clippy1 solution

exercises/22_clippy/clippy1.rs

@@ -1,19 +1,17 @@
 // The Clippy tool is a collection of lints to analyze your code so you can
 // catch common mistakes and improve your Rust code.
 //
-// For these exercises the code will fail to compile when there are Clippy
+// For these exercises, the code will fail to compile when there are Clippy
 // warnings. Check Clippy's suggestions from the output to solve the exercise.
 
-use std::f32;
+use std::f32::consts::PI;
 
 fn main() {
-    let pi = 3.14f32;
+    // Use the more accurate `PI` constant.
-    let radius = 5.00f32;
+    let pi = PI;
+    let radius: f32 = 5.0;
 
-    let area = pi * f32::powi(radius, 2);
+    let area = pi * radius.powi(2);
 
-    println!(
+    println!("The area of a circle with radius {radius:.2} is {area:.5}");
-        "The area of a circle with radius {:.2} is {:.5}!",
-        radius, area
-    )
 }

rustlings-macros/info.toml

@@ -1134,7 +1134,7 @@ dir = "22_clippy"
 test = false
 strict_clippy = true
 hint = """
-Rust stores the highest precision version of any long or infinite precision
+Rust stores the highest precision version of some long or infinite precision
 mathematical constants in the Rust standard library:
 https://doc.rust-lang.org/stable/std/f32/consts/index.html
 
@@ -1142,7 +1142,7 @@ We may be tempted to use our own approximations for certain mathematical
 constants, but clippy recognizes those imprecise mathematical constants as a
 source of potential error.
 
-See the suggestions of the clippy warning in compile output and use the
+See the suggestions of the Clippy warning in the compile output and use the
 appropriate replacement constant from `std::f32::consts`..."""
 
 [[exercises]]

solutions/22_clippy/clippy1.rs

@@ -1 +1,17 @@
-// Solutions will be available before the stable release. Thank you for testing the beta version 🥰
+// The Clippy tool is a collection of lints to analyze your code so you can
+// catch common mistakes and improve your Rust code.
+//
+// For these exercises, the code will fail to compile when there are Clippy
+// warnings. Check Clippy's suggestions from the output to solve the exercise.
+
+use std::f32::consts::PI;
+
+fn main() {
+    // Use the more accurate `PI` constant.
+    let pi = PI;
+    let radius: f32 = 5.0;
+
+    let area = pi * radius.powi(2);
+
+    println!("The area of a circle with radius {radius:.2} is {area:.5}");
+}