feat: begin chapter 2HEADmaster

1 files changed, 20 insertions, 0 deletions

diff --git a/02/circumference.rs b/02/circumference.rs
new file mode 100644
index 0000000..a27da44
--- /dev/null
+++ b/02/circumference.rs
@@ -0,0 +1,20 @@
+use std::f64::consts::PI;
+use std::io::stdin;
+
+/// Calculate the area and circumference of a circle from its radius.
+/// 1. Prompt for a radius input.
+/// 2. Parse the input into a numeric radius.
+/// 3. Apply the area and circumference formulas.
+/// 4. Print out the results.
+fn main() {
+    let mut input = String::new();
+    println!("Enter the radius of your circle: ");
+    stdin().read_line(&mut input).expect("No radius given.");
+
+    let radius: f64 = input.trim().parse().expect("Invalid radius given.");
+
+    let circumference = 2.0 * PI * radius;
+    let area = PI * radius.powi(2);
+
+    println!("The circumference is: {circumference}, and the area is: {area}.");
+}