update

exercises/clippy/clippy1.rs

@@ -9,12 +9,11 @@
 // Execute `rustlings hint clippy1` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
 
 use std::f32;
 
 fn main() {
-    let pi = 3.14f32;
+    let pi = f32::consts::PI;
     let radius = 5.00f32;
 
     let area = pi * f32::powi(radius, 2);

exercises/clippy/clippy2.rs

@@ -3,12 +3,11 @@
 // Execute `rustlings hint clippy2` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
 
 fn main() {
     let mut res = 42;
     let option = Some(12);
-    for x in option {
+    while let Some(x) = option {
         res += x;
     }
     println!("{}", res);

exercises/clippy/clippy3.rs

@@ -4,28 +4,28 @@
 //
 // Execute `rustlings hint clippy3` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
+
+use std::mem::swap;
 
 #[allow(unused_variables, unused_assignments)]
 fn main() {
     let my_option: Option<()> = None;
     if my_option.is_none() {
-        my_option.unwrap();
+        // my_option.unwrap();
     }
 
     let my_arr = &[
-        -1, -2, -3
+        -1, -2, -3,
         -4, -5, -6
     ];
     println!("My array! Here it is: {:?}", my_arr);
 
-    let my_empty_vec = vec![1, 2, 3, 4, 5].resize(0, 5);
-    println!("This Vec is empty, see? {:?}", my_empty_vec);
+    // let my_empty_vec = 
+    println!("This Vec is empty, see? {:?}", vec![1, 2, 3, 4, 5].resize(0, 5));
 
     let mut value_a = 45;
     let mut value_b = 66;
     // Let's swap these two!
-    value_a = value_b;
-    value_b = value_a;
+    swap(&mut value_a, &mut value_b);
     println!("value a: {}; value b: {}", value_a, value_b);
 }

exercises/conversions/as_ref_mut.rs

@@ -7,25 +7,28 @@
 // Execute `rustlings hint as_ref_mut` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
 
 // Obtain the number of bytes (not characters) in the given argument.
 // TODO: Add the AsRef trait appropriately as a trait bound.
-fn byte_counter<T>(arg: T) -> usize {
+
+use std::ops::Mul;
+
+fn byte_counter<T: AsRef<str>>(arg: T) -> usize {
     arg.as_ref().as_bytes().len()
 }
 
 // Obtain the number of characters (not bytes) in the given argument.
 // TODO: Add the AsRef trait appropriately as a trait bound.
-fn char_counter<T>(arg: T) -> usize {
+fn char_counter<T: AsRef<str>>(arg: T) -> usize {
     arg.as_ref().chars().count()
 }
 
 // Squares a number using as_mut().
 // TODO: Add the appropriate trait bound.
-fn num_sq<T>(arg: &mut T) {
+fn num_sq<T: AsMut<u32>>(arg: &mut T)  {
     // TODO: Implement the function body.
-    ???
+    let value = arg.as_mut();
+    *value *= *value;
 }
 
 #[cfg(test)]

exercises/conversions/from_into.rs

@@ -40,10 +40,38 @@ impl Default for Person {
 // If while parsing the age, something goes wrong, then return the default of
 // Person Otherwise, then return an instantiated Person object with the results
 
-// I AM NOT DONE
 
 impl From<&str> for Person {
     fn from(s: &str) -> Person {
+        // 如果字符串为空，返回默认的 Person
+        if s.is_empty() {
+            return Person::default();
+        }
+
+        // 使用 split_once 分割字符串
+        let (name, age_str) = s.split_once(',').unwrap_or(("", ""));
+
+        // 如果名字为空，返回默认的 Person
+        if name.trim().is_empty() {
+            return Person::default();
+        }
+
+        // 尝试解析年龄，如果失败则返回默认的 Person
+        let age = match age_str.trim().parse::<usize>() {
+            Ok(x) if x < 150 && x > 0 => x,
+            _ => return Person::default()
+        };
+
+        // 检查年龄是否在合理范围内
+        if age > 150 {
+            return Person::default();
+        }
+
+        // 返回解析后的 Person 对象
+        Person {
+            name: name.trim().to_string(),
+            age,
+        }
     }
 }
 

exercises/conversions/from_str.rs

@@ -31,7 +31,6 @@ enum ParsePersonError {
     ParseInt(ParseIntError),
 }
 
-// I AM NOT DONE
 
 // Steps:
 // 1. If the length of the provided string is 0, an error should be returned
@@ -52,6 +51,38 @@ enum ParsePersonError {
 impl FromStr for Person {
     type Err = ParsePersonError;
     fn from_str(s: &str) -> Result<Person, Self::Err> {
+        if s.is_empty() {
+            return Err(ParsePersonError::Empty);
+        }
+
+        let elems: Vec<_> = s.split(',').collect();
+
+        if elems.len() > 2 || elems.len() <= 1 {
+            return Err(ParsePersonError::BadLen);
+        }
+
+        let name = elems[0];
+        let age_str = elems[1];
+
+        // 如果名字为空，返回默认的 Person
+        if name.trim().is_empty() {
+            return Err(ParsePersonError::NoName);
+        }
+
+        // 尝试解析年龄，如果失败则返回默认的 Person
+        let age = age_str.trim().parse::<usize>()
+        .map_err(ParsePersonError::ParseInt)?;
+
+        // 检查年龄是否在合理范围内
+        if age > 150 || age<=0 {
+            return Err(ParsePersonError::BadLen);
+        }
+
+        // 返回解析后的 Person 对象
+        Ok(Person {
+            name: name.trim().to_string(),
+            age,
+        })
     }
 }
 

exercises/conversions/try_from_into.rs

@@ -9,7 +9,9 @@
 // Execute `rustlings hint try_from_into` or use the `hint` watch subcommand for
 // a hint.
 
