add solutions for ownership.md
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1.
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```rust
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fn main() {
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let x = String::from("hello, world");
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let y = x.clone();
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println!("{},{}",x,y);
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}
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```
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```rust
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fn main() {
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let x = "hello, world";
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let y = x;
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println!("{},{}",x,y);
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}
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```
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```rust
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fn main() {
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let x = &String::from("hello, world");
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let y = x;
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println!("{},{}",x,y);
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}
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```
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```rust
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fn main() {
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let x = 10;
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let y = x;
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println!("{},{}",x,y);
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}
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```
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2.
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```rust
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// Don't modify code in main!
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fn main() {
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let s1 = String::from("hello, world");
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let s2 = take_ownership(s1);
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println!("{}", s2);
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}
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// Only modify the code below!
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fn take_ownership(s: String) -> String {
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println!("{}", s);
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s
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}
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```
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3.
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```rust
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fn main() {
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let s = give_ownership();
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println!("{}", s);
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}
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// Only modify the code below!
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fn give_ownership() -> String {
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let s = String::from("hello, world");
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// convert String to Vec
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let _s = s.as_bytes();
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s
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}
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```
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```rust
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fn main() {
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let s = give_ownership();
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println!("{}", s);
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}
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// Only modify the code below!
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fn give_ownership() -> String {
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let s = String::from("hello, world");
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s
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}
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```
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4.
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```rust
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fn main() {
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let s = String::from("hello, world");
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print_str(s.clone());
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println!("{}", s);
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}
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fn print_str(s: String) {
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println!("{}",s)
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}
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```
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5.
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```rust
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fn main() {
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let x = (1, 2, (), "hello");
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let y = x;
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println!("{:?}, {:?}", x, y);
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}
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```
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6.
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```rust
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fn main() {
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let s = String::from("hello, ");
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// modify this line only !
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let mut s1 = s;
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s1.push_str("world")
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}
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```
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7.
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```rust
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fn main() {
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let x = Box::new(5);
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let mut y = Box::new(3); // implement this line, dont change other lines!
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*y = 4;
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assert_eq!(*x, 5);
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}
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```
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8.
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```rust
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fn main() {
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let t = (String::from("hello"), String::from("world"));
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let _s = t.0;
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// modify this line only, don't use `_s`
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println!("{:?}", t.1);
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}
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```
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9.
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```rust
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fn main() {
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let t = (String::from("hello"), String::from("world"));
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// fill the blanks
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let (s1, s2) = t.clone();
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println!("{:?}, {:?}, {:?}", s1, s2, t); // -> "hello", "world", ("hello", "world")
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}
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```
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@ -1,17 +1,17 @@
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# Ownership
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# Ownership
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🌟🌟
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1. 🌟🌟
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```rust,editable
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```rust,editable
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fn main() {
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fn main() {
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// modify this line only! use as many approaches as you can
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// use as many approaches as you can to make it work
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let x = String::from("hello, world");
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let x = String::from("hello, world");
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let y = x;
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let y = x;
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println!("{},{}",x,y);
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println!("{},{}",x,y);
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}
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}
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```
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```
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🌟🌟
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2. 🌟🌟
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```rust,editable
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```rust,editable
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// Don't modify code in main!
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// Don't modify code in main!
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fn main() {
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fn main() {
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@ -28,7 +28,7 @@ fn take_ownership(s: String) {
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```
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```
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🌟🌟
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3. 🌟🌟
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```rust,editable
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```rust,editable
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fn main() {
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fn main() {
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@ -45,9 +45,9 @@ fn give_ownership() -> String {
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}
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}
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```
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```
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🌟🌟
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4. 🌟🌟
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```rust,editable
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```rust,editable
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// use clone to fix it
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// fix the error without removing code line
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fn main() {
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fn main() {
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let s = String::from("hello, world");
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let s = String::from("hello, world");
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@ -61,11 +61,11 @@ fn print_str(s: String) {
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}
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}
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```
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```
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🌟🌟
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5. 🌟🌟
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```rust, editable
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```rust, editable
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// don't use clone ,use copy instead
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// don't use clone ,use copy instead
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fn main() {
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fn main() {
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let x = (1, 2, (), "hello");
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let x = (1, 2, (), "hello".to_string());
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let y = x.clone();
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let y = x.clone();
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println!("{:?}, {:?}", x, y);
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println!("{:?}, {:?}", x, y);
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}
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}
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@ -74,7 +74,7 @@ fn main() {
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#### Mutability
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#### Mutability
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Mutability can be changed when ownership is transferred.
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Mutability can be changed when ownership is transferred.
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🌟
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6. 🌟
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```rust,editable
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```rust,editable
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fn main() {
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fn main() {
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@ -87,7 +87,7 @@ fn main() {
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}
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}
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```
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```
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🌟🌟🌟
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7. 🌟🌟🌟
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```rust,editable
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```rust,editable
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fn main() {
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fn main() {
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@ -136,7 +136,7 @@ fn main() {
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#### Exercises
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#### Exercises
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🌟
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8. 🌟
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```rust,editable
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```rust,editable
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fn main() {
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fn main() {
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@ -149,16 +149,16 @@ fn main() {
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}
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}
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```
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```
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🌟🌟
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9. 🌟🌟
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```rust,editable
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```rust,editable
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fn main() {
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fn main() {
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let t = (String::from("hello"), String::from("world"));
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let t = (String::from("hello"), String::from("world"));
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// fill the blanks
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// fill the blanks
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let (__, __) = t;
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let (__, __) = __;
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println!("{:?}, {:?}, {:?}", s1, s2, t);
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println!("{:?}, {:?}, {:?}", s1, s2, t); // -> "hello", "world", ("hello", "world")
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}
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}
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```
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```
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```rust,editable
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```rust,editable
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fn main() {
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fn main() {
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// 只能修改下面这行代码! 使用尽可能多的方法来通过编译
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// 使用尽可能多的方法来通过编译
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let x = String::from("hello, world");
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let x = String::from("hello, world");
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let y = x;
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let y = x;
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println!("{},{}",x,y);
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println!("{},{}",x,y);
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@ -48,7 +48,7 @@ fn give_ownership() -> String {
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🌟🌟
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🌟🌟
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```rust,editable
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```rust,editable
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// 使用 clone 来让代码通过编译
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// 修复错误,不要删除任何代码行
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fn main() {
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fn main() {
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let s = String::from("hello, world");
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let s = String::from("hello, world");
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@ -66,7 +66,7 @@ fn print_str(s: String) {
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```rust, editable
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```rust, editable
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// 不要使用 clone,使用 copy 的方式替代
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// 不要使用 clone,使用 copy 的方式替代
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fn main() {
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fn main() {
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let x = (1, 2, (), "hello");
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let x = (1, 2, (), "hello".to_string());
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let y = x.clone();
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let y = x.clone();
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println!("{:?}, {:?}", x, y);
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println!("{:?}, {:?}", x, y);
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}
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}
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@ -160,9 +160,9 @@ fn main() {
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let t = (String::from("hello"), String::from("world"));
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let t = (String::from("hello"), String::from("world"));
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// 填空,不要修改其它代码
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// 填空,不要修改其它代码
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let (__, __) = t;
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let (__, __) = __;
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println!("{:?}, {:?}, {:?}", s1, s2, t);
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println!("{:?}, {:?}, {:?}", s1, s2, t); // -> "hello", "world", ("hello", "world")
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}
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}
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```
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```
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