covered ownership and structs.

the_book/rectangles/Cargo.toml

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+[package]
+name = "rectangles"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

the_book/rectangles/src/main.rs

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+#[derive(Debug)]
+struct Rectangle {
+    width: u32,
+    height: u32,
+}
+
+impl Rectangle {
+    fn area(&self) -> u32 {
+        self.width * self.height
+    }
+    fn can_hold(&self, other: &Rectangle) -> bool {
+        self.width >= other.width && self.height >= other.height
+    }
+    fn square(size: u32)->Rectangle{
+        Rectangle { width: size, height: size }
+    }
+}
+fn main() {
+    let rect1 = Rectangle {
+        width: 30,
+        height: 50,
+    };
+    let rect2 = Rectangle {
+        width: 10,
+        height: 40,
+    };
+    let rect3 = Rectangle {
+        width: 60,
+        height: 45,
+    };
+
+    println!("Can rect1 hold rect2? {}", rect1.can_hold(&rect2));
+    println!("Can rect1 hold rect3? {}", rect1.can_hold(&rect3));
+
+    println!(
+        "The area of the rectangle is {} square pixels.",
+        rect1.area()
+    );
+
+    println!("rect1 is {:?}", &rect1);
+}