init code

3.Custom Types/3.2.2 C-like/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "c-like"
+version = "0.1.0"

3.Custom Types/3.2.2 C-like/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "c-like"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

3.Custom Types/3.2.2 C-like/src/main.rs

@@ -0,0 +1,25 @@
+// 禁用未使用的代码警告
+#![allow(dead_code)]
+
+// 当不指明任意类型的时候，枚举项默认从 0 开始
+enum Number {
+    Zero,
+    One,
+    Two,
+}
+
+// 明确指明枚举项的值
+enum Color {
+    Red = 0xff0000,
+    Green = 0x00ff00,
+    Blue = 0x0000ff,
+}
+
+fn main() {
+    // 枚举可以强制转换成数字
+    println!("zero is {}", Number::Zero as i32);
+    println!("one is {}", Number::One as i32);
+
+    println!("roses are #{:06x}", Color::Red as i32);
+    println!("violets are #{:06x}", Color::Blue as i32);
+}