2022-02-27 08:16:13 -06:00
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# 元组( Tuple )
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2022-03-02 08:11:56 -06:00
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1. 🌟 元组中的元素可以是不同的类型。元组的类型签名是 `(T1, T2, ...)`, 这里 `T1`, `T2` 是相对应的元组成员的类型.
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2022-02-27 08:16:13 -06:00
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```rust,editable
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fn main() {
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let _t0: (u8,i16) = (0, -1);
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// 元组的成员还可以是一个元组
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let _t1: (u8, (i16, u32)) = (0, (-1, 1));
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// 填空让代码工作
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let t: (u8, __, i64, __, __) = (1u8, 2u16, 3i64, "hello", String::from(", world"));
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}
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```
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2022-03-02 08:11:56 -06:00
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2. 🌟 可以使用索引来获取元组的成员
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2022-02-27 08:16:13 -06:00
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```rust,editable
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// 修改合适的地方,让代码工作
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fn main() {
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let t = ("i", "am", "sunface");
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assert_eq!(t.1, "sunface");
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}
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```
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2022-03-02 08:11:56 -06:00
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3. 🌟 过长的元组无法被打印输出
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2022-02-27 08:16:13 -06:00
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```rust,editable
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// 修复代码错误
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fn main() {
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let too_long_tuple = (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13);
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println!("too long tuple: {:?}", too_long_tuple);
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}
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```
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2022-03-02 08:11:56 -06:00
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4. 🌟 使用模式匹配来解构元组
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2022-02-27 08:16:13 -06:00
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```rust,editable
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fn main() {
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let tup = (1, 6.4, "hello");
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// 填空
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let __ = tup;
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assert_eq!(x, 1);
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assert_eq!(y, "hello");
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assert_eq!(z, 6.4);
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}
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```
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2022-03-02 08:11:56 -06:00
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5. 🌟🌟 解构式赋值
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2022-02-27 08:16:13 -06:00
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```rust,editable
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fn main() {
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let (x, y, z);
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// 填空
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__ = (1, 2, 3);
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assert_eq!(x, 3);
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assert_eq!(y, 1);
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assert_eq!(z, 2);
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}
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```
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2022-03-02 08:11:56 -06:00
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6. 🌟🌟 元组可以用于函数的参数和返回值
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2022-02-27 08:16:13 -06:00
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```rust,editable
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fn main() {
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// 填空,需要稍微计算下
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let (x, y) = sum_multiply(__);
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assert_eq!(x, 5);
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assert_eq!(y, 6);
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}
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fn sum_multiply(nums: (i32, i32)) -> (i32, i32) {
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(nums.0 + nums.1, nums.0 * nums.1)
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}
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```
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2022-03-01 08:06:38 -06:00
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> 你可以在[这里](https://github.com/sunface/rust-by-practice)找到答案(在 solutions 路径下)
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