4.23.5 abstraction

package main

import "fmt"

// Shape is an interface that defines the basic methods for a shape.
type Shape interface {
	Area() float64
	Perimeter() float64
}

// Rectangle is a struct that implements the Shape interface.
type Rectangle struct {
	width, height float64
}

// Area returns the area of the rectangle.
func (r Rectangle) Area() float64 {
	return r.width * r.height
}

// Perimeter returns the perimeter of the rectangle.
func (r Rectangle) Perimeter() float64 {
	return 2 * (r.width + r.height)
}

// Circle is a struct that implements the Shape interface.
type Circle struct {
	radius float64
}

// Area returns the area of the circle.
func (c Circle) Area() float64 {
	return 3.14 * c.radius * c.radius
}

// Perimeter returns the perimeter of the circle.
func (c Circle) Perimeter() float64 {
	return 2 * 3.14 * c.radius
}

func main() {
	// Create a rectangle and a circle.
	r := Rectangle{width: 10, height: 20}
	c := Circle{radius: 5}

	// Declare a slice of Shape interfaces.
	shapes := []Shape{r, c}

	// Iterate over the shapes and print their area and perimeter.
	for _, shape := range shapes {
		fmt.Println("Area:", shape.Area())
		fmt.Println("Perimeter:", shape.Perimeter())
		fmt.Println("")
	}
}

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