优化代码

02_BaseType/Cargo.toml

@@ -6,3 +6,4 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+

02_BaseType/src/main.rs

@@ -23,9 +23,11 @@ fn main() {
     let c_char = 'z';
     let z_char = 'ℤ';
     let heart_eyed_cat_char = '😻';
+    let y_char = '棒';
     let z_string = String::from("棒");
-    println!("c_char is {}, z_char is {}, heart_eyed_cat_char is {}", c_char, z_char, heart_eyed_cat_char);
-    println!("字符'c_char'占用了{}字节的内存大小", std::mem::size_of_val(&c_char));
+    println!("c_char is {}, z_char is {}, heart_eyed_cat_char is {}, y_char is {}", c_char, z_char, heart_eyed_cat_char, y_char);
+    println!("字符'c_char'占用了{}字节的内存大小", size_of_val(&c_char));
+    println!("字符'y_char'占用了{}字节的内存大小", size_of_val(&y_char));
     println!("字符串'z_string'内容占用了{}字节的内存大小", &z_string.as_bytes().len());
 
     let tup_var: (i32, f64, u8, char) = (-500, 6.4, 1, 'z');
@@ -36,4 +38,4 @@ fn main() {
     let first_element = a_array[0];
     let second_element = a_array[1];
     println!("The first element is {}, the second element is {}", first_element, second_element);
-}
+}

03_CompoundType/Cargo.toml

@@ -6,4 +6,4 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-itertools = "0.10"
+

03_CompoundType/src/main.rs

@@ -1,5 +1,3 @@
-use itertools::Itertools;
-
 fn main() {
     let mixed = ("Rust", 2023, 3.14, true);
     let (lang, year, pi, status) = mixed;
@@ -15,7 +13,7 @@ fn main() {
     println!("vector v1: {:?}", &v1);
 
     // 2.使用宏 vec! 来创建数组，支持在创建时就给予初始化值
-    let v2 = vec![1u8, 2, 3];  
+    let v2 = vec![1u8, 2, 3];
     println!("vector v2: {:?}", &v2);
 
     let mut s = String::from("Hello"); // 可变的String类型
@@ -27,7 +25,6 @@ fn main() {
 
 
     let numbers = [1, 2, 3, 4, 5];
-    // 给数组 numbers 增加数字 6和7
 
     let slice = &numbers[0..2]; // 引用数组的一部分
 

04_Struct_Enum/src/main.rs

@@ -1,4 +1,3 @@
-
 // 定义一个Person结构体
 struct Person {
     name: String,
@@ -28,4 +27,4 @@ fn main() {
 
     // 调用这个函数，不需要 owner
     show_info();
-}
+}

05_Ownership/src/main.rs

@@ -7,10 +7,11 @@ fn calculate_length(s: &String) -> usize {
     s.len()
 }
 
-fn change(some_string: &mut String) -> &mut String{
+fn change(some_string: &mut String) -> &mut String {
     some_string.push_str(", wtf!");
     some_string
 }
+
 fn main() {
     let mut s1 = String::from("hello"); // s1 是 hello 对象的所有者
     s1.push_str(", wtf!"); // s1 可以修改 hello 对象，追加字符串
@@ -30,4 +31,4 @@ fn main() {
     let mut s4 = String::from("hello");
     change(&mut s4); // s4 发生可变借用，函数可以修改 s4
     println!("{}", s4);
-}
+}

06_Function/src/main.rs

@@ -7,7 +7,7 @@ fn print_sum(a: i32, b: i32) {
 }
 
 fn add_two(a: i32) -> i32 {
-    return a + 2
+    a + 2
     // 或 `return a + 2;`
 }
 
@@ -63,4 +63,4 @@ fn main() {
             break;
         }
     }
-}
+}