1 struct Rectangle {
   2     width: u32,
   3     height: u32,
   4 }
   5 
   6 fn main() {
   7     let rect1 = Rectangle { width: 30, height: 50 };
   8 
   9     println!(
  10         "The perimeter of the rectangle is {} pixels.",
  11         perimeter(&rect1)
  12     );
  13 }
  14 
  15 fn area(rectangle: &Rectangle) -> u32 {
  16     rectangle.width * rectangle.height
  17 }
  18 
  19 fn perimeter(rectangle: &Rectangle) -> u32 {
  20     (rectangle.width + rectangle.height) * 2
  21 }