package main

import "fmt"

type rectangle struct {
	w int
	h int
}

func (r rectangle) area() int {
	return r.w * r.h
}

func (r rectangle) perimeter() int {
	return 2 * (r.w + r.h)
}

func main() {
	r1 := rectangle{w: 3, h: 4}
	r2 := rectangle{w: 10, h: 2}

	fmt.Println(r1.area())      // 12
	fmt.Println(r1.perimeter()) // 14
	fmt.Println(r2.area())      // 20
	fmt.Println(r2.perimeter()) // 24
}