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翻譯
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# If
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`if`, the most basic (but still surprisingly versatile!) type of control flow, is what you'll learn here.
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`if` 是最基本(但仍然非常多用途!)的控制流類型,您將在這裡學習它。
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## Further information
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## 更多資訊
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- [Control Flow - if expressions](https://doc.rust-lang.org/book/ch03-05-control-flow.html#if-expressions)
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- [控制流 - if 表達式](https://doc.rust-lang.org/book/ch03-05-control-flow.html#if-expressions)
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@ -1,18 +1,18 @@
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// if1.rs
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//
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// Execute `rustlings hint if1` or use the `hint` watch subcommand for a hint.
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// 執行 `rustlings hint if1` 或使用 `hint` watch 子命令來獲取提示。
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// I AM NOT DONE
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pub fn bigger(a: i32, b: i32) -> i32 {
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// Complete this function to return the bigger number!
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// If both numbers are equal, any of them can be returned.
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// Do not use:
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// - another function call
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// - additional variables
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// 完成此函數以返回較大的數字!
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// 如果兩個數字相等,可以返回任意一個。
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// 不要使用:
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// - 其他函數調用
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// - 其他變數
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}
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// Don't mind this for now :)
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// 暫時不用管這個 :)
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#[cfg(test)]
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mod tests {
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use super::*;
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@ -1,9 +1,9 @@
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// if2.rs
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//
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// Step 1: Make me compile!
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// Step 2: Get the bar_for_fuzz and default_to_baz tests passing!
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// 第一步:讓我編譯通過!
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// 第二步:讓 bar_for_fuzz 和 default_to_baz 測試通過!
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//
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// Execute `rustlings hint if2` or use the `hint` watch subcommand for a hint.
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// 執行 `rustlings hint if2` 或使用 `hint` watch 子命令來獲取提示。
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// I AM NOT DONE
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@ -15,7 +15,7 @@ pub fn foo_if_fizz(fizzish: &str) -> &str {
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}
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}
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// No test changes needed!
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// 不需要更改測試!
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#[cfg(test)]
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mod tests {
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use super::*;
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@ -1,56 +1,56 @@
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// if3.rs
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//
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// Execute `rustlings hint if3` or use the `hint` watch subcommand for a hint.
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// 執行 `rustlings hint if3` 或使用 `hint` watch 子命令來獲取提示。
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// I AM NOT DONE
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pub fn animal_habitat(animal: &str) -> &'static str {
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let identifier = if animal == "crab" {
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let identifier = if animal == "螃蟹" {
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1
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} else if animal == "gopher" {
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} else if animal == "地鼠" {
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2.0
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} else if animal == "snake" {
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} else if animal == "蛇" {
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3
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} else {
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"Unknown"
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"未知"
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};
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// DO NOT CHANGE THIS STATEMENT BELOW
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// 請勿更改下面的這條語句
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let habitat = if identifier == 1 {
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"Beach"
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"海灘"
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} else if identifier == 2 {
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"Burrow"
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"地洞"
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} else if identifier == 3 {
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"Desert"
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"沙漠"
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} else {
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"Unknown"
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"未知"
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};
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habitat
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}
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// No test changes needed.
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// 不需要更改測試。
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn gopher_lives_in_burrow() {
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assert_eq!(animal_habitat("gopher"), "Burrow")
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assert_eq!(animal_habitat("地鼠"), "地洞")
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}
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#[test]
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fn snake_lives_in_desert() {
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assert_eq!(animal_habitat("snake"), "Desert")
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assert_eq!(animal_habitat("蛇"), "沙漠")
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}
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#[test]
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fn crab_lives_on_beach() {
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assert_eq!(animal_habitat("crab"), "Beach")
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assert_eq!(animal_habitat("螃蟹"), "海灘")
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}
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#[test]
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fn unknown_animal() {
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assert_eq!(animal_habitat("dinosaur"), "Unknown")
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assert_eq!(animal_habitat("恐龍"), "未知")
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}
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}
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@ -1,9 +1,8 @@
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# Primitive Types
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# 原始類型
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Rust has a couple of basic types that are directly implemented into the
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compiler. In this section, we'll go through the most important ones.
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Rust 有幾種基本類型是直接由編譯器實現的。在這一部分,我們將介紹最重要的那些。
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## Further information
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## 更多資訊
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- [Data Types](https://doc.rust-lang.org/stable/book/ch03-02-data-types.html)
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- [The Slice Type](https://doc.rust-lang.org/stable/book/ch04-03-slices.html)
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- [資料型態](https://doc.rust-lang.org/stable/book/ch03-02-data-types.html)
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- [切片類型](https://doc.rust-lang.org/stable/book/ch04-03-slices.html)
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@ -1,20 +1,19 @@
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// primitive_types1.rs
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//
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// Fill in the rest of the line that has code missing! No hints, there's no
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// tricks, just get used to typing these :)
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// 填寫剩下缺少代碼的行!沒有提示,沒有技巧,只是讓您習慣打字 :)
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// I AM NOT DONE
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fn main() {
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// Booleans (`bool`)
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// 布林值 (`bool`)
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let is_morning = true;
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if is_morning {
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println!("Good morning!");
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println!("早安!");
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}
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let // Finish the rest of this line like the example! Or make it be false!
