exercise 1

• Create a Shape enum with the following variants:

  • Circle(f32): represents a circle with a given radius
  • Rectangle(f32, f32): represents a rectangle with given width and height
  • Triangle(f32, f32, f32): represents a triangle with given side lengths
  • Implement a perimeter method for the Shape enum that calculates and returns the perimeter of the shape. The perimeter of a circle is its circumference, and the perimeter of a - rectangle is twice the sum of its width and height. The perimeter of a triangle is the sum of its three sides.

Once you've implemented the perimeter method, create instances of each variant of the Shape enum and call the perimeter method on them.

use std::f32::consts::PI;

enum Shape {
    Circle(f32),
    Rectangle(f32,f32),
    Triangle(f32,f32,f32)
}


impl Shape {
    fn perimeter(&self){
        match self {
            Shape::Circle(x) =>  println!("{}" ,2.0 * x * PI) ,
            Shape::Rectangle(x,y ) => println!( "{}" ,2.0 * (x + y)) ,
            Shape::Triangle(x,y ,z ) => println!("{}" ,x + y + z)
        }
    }
}

fn main(){

    let circle = Shape::Circle(5.0);
    let rectangle = Shape::Rectangle(3.0 , 4.0);
    let triangle = Shape::Triangle(5.0 , 6.0 , 7.0);

    circle.perimeter();
    rectangle.perimeter();
    triangle.perimeter();

}