🌟🌟
-- Everything is online: reading, editing, testing 
 
 
 ## Contributing

en/src/basic-types/statements-expressions.md

@@ -1 +1,59 @@
 # Statements and Expressions
+
+### Examples
+```rust,editable
+fn main() {
+    let x = 5u32;
+
+    let y = {
+        let x_squared = x * x;
+        let x_cube = x_squared * x;
+
+        // This expression will be assigned to `y`
+        x_cube + x_squared + x
+    };
+
+    let z = {
+        // The semicolon suppresses this expression and `()` is assigned to `z`
+        2 * x;
+    };
+
+    println!("x is {:?}", x);
+    println!("y is {:?}", y);
+    println!("z is {:?}", z);
+}
+```
+
+### Exercises
+🌟🌟
+```rust,editable
+// make it work with two ways: both modify the inner {}
+fn main() {
+   let v = {
+       let mut x = 1;
+       x += 2
+   };
+
+   assert_eq!(v, 3);
+}
+```
+
+🌟
+```rust,editable
+
+fn main() {
+   let v = (let x = 3);
+
+   assert!(v == 3);
+}
+```
+
+🌟
+```rust,editable
+
+fn main() {}
+
+fn sum(x: i32, y: i32) -> i32 {
+    x + y;
+}
+```

zh-CN/Readme.md

@@ -1,4 +1,7 @@
 # Rust 练习题
+- English: [https://exercise.rs](https://exercise.rs)
+- 简体中文: [https://zh.exercise.rs](https://zh.exercise.rs)
+
 欢迎大家来到 `exercise.rs`，在来到这里之前不知道你有没有碰到过以下问题:
 
 - 学完知识，想要针对性的练习，但是只能找到一些不痛不痒的习题
@@ -7,15 +10,10 @@
 
 如果你曾经和我有一样的问题，那来到这里就对了：**在这里你能找到大量从简单到困难的 Rust 练习题，不仅能针对性巩固你所学过的知识，解决 Rust 语言难以上手应用的问题**。
 
-## 在线阅读
-本书同时提供了中文和英文版本:
-- English: [https://exercise.rs](https://exercise.rs)
-- 简体中文: [https://zh.exercise.rs](https://zh.exercise.rs)
-
 ## 关于练习题的说明
-- 我们的练习只有一个目的：那就是让编译通过，但是你需要注意相应的提示，例如删除所有代码也可以让练习通过
-- 难度等级: 简单: 🌟  中等: 🌟🌟  困难: 🌟🌟🌟  地狱: 🌟🌟🌟🌟
 - 一切都在线化： 阅读、编辑和测试代码，当然还包括错误提示
+-  每一道练习题都只有一个目的：那就是让编译通过，但是你需要注意相应的提示，例如删除所有代码也可以让练习通过
+- 难度等级: 简单: 🌟  中等: 🌟🌟  困难: 🌟🌟🌟  地狱: 🌟🌟🌟🌟
 
 ## 欢迎你，贡献者
 本项目欢迎一切贡献者，特别是怀揣题库的兄弟，你所贡献的每一道题都会注明你的昵称和个人链接，是时候让全世界看看咱的风采了。

zh-CN/src/basic-types/char-bool-unit.md

@@ -27,7 +27,7 @@ fn print_char(c : char) {
 }
 ```
 
-### Bool
+### 布尔
 🌟
 ```rust, editable
 
@@ -53,7 +53,7 @@ fn main() {
 ```
 
 
-### Unit type
+### 单元类型
 🌟🌟
 ```rust,editable
 

zh-CN/src/basic-types/statements-expressions.md

@@ -1 +1,59 @@
 # Statements and Expressions
+
+### Examples
+```rust,editable
+fn main() {
+    let x = 5u32;
+
+    let y = {
+        let x_squared = x * x;
+        let x_cube = x_squared * x;
+
+        // This expression will be assigned to `y`
+        x_cube + x_squared + x
+    };
+
+    let z = {
+        // The semicolon suppresses this expression and `()` is assigned to `z`
+        2 * x;
+    };
+
+    println!("x is {:?}", x);
+    println!("y is {:?}", y);
+    println!("z is {:?}", z);
+}
+```
+
+### exercises
+🌟🌟
+```rust,editable
+// make it work with two ways: both modify the inner {}
+fn main() {
+   let v = {
+       let mut x = 1;
+       x += 2
+   };
+
+   assert_eq!(v, 3);
+}
+```
+
+🌟
+```rust,editable
+
+fn main() {
+   let v = (let x = 3);
+
+   assert!(v == 3);
+}
+```
+
+🌟
+```rust,editable
+
+fn main() {}
+
+fn sum(x: i32, y: i32) -> i32 {
+    x + y;
+}
+```