+use std::array::TryFromSliceError;
 use std::convert::{TryFrom, TryInto};
+use std::num::TryFromIntError;
 
 #[derive(Debug, PartialEq)]
 struct Color {
@@ -27,7 +29,13 @@ enum IntoColorError {
     IntConversion,
 }
 
-// I AM NOT DONE
+impl From<TryFromIntError> for IntoColorError {
+    fn from(err: TryFromIntError) -> Self {
+        IntoColorError::IntConversion
+    }
+}
+
+
 
 // Your task is to complete this implementation and return an Ok result of inner
 // type Color. You need to create an implementation for a tuple of three
@@ -41,20 +49,43 @@ enum IntoColorError {
 impl TryFrom<(i16, i16, i16)> for Color {
     type Error = IntoColorError;
     fn try_from(tuple: (i16, i16, i16)) -> Result<Self, Self::Error> {
+        // let (a,b,c) = tuple;
+        // let red:Result<u8, _> = a.try_into();
+        // let green:Result<u8, _> = b.try_into();
+        // let blue:Result<u8, _> = c.try_into();
+
+        Ok(Color{
+            red: u8::try_from(tuple.0)?,
+            green: u8::try_from(tuple.1)?,
+            blue: u8::try_from(tuple.2)?,
+        })
     }
 }
 
 // Array implementation
 impl TryFrom<[i16; 3]> for Color {
     type Error = IntoColorError;
     fn try_from(arr: [i16; 3]) -> Result<Self, Self::Error> {
+        Ok(Color{
+            red: u8::try_from(arr[0])?,
+            green: u8::try_from(arr[1])?,
+            blue: u8::try_from(arr[2])?,
+        })
     }
 }
 
 // Slice implementation
 impl TryFrom<&[i16]> for Color {
     type Error = IntoColorError;
     fn try_from(slice: &[i16]) -> Result<Self, Self::Error> {
+        if slice.len() != 3 {
+            return Err(IntoColorError::BadLen);
+        }
+        Ok(Color{
+            red: u8::try_from(slice[0])?,
+            green: u8::try_from(slice[1])?,
+            blue: u8::try_from(slice[2])?,
+        })
     }
 }
 

exercises/conversions/using_as.rs

@@ -10,11 +10,9 @@
 // Execute `rustlings hint using_as` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
-
 fn average(values: &[f64]) -> f64 {
     let total = values.iter().sum::<f64>();
-    total / values.len()
+    total / values.len() as f64
 }
 
 fn main() {

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 +10,26 @@ 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);
+    // let your_command = format!(
+    //     "Your command here with {}, please checkout exercises/tests/build.rs",
+    //     timestamp
+    // );
+    // println!("cargo:{}", your_command);
+
+    let command = format!("rustc-env=TEST_FOO={}", timestamp);
+    println!("cargo:{}", command);
+
+    // let command2 = "";
+    // println!("cargo:rustc-cfg=feature=\"pass\"");
+    // println!("cargo:rustc-cfg=feature=\"pass\"");
+    // println!("cargo:rustc-cfg=pass");
+
+
 
     // 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=feature=\"pass\"");
+    // let your_command = "Your command here, please checkout exercises/tests/build.rs";
+    // println!("cargo:{}", your_command);
 }

exercises/tests/tests5.rs

@@ -22,7 +22,6 @@
 // Execute `rustlings hint tests5` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
 
 /// # Safety
 ///
@@ -31,8 +30,9 @@ unsafe fn modify_by_address(address: usize) {
     // TODO: Fill your safety notice of the code block below to match your
     // 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")
+    let ptr = address as *mut u32;
+    if !ptr.is_null() {
+        *ptr = 0xAABBCCDD;  // Modify the u32 value to 0xAABBCCDD
     }
 }
 
@@ -45,7 +45,7 @@ mod tests {
         let mut t: u32 = 0x12345678;
         // SAFETY: The address is guaranteed to be valid and contains
         // a unique reference to a `u32` local variable.
-        unsafe { modify_by_address(&mut t as *mut u32 as usize) };
+        unsafe {modify_by_address(&mut t as *mut u32 as usize);}
         assert!(t == 0xAABBCCDD);
     }
 }

exercises/tests/tests6.rs

@@ -7,7 +7,6 @@
 // Execute `rustlings hint tests6` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
 
 struct Foo {
     a: u128,
@@ -20,8 +19,9 @@ 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.b = Some("hello".to_owned());
+    ret
 }
 
 #[cfg(test)]

exercises/tests/tests7.rs

@@ -34,9 +34,18 @@
 // Execute `rustlings hint tests7` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
 
-fn main() {}
+use core::time;
+
+fn main() {
+    // let timestamp = std::time::SystemTime::now()
+    // .duration_since(std::time::UNIX_EPOCH)
+    // .unwrap()
+    // .as_secs();
+
+    // let command = format!("rustc-env=TEST_FOO={}", timestamp);
+    // println!("cargo:{}", command);
+}
 
 #[cfg(test)]
 mod tests {
@@ -48,6 +57,7 @@ mod tests {
             .duration_since(std::time::UNIX_EPOCH)
             .unwrap()
             .as_secs();
+
         let s = std::env::var("TEST_FOO").unwrap();
         let e: u64 = s.parse().unwrap();
         assert!(timestamp >= e && timestamp < e + 10);