Fixed mistakes and missing semicolon in struct
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@ -1,10 +1,10 @@
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# Struct
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### There types of structs
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### The types of structs
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1. π We must specify concrete values for each of the fields in struct.
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```rust,editable
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// fix the error
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// Fix the error
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struct Person {
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name: String,
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age: u8,
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@ -17,7 +17,7 @@ fn main() {
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age,
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};
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println!("Success!")
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println!("Success!");
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}
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```
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@ -27,35 +27,35 @@ fn main() {
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struct Unit;
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trait SomeTrait {
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// ...Some behavours defines here
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// ...Some behaviors defined here.
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}
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// We don't care the the fields are in Unit, but we care its behaviors.
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// We don't care about what fields are in the Unit, but we care about its behaviors.
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// So we use a struct with no fields and implement some behaviors for it
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impl SomeTrait for Unit { }
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fn main() {
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let u = Unit;
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do_something_with_unit(u);
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println!("Success!")
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println!("Success!");
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}
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// fill the blank to make the code work
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// Fill the blank to make the code work
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fn do_something_with_unit(u: __) { }
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```
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3. πππ Tuple struct looks similar to tuples, it has added meaning the struct name provides but has no named fields. It's useful when you want give the whole tuple a name, but don't care the fields's names.
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3. πππ Tuple struct looks similar to tuples, it has added meaning the struct name provides but has no named fields. It's useful when you want to give the whole tuple a name, but don't care about the fields's names.
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```rust,editable
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// fix the error and fill the blanks
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// Fix the error and fill the blanks
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struct Color(i32, i32, i32);
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struct Point(i32, i32, i32);
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fn main() {
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let v = Point(__, __, __);
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check_color(v);
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println!("Success!")
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println!("Success!");
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}
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fn check_color(p: Color) {
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@ -66,13 +66,13 @@ fn check_color(p: Color) {
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}
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```
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### Operate on structs
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### Operating on structs
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4. π You can make a whole struct mutable when instantiate it, but Rust doesn't allow us to mark only certain fields as mutable.
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4. π You can make a whole struct mutable when instantiating it, but Rust doesn't allow us to mark only certain fields as mutable.
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```rust,editable
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// fill the blank and fix the error without adding/removing new line
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// Fill the blank and fix the error without adding/removing new line
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struct Person {
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name: String,
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age: u8,
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@ -84,26 +84,26 @@ fn main() {
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age,
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};
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// how can you believe sunface is only 18?
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// How can you believe sunface is only 18?
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p.age = 30;
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// fill the lank
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// Fill the blank
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__ = String::from("sunfei");
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println!("Success!")
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println!("Success!");
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}
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```
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5. π Using *field init shorthand syntax* to reduct repetitions.
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5. π Using *field init shorthand syntax* to reduce repetitions.
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```rust,editable
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// fill the blank
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// Fill the blank
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struct Person {
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name: String,
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age: u8,
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}
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fn main() {
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println!("Success!")
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println!("Success!");
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}
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fn build_person(name: String, age: u8) -> Person {
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@ -117,7 +117,7 @@ fn build_person(name: String, age: u8) -> Person {
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6. π You can create instance from other instance with *struct update syntax*
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```rust,editable
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// fill the blank to make the code work
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// Fill the blank to make the code work
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struct User {
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active: bool,
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username: String,
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@ -134,7 +134,7 @@ fn main() {
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let u2 = set_email(u1);
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println!("Success!")
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println!("Success!");
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}
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fn set_email(u: User) -> User {
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@ -146,11 +146,11 @@ fn set_email(u: User) -> User {
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```
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### Print the structs
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7. ππ We can use `#[derive(Debug)]` to [make a struct prinable](https://doc.rust-lang.org/book/ch05-02-example-structs.html?highlight=%23%5Bderive(Debug)%5D#adding-useful-functionality-with-derived-traits).
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7. ππ We can use `#[derive(Debug)]` to [make a struct printable](https://doc.rust-lang.org/book/ch05-02-example-structs.html?highlight=%23%5Bderive(Debug)%5D#adding-useful-functionality-with-derived-traits).
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```rust,editable
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// fill the blanks to make the code work
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// Fill the blanks to make the code work
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#[__]
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struct Rectangle {
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width: u32,
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@ -160,13 +160,13 @@ struct Rectangle {
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fn main() {
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let scale = 2;
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let rect1 = Rectangle {
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width: dbg!(30 * scale), // print debug info to stderr and assign the value of `30 * scale` to `width`
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width: dbg!(30 * scale), // Print debug info to stderr and assign the value of `30 * scale` to `width`
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height: 50,
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};
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dbg!(&rect1); // print debug info to stderr
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dbg!(&rect1); // Print debug info to stderr
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println!(__, rect1); // print debug info to stdout
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println!(__, rect1); // Print debug info to stdout
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}
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```
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@ -209,7 +209,7 @@ fn main() {
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8. ππ
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```rust,editable
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// fix errors to make it work
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// Fix errors to make it work
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#[derive(Debug)]
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struct File {
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name: String,
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