update

exercises/iterators/iterators1.rs

@@ -9,17 +9,17 @@
 // Execute `rustlings hint iterators1` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
+
 
 fn main() {
     let my_fav_fruits = vec!["banana", "custard apple", "avocado", "peach", "raspberry"];
 
-    let mut my_iterable_fav_fruits = ???;   // TODO: Step 1
+    let mut my_iterable_fav_fruits = my_fav_fruits.iter();   // TODO: Step 1
 
     assert_eq!(my_iterable_fav_fruits.next(), Some(&"banana"));
-    assert_eq!(my_iterable_fav_fruits.next(), ???);     // TODO: Step 2
+    assert_eq!(my_iterable_fav_fruits.next(), Some(&"custard apple"));     // TODO: Step 2
     assert_eq!(my_iterable_fav_fruits.next(), Some(&"avocado"));
-    assert_eq!(my_iterable_fav_fruits.next(), ???);     // TODO: Step 3
+    assert_eq!(my_iterable_fav_fruits.next(), Some(&"peach"));     // TODO: Step 3
     assert_eq!(my_iterable_fav_fruits.next(), Some(&"raspberry"));
-    assert_eq!(my_iterable_fav_fruits.next(), ???);     // TODO: Step 4
+    assert_eq!(my_iterable_fav_fruits.next(), None);     // TODO: Step 4
 }

exercises/iterators/iterators2.rs

@@ -14,7 +14,7 @@
 pub fn capitalize_first(input: &str) -> String {
     let mut c = input.chars();
     match c.next() {
-        None => String::new(),
+        None => String::new(), 
         Some(first) => ???,
     }
 }

exercises/tests/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "tests8"
+version = "0.0.1"
+edition = "2021"
+[[bin]]
+name = "tests8"
+path = "tests8.rs"

exercises/tests/build.rs

@@ -10,15 +10,10 @@ fn main() {
         .duration_since(std::time::UNIX_EPOCH)
         .unwrap()
         .as_secs(); // What's the use of this timestamp here?
-    let your_command = format!(
-        "Your command here with {}, please checkout exercises/tests/build.rs",
-        timestamp
-    );
-    println!("cargo:{}", your_command);
+    println!("cargo:rustc-env=TEST_FOO={}", timestamp);
 
     // In tests8, we should enable "pass" feature to make the
     // testcase return early. Fill in the command to tell
     // Cargo about that.
-    let your_command = "Your command here, please checkout exercises/tests/build.rs";
-    println!("cargo:{}", your_command);
+    println!("cargo:rustc-cfg=pass");
 }

exercises/tests/tests1.rs

@@ -10,12 +10,12 @@
 // Execute `rustlings hint tests1` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
+
 
 #[cfg(test)]
 mod tests {
     #[test]
     fn you_can_assert() {
-        assert!();
+        assert!(true);
     }
 }

exercises/tests/tests2.rs

@@ -6,12 +6,12 @@
 // Execute `rustlings hint tests2` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
+
 
 #[cfg(test)]
 mod tests {
     #[test]
     fn you_can_assert_eq() {
-        assert_eq!();
+        assert_eq!(true, true);
     }
 }

exercises/tests/tests3.rs

@@ -7,7 +7,7 @@
 // Execute `rustlings hint tests3` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
+
 
 pub fn is_even(num: i32) -> bool {
     num % 2 == 0
@@ -19,11 +19,11 @@ mod tests {
 
     #[test]
     fn is_true_when_even() {
-        assert!();
+        assert!(is_even(4), "Expected 4 to be even");
     }
 
     #[test]
     fn is_false_when_odd() {
-        assert!();
+        assert!(!is_even(5),"Expected 5 to be odd");
     }
 }

exercises/tests/tests4.rs

@@ -5,7 +5,7 @@
 // Execute `rustlings hint tests4` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
+
 
 struct Rectangle {
     width: i32,
@@ -30,17 +30,19 @@ mod tests {
     fn correct_width_and_height() {
         // This test should check if the rectangle is the size that we pass into its constructor
         let rect = Rectangle::new(10, 20);
-        assert_eq!(???, 10); // check width
-        assert_eq!(???, 20); // check height
+        assert_eq!(rect.width, 10); // check width
+        assert_eq!(rect.height, 20); // check height
     }
 
     #[test]
+    #[should_panic]
     fn negative_width() {
         // This test should check if program panics when we try to create rectangle with negative width
         let _rect = Rectangle::new(-10, 10);
     }
 
     #[test]
+    #[should_panic]
     fn negative_height() {
         // This test should check if program panics when we try to create rectangle with negative height
         let _rect = Rectangle::new(10, -10);

exercises/tests/tests5.rs

@@ -22,7 +22,7 @@
 // Execute `rustlings hint tests5` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
+
 
 /// # Safety
 ///
@@ -32,7 +32,10 @@ unsafe fn modify_by_address(address: usize) {
     // code's behavior and the contract of this function. You may use the
     // comment of the test below as your format reference.
     unsafe {
-        todo!("Your code goes here")
+        // 将 `usize` 地址转换为 `*mut u32` 类型的原始指针
+        let ptr = address as *mut u32;
+        // 解引用指针并修改其值
+        *ptr = 0xAABBCCDD;
     }
 }
 

exercises/tests/tests6.rs

@@ -7,7 +7,7 @@
 // Execute `rustlings hint tests6` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
+
 
 struct Foo {
     a: u128,
@@ -20,8 +20,8 @@ struct Foo {
 unsafe fn raw_pointer_to_box(ptr: *mut Foo) -> Box<Foo> {
     // SAFETY: The `ptr` contains an owned box of `Foo` by contract. We
     // simply reconstruct the box from that pointer.
-    let mut ret: Box<Foo> = unsafe { ??? };
-    todo!("The rest of the code goes here")
+    let mut ret: Box<Foo> = unsafe { Box::from_raw(ptr) };
+    ret
 }
 
 #[cfg(test)]
@@ -31,7 +31,7 @@ mod tests {
 
     #[test]
     fn test_success() {
-        let data = Box::new(Foo { a: 1, b: None });
+        let data = Box::new(Foo { a: 1, b: Some("hello".to_owned()) });
 
         let ptr_1 = &data.a as *const u128 as usize;
         // SAFETY: We pass an owned box of `Foo`.

exercises/tests/tests7.rs

@@ -34,7 +34,7 @@
 // Execute `rustlings hint tests7` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
+
 
 fn main() {}
 

exercises/tests/tests8.rs

@@ -7,7 +7,7 @@
 // Execute `rustlings hint tests8` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
+
 
 fn main() {}
 
@@ -17,9 +17,10 @@ mod tests {
 
     #[test]
     fn test_success() {
-        #[cfg(feature = "pass")]
+        #[cfg(pass)]
         return;
 
+        #[cfg(not(pass))]
         panic!("no cfg set");
     }
 }