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let is_evening = false; // 像例子一樣完成這行!或者讓它變成 false!
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if is_evening {
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println!("Good evening!");
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println!("晚安!");
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}
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}
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// primitive_types2.rs
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//
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// Fill in the rest of the line that has code missing! No hints, there's no
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// tricks, just get used to typing these :)
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// 填寫剩下缺少代碼的行!沒有提示,沒有技巧,只是讓您習慣打字 :)
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// I AM NOT DONE
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fn main() {
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// Characters (`char`)
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// 字符 (`char`)
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// Note the _single_ quotes, these are different from the double quotes
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// you've been seeing around.
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// 注意是 _單引號_,這與您經常看到的雙引號不同。
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let my_first_initial = 'C';
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if my_first_initial.is_alphabetic() {
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println!("Alphabetical!");
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println!("字母!");
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} else if my_first_initial.is_numeric() {
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println!("Numerical!");
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println!("數字!");
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} else {
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println!("Neither alphabetic nor numeric!");
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println!("既不是字母也不是數字!");
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}
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let // Finish this line like the example! What's your favorite character?
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// Try a letter, try a number, try a special character, try a character
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// from a different language than your own, try an emoji!
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let // 像例子一樣完成這行!您最喜歡的字符是什麼?試試字母、數字、特殊字符,或者不同語言的字符,甚至是表情符號!
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if your_character.is_alphabetic() {
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println!("Alphabetical!");
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println!("字母!");
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} else if your_character.is_numeric() {
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println!("Numerical!");
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println!("數字!");
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} else {
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println!("Neither alphabetic nor numeric!");
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println!("既不是字母也不是數字!");
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}
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}
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// primitive_types3.rs
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//
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// Create an array with at least 100 elements in it where the ??? is.
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// 創建一個包含至少 100 個元素的陣列,並填寫 ??? 處的代碼。
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//
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// Execute `rustlings hint primitive_types3` or use the `hint` watch subcommand
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// for a hint.
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// 執行 `rustlings hint primitive_types3` 或使用 `hint` watch 子命令來獲取提示。
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// I AM NOT DONE
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@ -11,9 +10,9 @@ fn main() {
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let a = ???
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if a.len() >= 100 {
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println!("Wow, that's a big array!");
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println!("哇,那是一個大陣列!");
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} else {
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println!("Meh, I eat arrays like that for breakfast.");
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panic!("Array not big enough, more elements needed")
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println!("嗯,我早餐吃的就是這樣的陣列。");
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panic!("陣列不夠大,需要更多元素")
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}
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}
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// primitive_types4.rs
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//
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// Get a slice out of Array a where the ??? is so that the test passes.
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// 從陣列 a 中獲取一個切片,填寫 ??? 處的代碼,使測試通過。
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//
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// Execute `rustlings hint primitive_types4` or use the `hint` watch subcommand
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// for a hint.
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// 執行 `rustlings hint primitive_types4` 或使用 `hint` watch 子命令來獲取提示。
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// I AM NOT DONE
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// primitive_types5.rs
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//
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// Destructure the `cat` tuple so that the println will work.
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// 解構 `cat` 元組,使 println 可以正常工作。
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//
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// Execute `rustlings hint primitive_types5` or use the `hint` watch subcommand
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// for a hint.
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// 執行 `rustlings hint primitive_types5` 或使用 `hint` watch 子命令來獲取提示。
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// I AM NOT DONE
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fn main() {
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let cat = ("Furry McFurson", 3.5);
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let /* your pattern here */ = cat;
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let /* 在此填寫解構模式 */ = cat;
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println!("{} is {} years old.", name, age);
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}
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// primitive_types6.rs
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//
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// Use a tuple index to access the second element of `numbers`. You can put the
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// expression for the second element where ??? is so that the test passes.
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// 使用元組索引來訪問 `numbers` 的第二個元素。您可以將表達式替換到 ??? 處,使測試通過。
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//
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// Execute `rustlings hint primitive_types6` or use the `hint` watch subcommand
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// for a hint.
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// 執行 `rustlings hint primitive_types6` 或使用 `hint` watch 子命令來獲取提示。
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// I AM NOT DONE
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#[test]
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fn indexing_tuple() {
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let numbers = (1, 2, 3);
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// Replace below ??? with the tuple indexing syntax.
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// 使用元組索引語法替換下面的 ???。
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let second = ???;
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assert_eq!(2, second,
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"This is not the 2nd number in the tuple!")
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"這不是元組中的第二個數字!")
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}
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