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diff --git a/solutions/22_clippy/clippy1.rs b/solutions/22_clippy/clippy1.rs
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+++ b/solutions/22_clippy/clippy1.rs
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+// 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}");
+}