[initial] first edition

.gitignore

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+/target

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "course_2"
+version = "0.1.0"
+dependencies = [
+ "email_address",
+]
+
+[[package]]
+name = "email_address"
+version = "0.2.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e079f19b08ca6239f47f8ba8509c11cf3ea30095831f7fed61441475edd8c449"
+dependencies = [
+ "serde",
+]
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.103"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5ee95bc4ef87b8d5ba32e8b7714ccc834865276eab0aed5c9958d00ec45f49e8"
+dependencies = [
+ "unicode-ident",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.42"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a338cc41d27e6cc6dce6cefc13a0729dfbb81c262b1f519331575dd80ef3067f"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "serde"
+version = "1.0.228"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9a8e94ea7f378bd32cbbd37198a4a91436180c5bb472411e48b5ec2e2124ae9e"
+dependencies = [
+ "serde_core",
+]
+
+[[package]]
+name = "serde_core"
+version = "1.0.228"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "41d385c7d4ca58e59fc732af25c3983b67ac852c1a25000afe1175de458b67ad"
+dependencies = [
+ "serde_derive",
+]
+
+[[package]]
+name = "serde_derive"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "syn"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "unicode-ident"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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Cargo.toml

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+[package]
+name = "course_2"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+email_address = "0.2.9"

src/main.rs

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+use email_address::EmailAddress;
+use std::{fmt::Debug, str::FromStr};
+
+/// Data in Gender represents age.
+enum Gender {
+    Male(u8),
+    Female(u8),
+}
+
+#[allow(unused)]
+struct Student {
+    name: String,
+    gender: Gender,
+    grade: u8,
+    email: EmailAddress,
+}
+
+fn get_line() -> String {
+    let mut input = String::new();
+    std::io::stdin()
+        .read_line(&mut input)
+        .expect("Failed to read line");
+    input
+}
+
+fn from_prompt<T: FromStr>(prompts: &str) -> T
+where
+    <T as FromStr>::Err: Debug,
+{
+    loop {
+        // print or reprint the prompts
+        println!("{}", prompts);
+
+        // get the original line input
+        let input = get_line();
+
+        // parse the input to the generic type
+        match input.trim().parse::<T>() {
+            Ok(value) => break value,
+            Err(err) => {
+                println!("Invalid input: {:?}, please input again.", err);
+                continue;
+            }
+        }
+    }
+}
+
+impl FromStr for Gender {
+    type Err = String;
+    fn from_str(input: &str) -> Result<Self, Self::Err> {
+        let parts: Vec<&str> = input.trim().split_whitespace().collect();
+
+        if parts.len() != 2 {
+            return Err("i   nvalid input".to_string());
+        }
+
+        let age: u8 = match parts[1].parse() {
+            Ok(age) => age,
+            Err(_) => return Err("invalid age".to_string()),
+        };
+
+        match parts[0].to_lowercase().as_str() {
+            "m" => Ok(Gender::Male(age)),
+            "f" => Ok(Gender::Female(age)),
+            _ => Err("invalid gender".to_string()),
+        }
+    }
+}
+
+fn get_students() -> Vec<Student> {
+    let mut students = Vec::new();
+    loop {
+        let student = Student {
+            name: from_prompt("please input student's name:"),
+            gender: from_prompt("please input student's gender (M/F) and age:"),
+            grade: from_prompt("please input student's grade:"),
+            email: from_prompt("please input student's email:"),
+        };
+
+        students.push(student);
+
+        if from_prompt::<String>("Do you want to quit?")
+            .trim()
+            .to_ascii_lowercase()
+            == "quit"
+        {
+            return students;
+        }
+    }
+}
+
+fn main() {
+    let students = get_students();
+
+    students.iter().for_each(|student| match student.gender {
+        Gender::Male(age) => {
+            if age > 16 {
+                println!("To {}, please clean the floor.", student.name)
+            } else {
+                println!("To {}, please throw the trash.", student.name)
+            }
+        }
+        Gender::Female(age) => {
+            if age > 16 {
+                println!("To {}, please clean the blackboard.", student.name)
+            } else {
+                println!("To {}, please clean the desk.", student.name)
+            }
+        }
+    });
+}